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-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/alibuild/default.nix24
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/apache-ant/1.9.nix112
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/apache-ant/default.nix112
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/apache-maven/builder.sh18
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/apache-maven/default.nix28
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/arpa2cm/default.nix21
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bam/default.nix39
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/bash-tools-test.nix44
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/bazel-remote/default.nix92
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/bazel-remote/disable_build_file_generation.patch24
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_0_26/default.nix390
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_0_26/glibc.patch78
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_0_26/python-stub-path-fix.patch13
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_0_29/default.nix564
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_0_29/glibc.patch78
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_0_29/src-deps.json506
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_1/default.nix565
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_1/glibc.patch78
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_1/src-deps.json506
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_3/default.nix622
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_3/no-arc.patch34
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_3/src-deps.json861
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_4/default.nix654
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_4/no-arc.patch34
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_4/src-deps.json1498
-rwxr-xr-xnixpkgs/pkgs/development/tools/build-managers/bazel/bazel_4/update-srcDeps.py54
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_rc.patch13
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/buildtools/default.nix28
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/buildtools/deps.nix20
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/cpp-test.nix51
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/java-test.nix58
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/nix-hacks.patch43
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/protobuf-test.nix176
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/python-bin-path-test.nix53
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/shebang-test.nix49
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/strict_action_env.patch13
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bazel/trim-last-argument-to-gcc-if-empty.patch37
-rwxr-xr-xnixpkgs/pkgs/development/tools/build-managers/bazel/update-srcDeps.py62
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bear/default.nix66
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bear/no-double-relative.patch14
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bloop/default.nix92
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bmake/bootstrap-fix.patch10
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bmake/default.nix28
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/bmake/fix-unexport-env-test.patch13
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/boot/builder.sh13
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/boot/default.nix25
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/buck/default.nix43
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/buck/pex-mtime.patch13
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/cmake/2.8.nix87
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/cmake/3.2.2-cygwin.patch274
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/cmake/application-services.patch45
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/cmake/default.nix132
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/cmake/libuv-application-services.patch55
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/cmake/search-path-2.8.patch92
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/cmake/search-path.patch74
-rwxr-xr-xnixpkgs/pkgs/development/tools/build-managers/cmake/setup-hook.sh175
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/colormake/default.nix28
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/conan/default.nix112
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/corrosion/cmake-install-full-dir.patch18
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/corrosion/default.nix54
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/drake/Gemfile2
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/drake/Gemfile.lock15
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/drake/default.nix17
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/drake/gemset.nix23
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/dub/default.nix155
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/fac/cargo-lock.patch802
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/fac/default.nix50
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/gn/default.nix64
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/gn/setup-hook.sh14
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/gnumake/4.2/default.nix63
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/gnumake/4.2/glibc-2.27-glob.patch32
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/gnumake/4.2/impure-dirs.patch34
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/gnumake/4.2/pselect.patch170
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/gnumake/default.nix59
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/gnumake/impure-dirs.patch25
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/gradle/default.nix90
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/gup/default.nix42
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/icmake/default.nix46
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/jam/default.nix36
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/kati/default.nix27
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/kati/version.patch19
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/leiningen/default.nix53
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/mage/default.nix31
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/meson/allow-dirs-outside-of-prefix.patch19
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/meson/boost-Do-not-add-system-paths-on-nix.patch40
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/meson/clear-old-rpath.patch20
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/meson/default.nix95
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/meson/fix-rpath.patch24
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/meson/gir-fallback-path.patch16
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/meson/more-env-vars.patch13
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/meson/setup-hook.sh37
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/mill/default.nix42
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/mk/builder.sh4
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/mk/default.nix14
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/msbuild/default.nix133
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/msbuild/nuget.nix1130
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/ninja/default.nix49
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/ninja/setup-hook.sh78
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/pants/default.nix41
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/qbs/default.nix32
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/rake/Gemfile2
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/rake/Gemfile.lock13
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/rake/default.nix17
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/rake/gemset.nix12
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/rebar/default.nix42
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/rebar3/default.nix137
-rwxr-xr-xnixpkgs/pkgs/development/tools/build-managers/rebar3/rebar3-nix-bootstrap267
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/redo-apenwarr/default.nix73
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/redo-c/Makefile10
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/redo-c/default.nix24
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/redo-sh/default.nix31
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/redo/default.nix28
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/remake/default.nix27
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/remake/glibc-2.27-glob.patch34
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/rocm-cmake/default.nix23
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/samurai/default.nix23
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/sbt-extras/default.nix77
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/sbt/default.nix46
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/sbt/scala-native.nix18
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/scons/common.nix48
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/scons/default.nix18
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/scons/setup-hook.sh84
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/shards/default.nix53
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/shards/shards.nix8
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/tup/default.nix55
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/tup/setup-hook.sh44
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/waf/default.nix39
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/wafHook/default.nix9
-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/wafHook/setup-hook.sh75
129 files changed, 14108 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/development/tools/build-managers/alibuild/default.nix b/nixpkgs/pkgs/development/tools/build-managers/alibuild/default.nix
new file mode 100644
index 000000000000..ad9813cde6fb
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/alibuild/default.nix
@@ -0,0 +1,24 @@
+{ lib, python}:
+
+python.pkgs.buildPythonApplication rec {
+  pname = "alibuild";
+  version = "1.5.5";
+
+  src = python.pkgs.fetchPypi {
+    inherit pname version;
+    sha256 = "1sh02avpab4qlyin3p928xw91l4fgs8x5x2rzl623ayqsnfjv19j";
+  };
+
+  doCheck = false;
+  propagatedBuildInputs = [
+    python.pkgs.requests
+    python.pkgs.pyyaml
+  ];
+
+  meta = with lib; {
+    homepage = "https://alisw.github.io/alibuild/";
+    description = "Build tool for ALICE experiment software";
+    license = licenses.gpl3;
+    maintainers = with maintainers; [ ktf ];
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/apache-ant/1.9.nix b/nixpkgs/pkgs/development/tools/build-managers/apache-ant/1.9.nix
new file mode 100644
index 000000000000..93644caa5a4e
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/apache-ant/1.9.nix
@@ -0,0 +1,112 @@
+{ fetchurl, lib, stdenv, coreutils, makeWrapper }:
+
+let version = "1.9.15"; in
+
+stdenv.mkDerivation {
+  pname = "ant";
+  inherit version;
+
+  nativeBuildInputs = [ makeWrapper ];
+
+  src = fetchurl {
+    url = "mirror://apache/ant/binaries/apache-ant-${version}-bin.tar.bz2";
+    sha256 = "0yfx5qsvrg12lar4908ndbnlpppy7g7qk8ay41y4sz9g873v07mr";
+  };
+
+  contrib = fetchurl {
+    url = "mirror://sourceforge/ant-contrib/ant-contrib-1.0b3-bin.tar.bz2";
+    sha256 = "96effcca2581c1ab42a4828c770b48d54852edf9e71cefc9ed2ffd6590571ad1";
+  };
+
+  installPhase =
+    ''
+      mkdir -p $out/bin $out/lib/ant
+      mv * $out/lib/ant/
+
+      # Get rid of the manual (35 MiB).  Maybe we should put this in a
+      # separate output.  Keep the antRun script since it's vanilla sh
+      # and needed for the <exec/> task (but since we set ANT_HOME to
+      # a weird value, we have to move antRun to a weird location).
+      # Get rid of the other Ant scripts since we provide our own.
+      mv $out/lib/ant/bin/antRun $out/bin/
+      rm -rf $out/lib/ant/{manual,bin,WHATSNEW}
+      mkdir $out/lib/ant/bin
+      mv $out/bin/antRun $out/lib/ant/bin/
+
+      # Install ant-contrib.
+      unpackFile $contrib
+      cp -p ant-contrib/ant-contrib-*.jar $out/lib/ant/lib/
+
+      cat >> $out/bin/ant <<EOF
+      #! ${stdenv.shell} -e
+
+      ANT_HOME=$out/lib/ant
+
+      # Find the JDK by looking for javac.  As a fall-back, find the
+      # JRE by looking for java.  The latter allows just the JRE to be
+      # used with (say) ECJ as the compiler.  Finally, allow the GNU
+      # JVM.
+      if [ -z "\''${JAVA_HOME-}" ]; then
+          for i in javac java gij; do
+              if p="\$(type -p \$i)"; then
+                  export JAVA_HOME="\$(${coreutils}/bin/dirname \$(${coreutils}/bin/dirname \$(${coreutils}/bin/readlink -f \$p)))"
+                  break
+              fi
+          done
+          if [ -z "\''${JAVA_HOME-}" ]; then
+              echo "\$0: cannot find the JDK or JRE" >&2
+              exit 1
+          fi
+      fi
+
+      if [ -z \$NIX_JVM ]; then
+          if [ -e \$JAVA_HOME/bin/java ]; then
+              NIX_JVM=\$JAVA_HOME/bin/java
+          elif [ -e \$JAVA_HOME/bin/gij ]; then
+              NIX_JVM=\$JAVA_HOME/bin/gij
+          else
+              NIX_JVM=java
+          fi
+      fi
+
+      LOCALCLASSPATH="\$ANT_HOME/lib/ant-launcher.jar\''${LOCALCLASSPATH:+:}\$LOCALCLASSPATH"
+
+      exec \$NIX_JVM \$NIX_ANT_OPTS \$ANT_OPTS -classpath "\$LOCALCLASSPATH" \
+          -Dant.home=\$ANT_HOME -Dant.library.dir="\$ANT_LIB" \
+          org.apache.tools.ant.launch.Launcher \$NIX_ANT_ARGS \$ANT_ARGS \
+          -cp "\$CLASSPATH" "\$@"
+      EOF
+
+      chmod +x $out/bin/ant
+    ''; # */
+
+  meta = {
+    homepage = "http://ant.apache.org/";
+    description = "A Java-based build tool";
+
+    longDescription = ''
+      Apache Ant is a Java-based build tool.  In theory, it is kind of like
+      Make, but without Make's wrinkles.
+
+      Why another build tool when there is already make, gnumake, nmake, jam,
+      and others? Because all those tools have limitations that Ant's
+      original author couldn't live with when developing software across
+      multiple platforms.  Make-like tools are inherently shell-based -- they
+      evaluate a set of dependencies, then execute commands not unlike what
+      you would issue in a shell.  This means that you can easily extend
+      these tools by using or writing any program for the OS that you are
+      working on.  However, this also means that you limit yourself to the
+      OS, or at least the OS type such as Unix, that you are working on.
+
+      Ant is different.  Instead of a model where it is extended with
+      shell-based commands, Ant is extended using Java classes.  Instead of
+      writing shell commands, the configuration files are XML-based, calling
+      out a target tree where various tasks get executed.  Each task is run
+      by an object that implements a particular Task interface.
+    '';
+
+    license = lib.licenses.asl20;
+    maintainers = [ lib.maintainers.eelco ];
+    platforms = lib.platforms.all;
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/apache-ant/default.nix b/nixpkgs/pkgs/development/tools/build-managers/apache-ant/default.nix
new file mode 100644
index 000000000000..d2ef8361ec0e
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/apache-ant/default.nix
@@ -0,0 +1,112 @@
+{ fetchurl, lib, stdenv, coreutils, makeWrapper }:
+
+let version = "1.10.9"; in
+
+stdenv.mkDerivation {
+  pname = "ant";
+  inherit version;
+
+  nativeBuildInputs = [ makeWrapper ];
+
+  src = fetchurl {
+    url = "mirror://apache/ant/binaries/apache-ant-${version}-bin.tar.bz2";
+    sha256 = "1ab8ybczvk12501dnj450a3d4v43ca0pjhk33s175hax46s58z47";
+  };
+
+  contrib = fetchurl {
+    url = "mirror://sourceforge/ant-contrib/ant-contrib-1.0b3-bin.tar.bz2";
+    sha256 = "1l8say86bz9gxp4yy777z7nm4j6m905pg342li1aphc14p5grvwn";
+  };
+
+  installPhase =
+    ''
+      mkdir -p $out/bin $out/lib/ant
+      mv * $out/lib/ant/
+
+      # Get rid of the manual (35 MiB).  Maybe we should put this in a
+      # separate output.  Keep the antRun script since it's vanilla sh
+      # and needed for the <exec/> task (but since we set ANT_HOME to
+      # a weird value, we have to move antRun to a weird location).
+      # Get rid of the other Ant scripts since we provide our own.
+      mv $out/lib/ant/bin/antRun $out/bin/
+      rm -rf $out/lib/ant/{manual,bin,WHATSNEW}
+      mkdir $out/lib/ant/bin
+      mv $out/bin/antRun $out/lib/ant/bin/
+
+      # Install ant-contrib.
+      unpackFile $contrib
+      cp -p ant-contrib/ant-contrib-*.jar $out/lib/ant/lib/
+
+      cat >> $out/bin/ant <<EOF
+      #! ${stdenv.shell} -e
+
+      ANT_HOME=$out/lib/ant
+
+      # Find the JDK by looking for javac.  As a fall-back, find the
+      # JRE by looking for java.  The latter allows just the JRE to be
+      # used with (say) ECJ as the compiler.  Finally, allow the GNU
+      # JVM.
+      if [ -z "\''${JAVA_HOME-}" ]; then
+          for i in javac java gij; do
+              if p="\$(type -p \$i)"; then
+                  export JAVA_HOME="\$(${coreutils}/bin/dirname \$(${coreutils}/bin/dirname \$(${coreutils}/bin/readlink -f \$p)))"
+                  break
+              fi
+          done
+          if [ -z "\''${JAVA_HOME-}" ]; then
+              echo "\$0: cannot find the JDK or JRE" >&2
+              exit 1
+          fi
+      fi
+
+      if [ -z \$NIX_JVM ]; then
+          if [ -e \$JAVA_HOME/bin/java ]; then
+              NIX_JVM=\$JAVA_HOME/bin/java
+          elif [ -e \$JAVA_HOME/bin/gij ]; then
+              NIX_JVM=\$JAVA_HOME/bin/gij
+          else
+              NIX_JVM=java
+          fi
+      fi
+
+      LOCALCLASSPATH="\$ANT_HOME/lib/ant-launcher.jar\''${LOCALCLASSPATH:+:}\$LOCALCLASSPATH"
+
+      exec \$NIX_JVM \$NIX_ANT_OPTS \$ANT_OPTS -classpath "\$LOCALCLASSPATH" \
+          -Dant.home=\$ANT_HOME -Dant.library.dir="\$ANT_LIB" \
+          org.apache.tools.ant.launch.Launcher \$NIX_ANT_ARGS \$ANT_ARGS \
+          -cp "\$CLASSPATH" "\$@"
+      EOF
+
+      chmod +x $out/bin/ant
+    ''; # */
+
+  meta = {
+    homepage = "http://ant.apache.org/";
+    description = "A Java-based build tool";
+
+    longDescription = ''
+      Apache Ant is a Java-based build tool.  In theory, it is kind of like
+      Make, but without Make's wrinkles.
+
+      Why another build tool when there is already make, gnumake, nmake, jam,
+      and others? Because all those tools have limitations that Ant's
+      original author couldn't live with when developing software across
+      multiple platforms.  Make-like tools are inherently shell-based -- they
+      evaluate a set of dependencies, then execute commands not unlike what
+      you would issue in a shell.  This means that you can easily extend
+      these tools by using or writing any program for the OS that you are
+      working on.  However, this also means that you limit yourself to the
+      OS, or at least the OS type such as Unix, that you are working on.
+
+      Ant is different.  Instead of a model where it is extended with
+      shell-based commands, Ant is extended using Java classes.  Instead of
+      writing shell commands, the configuration files are XML-based, calling
+      out a target tree where various tasks get executed.  Each task is run
+      by an object that implements a particular Task interface.
+    '';
+
+    license = lib.licenses.asl20;
+    maintainers = [ lib.maintainers.eelco ];
+    platforms = lib.platforms.all;
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/apache-maven/builder.sh b/nixpkgs/pkgs/development/tools/build-managers/apache-maven/builder.sh
new file mode 100644
index 000000000000..dcc38b9ec74a
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/apache-maven/builder.sh
@@ -0,0 +1,18 @@
+source $stdenv/setup
+
+unpackPhase
+
+mkdir -p $out/maven
+cp -r $name/* $out/maven
+
+makeWrapper $out/maven/bin/mvn $out/bin/mvn --set-default JAVA_HOME "$jdk"
+makeWrapper $out/maven/bin/mvnDebug $out/bin/mvnDebug --set-default JAVA_HOME "$jdk"
+
+# Add the maven-axis and JIRA plugin by default when using maven 1.x
+if [ -e $out/maven/bin/maven ]
+then
+  export OLD_HOME=$HOME
+  export HOME=.
+  $out/maven/bin/maven plugin:download -DgroupId=maven-plugins -DartifactId=maven-axis-plugin -Dversion=0.7
+  export HOME=OLD_HOME
+fi
diff --git a/nixpkgs/pkgs/development/tools/build-managers/apache-maven/default.nix b/nixpkgs/pkgs/development/tools/build-managers/apache-maven/default.nix
new file mode 100644
index 000000000000..3a1866e0b399
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/apache-maven/default.nix
@@ -0,0 +1,28 @@
+{ lib, stdenv, fetchurl, jdk, makeWrapper }:
+
+assert jdk != null;
+
+let version = "3.6.3"; in
+stdenv.mkDerivation rec {
+  pname = "apache-maven";
+  inherit version;
+
+  builder = ./builder.sh;
+
+  src = fetchurl {
+    url = "mirror://apache/maven/maven-3/${version}/binaries/${pname}-${version}-bin.tar.gz";
+    sha256 = "1i9qlj3vy4j1yyf22nwisd0pg88n9qzp9ymfhwqabadka7br3b96";
+  };
+
+  nativeBuildInputs = [ makeWrapper ];
+
+  inherit jdk;
+
+  meta = with lib; {
+    description = "Build automation tool (used primarily for Java projects)";
+    homepage = "http://maven.apache.org/";
+    license = licenses.asl20;
+    platforms = platforms.unix;
+    maintainers = with maintainers; [ cko ];
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/arpa2cm/default.nix b/nixpkgs/pkgs/development/tools/build-managers/arpa2cm/default.nix
new file mode 100644
index 000000000000..0af9e77acf57
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/arpa2cm/default.nix
@@ -0,0 +1,21 @@
+{ lib, stdenv, fetchFromGitHub, cmake }:
+
+stdenv.mkDerivation rec {
+  pname = "arpa2cm";
+  version = "0.5";
+
+  src = fetchFromGitHub {
+    sha256 = "093h7njj8d8iiwnw5byfxkkzlbny60fwv1w57j8f1lsd4yn6rih4";
+    rev = "version-${version}";
+    repo = pname;
+    owner = "arpa2";
+  };
+
+  nativeBuildInputs = [ cmake ];
+
+  meta = with lib; {
+    description = "CMake Module library for the ARPA2 project";
+    license = licenses.bsd2;
+    maintainers = with maintainers; [ leenaars ];
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bam/default.nix b/nixpkgs/pkgs/development/tools/build-managers/bam/default.nix
new file mode 100644
index 000000000000..556725cca6c4
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bam/default.nix
@@ -0,0 +1,39 @@
+{ lib, stdenv, fetchFromGitHub, lua5_3, python3 }:
+
+stdenv.mkDerivation rec {
+  pname = "bam";
+  version = "0.5.1";
+
+  src = fetchFromGitHub {
+    owner = "matricks";
+    repo = "bam";
+    rev = "v${version}";
+    sha256 = "13br735ig7lygvzyfd15fc2rdygrqm503j6xj5xkrl1r7w2wipq6";
+  };
+
+  nativeBuildInputs = [ lua5_3 python3 ];
+
+  buildPhase = "${stdenv.shell} make_unix.sh";
+
+  checkPhase = "${python3.interpreter} scripts/test.py";
+
+  strictDeps = true;
+
+  installPhase = ''
+    mkdir -p "$out/share/bam"
+    cp -r docs examples tests  "$out/share/bam"
+    mkdir -p "$out/bin"
+    cp bam "$out/bin"
+  '';
+
+  meta = with lib; {
+    description = "Yet another build manager";
+    maintainers = with maintainers;
+    [
+      raskin
+    ];
+    platforms = platforms.linux;
+    license = licenses.zlib;
+    downloadPage = "http://matricks.github.com/bam/";
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/bash-tools-test.nix b/nixpkgs/pkgs/development/tools/build-managers/bazel/bash-tools-test.nix
new file mode 100644
index 000000000000..b67a5ab22341
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/bash-tools-test.nix
@@ -0,0 +1,44 @@
+{ writeText, bazel, runLocal, bazelTest, distDir }:
+
+# Tests that certain executables are available in bazel-executed bash shells.
+
+let
+  WORKSPACE = writeText "WORKSPACE" ''
+    workspace(name = "our_workspace")
+  '';
+
+  fileIn = writeText "input.txt" ''
+  one
+  two
+  three
+  '';
+
+  fileBUILD = writeText "BUILD" ''
+    genrule(
+      name = "tool_usage",
+      srcs = [ ":input.txt" ],
+      outs = [ "output.txt" ],
+      cmd = "cat $(location :input.txt) | gzip - | gunzip - | awk '/t/' > $@",
+    )
+  '';
+
+  workspaceDir = runLocal "our_workspace" {} ''
+    mkdir $out
+    cp ${WORKSPACE} $out/WORKSPACE
+    cp ${fileIn} $out/input.txt
+    cp ${fileBUILD} $out/BUILD
+  '';
+
+  testBazel = bazelTest {
+    name = "bazel-test-bash-tools";
+    bazelPkg = bazel;
+    inherit workspaceDir;
+
+    bazelScript = ''
+      ${bazel}/bin/bazel build :tool_usage --distdir=${distDir}
+      cp bazel-bin/output.txt $out
+      echo "Testing content" && [ "$(cat $out | wc -l)" == "2" ] && echo "OK"
+    '';
+  };
+
+in testBazel
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel-remote/default.nix b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel-remote/default.nix
new file mode 100644
index 000000000000..1dfe784ec254
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel-remote/default.nix
@@ -0,0 +1,92 @@
+{ buildBazelPackage
+, cacert
+, fetchFromGitHub
+, git
+, go
+, lib
+, stdenv
+}:
+
+buildBazelPackage rec {
+  pname = "bazel-remote";
+  version = "1.0.0";
+
+  src = fetchFromGitHub {
+    owner = "buchgr";
+    repo = "bazel-remote";
+    rev = "v${version}";
+    sha256 = "1fpdw139d5q1377qnqbgkahmdr4mdaa17d2m10wkyvyvijwm4r2m";
+  };
+
+  nativeBuildInputs = [ go git ];
+
+  bazelTarget = "//:bazel-remote";
+
+  removeRulesCC = false;
+
+  # this is to work around `test -f` failing when called by gazelle
+  # https://github.com/bazelbuild/bazel-gazelle/blob/v0.19.1/internal/go_repository.bzl#L135
+  patches = [ ./disable_build_file_generation.patch ];
+
+  fetchAttrs = {
+    preBuild = ''
+      patchShebangs .
+
+      # tell rules_go to use the Go binary found in the PATH
+      sed -e 's:go_register_toolchains():go_register_toolchains(go_version = "host"):g' -i WORKSPACE
+
+      # tell rules_go to invoke GIT with custom CAINFO path
+      export GIT_SSL_CAINFO="${cacert}/etc/ssl/certs/ca-bundle.crt"
+
+      # force gazelle to use the nix go cache rather than its own
+      # export GO_REPOSITORY_USE_HOST_CACHE=1
+    '';
+
+    preInstall = ''
+      # Remove the go_sdk (it's just a copy of the go derivation) and all
+      # references to it from the marker files. Bazel does not need to download
+      # this sdk because we have patched the WORKSPACE file to point to the one
+      # currently present in PATH. Without removing the go_sdk from the marker
+      # file, the hash of it will change anytime the Go derivation changes and
+      # that would lead to impurities in the marker files which would result in
+      # a different sha256 for the fetch phase.
+      rm -rf $bazelOut/external/{go_sdk,\@go_sdk.marker}
+      sed -e '/^FILE:@go_sdk.*/d' -i $bazelOut/external/\@*.marker
+
+      # Remove the gazelle repository cache as it contains built binaries
+      chmod -R u+w $bazelOut/external/bazel_gazelle_go_repository_cache
+      rm -rf $bazelOut/external/{bazel_gazelle_go_repository_cache,\@bazel_gazelle_go_repository_cache.marker}
+      sed -e '/^FILE:@bazel_gazelle_go_repository_cache.*/d' -i $bazelOut/external/\@*.marker
+
+      # Remove the gazelle tools, they contain go binaries that are built
+      # non-deterministically. As long as the gazelle version matches the tools
+      # should be equivalent.
+      rm -rf $bazelOut/external/{bazel_gazelle_go_repository_tools,\@bazel_gazelle_go_repository_tools.marker}
+      sed -e '/^FILE:@bazel_gazelle_go_repository_tools.*/d' -i $bazelOut/external/\@*.marker
+    '';
+
+    sha256 = "1vijh3nl30n8k6xlx6in92pzs70x15akbqiqalk8apgvphvdz8vy";
+  };
+
+  buildAttrs = {
+    preBuild = ''
+      patchShebangs .
+
+      # tell rules_go to use the Go binary found in the PATH
+      sed -e 's:go_register_toolchains():go_register_toolchains(go_version = "host"):g' -i WORKSPACE
+    '';
+
+    installPhase = ''
+      install -Dm755 bazel-bin/*_pure_stripped/bazel-remote $out/bin/bazel-remote
+    '';
+  };
+
+  meta = with lib; {
+    homepage = "https://github.com/buchgr/bazel-remote";
+    description = "A remote HTTP/1.1 cache for Bazel";
+    license = licenses.asl20;
+    maintainers = [ maintainers.uri-canva ];
+    platforms = platforms.darwin ++ platforms.linux;
+    broken = stdenv.isDarwin;
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel-remote/disable_build_file_generation.patch b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel-remote/disable_build_file_generation.patch
new file mode 100644
index 000000000000..67df8f559a20
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel-remote/disable_build_file_generation.patch
@@ -0,0 +1,24 @@
+From 3f5abd591b93ebdbc1ae82e5c29cf26024222f5f Mon Sep 17 00:00:00 2001
+From: Uri Baghin <uri@canva.com>
+Date: Thu, 30 Jan 2020 16:47:36 +1100
+Subject: [PATCH] Disable build file generation for remote apis.
+
+---
+ WORKSPACE | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/WORKSPACE b/WORKSPACE
+index f9ebafa..52e4e0b 100644
+--- a/WORKSPACE
++++ b/WORKSPACE
+@@ -208,6 +208,7 @@ http_archive(
+ 
+ go_repository(
+     name = "com_github_bazelbuild_remote_apis",
++    build_file_generation = "off",
+     importpath = "github.com/bazelbuild/remote-apis",
+     sum = "h1:OPH+hf+ICw8WEp2CV2ncfdyWPC30Cmw8b5NKun0n5IQ=",
+     version = "v0.0.0-20191119143007-b5123b1bb285",
+-- 
+2.25.0
+
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_0_26/default.nix b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_0_26/default.nix
new file mode 100644
index 000000000000..f03f42be389f
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_0_26/default.nix
@@ -0,0 +1,390 @@
+{ stdenv, callPackage, lib, fetchurl, fetchpatch, runCommand, makeWrapper
+, zip, unzip, bash, writeCBin, coreutils
+, which, python3, perl, gawk, gnused, gnutar, gnugrep, gzip, findutils
+# Apple dependencies
+, cctools, llvmPackages_8, CoreFoundation, CoreServices, Foundation
+# Allow to independently override the jdks used to build and run respectively
+, buildJdk, runJdk
+, buildJdkName
+, runtimeShell
+# Always assume all markers valid (don't redownload dependencies).
+# Also, don't clean up environment variables.
+, enableNixHacks ? false
+}:
+
+let
+  srcDeps = [
+    # From: $REPO_ROOT/WORKSPACE
+    (fetchurl {
+      url = "https://github.com/google/desugar_jdk_libs/archive/915f566d1dc23bc5a8975320cd2ff71be108eb9c.zip";
+      sha256 = "0b926df7yxyyyiwm9cmdijy6kplf0sghm23sf163zh8wrk87wfi7";
+    })
+    (fetchurl {
+        url = "https://mirror.bazel.build/github.com/bazelbuild/skydoc/archive/2d9566b21fbe405acf5f7bf77eda30df72a4744c.tar.gz";
+        sha256 = "4a1318fed4831697b83ce879b3ab70ae09592b167e5bda8edaff45132d1c3b3f";
+    })
+    (fetchurl {
+        url = "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/archive/f83cb8dd6f5658bc574ccd873e25197055265d1c.tar.gz";
+        sha256 = "ba5d15ca230efca96320085d8e4d58da826d1f81b444ef8afccd8b23e0799b52";
+    })
+    (fetchurl {
+      url = "https://mirror.bazel.build/github.com/bazelbuild/rules_sass/archive/8ccf4f1c351928b55d5dddf3672e3667f6978d60.tar.gz";
+      sha256 = "d868ce50d592ef4aad7dec4dd32ae68d2151261913450fac8390b3fd474bb898";
+    })
+     (fetchurl {
+         url = "https://mirror.bazel.build/bazel_java_tools/releases/javac10/v3.1/java_tools_javac10_linux-v3.1.zip";
+         sha256 = "a0cd51f9db1bf05a722ff7f5c60a07fa1c7d27428fff0815c342d32aa6c53576";
+     })
+    (fetchurl {
+        url = "https://mirror.bazel.build/bazel_java_tools/releases/javac10/v3.1/java_tools_javac10_darwin-v3.1.zip";
+        sha256 = "c646aad8808b8ec5844d6a80a1287fc8e13203375fe40d6af4819eff48b9bbaf";
+    })
+    (fetchurl {
+        url = "https://mirror.bazel.build/bazel_coverage_output_generator/releases/coverage_output_generator-v1.0.zip";
+        sha256 = "cc470e529fafb6165b5be3929ff2d99b38429b386ac100878687416603a67889";
+    })
+    (fetchurl {
+        url = "https://github.com/bazelbuild/rules_nodejs/archive/0.16.2.zip";
+        sha256 = "9b72bb0aea72d7cbcfc82a01b1e25bf3d85f791e790ddec16c65e2d906382ee0";
+    })
+    (fetchurl {
+        url = "https://mirror.bazel.build/bazel_android_tools/android_tools_pkg-0.2.tar.gz";
+        sha256 = "04f85f2dd049e87805511e3babc5cea3f5e72332b1627e34f3a5461cc38e815f";
+    })
+  ];
+
+  distDir = runCommand "bazel-deps" {} ''
+    mkdir -p $out
+    for i in ${builtins.toString srcDeps}; do cp $i $out/$(stripHash $i); done
+  '';
+
+  defaultShellPath = lib.makeBinPath
+    # Keep this list conservative. For more exotic tools, prefer to use
+    # @rules_nixpkgs to pull in tools from the nix repository. Example:
+    #
+    # WORKSPACE:
+    #
+    #     nixpkgs_git_repository(
+    #         name = "nixpkgs",
+    #         revision = "def5124ec8367efdba95a99523dd06d918cb0ae8",
+    #     )
+    #
+    #     # This defines an external Bazel workspace.
+    #     nixpkgs_package(
+    #         name = "bison",
+    #         repositories = { "nixpkgs": "@nixpkgs//:default.nix" },
+    #     )
+    #
+    # some/BUILD.bazel:
+    #
+    #     genrule(
+    #        ...
+    #        cmd = "$(location @bison//:bin/bison) -other -args",
+    #        tools = [
+    #            ...
+    #            "@bison//:bin/bison",
+    #        ],
+    #     )
+    #
+    [ bash coreutils findutils gawk gnugrep gnutar gnused gzip which unzip ];
+
+  # Java toolchain used for the build and tests
+  javaToolchain = "@bazel_tools//tools/jdk:toolchain_host${buildJdkName}";
+  stdenv' = if stdenv.isDarwin then llvmPackages_8.libcxxStdenv else stdenv;
+
+in
+stdenv'.mkDerivation rec {
+
+  version = "0.26.0";
+
+  meta = with lib; {
+    homepage = "https://github.com/bazelbuild/bazel/";
+    description = "Build tool that builds code quickly and reliably";
+    license = licenses.asl20;
+    platforms = platforms.linux ++ platforms.darwin;
+  };
+
+  # Additional tests that check bazel’s functionality. Execute
+  #
+  #     nix-build . -A bazel.tests
+  #
+  # in the nixpkgs checkout root to exercise them locally.
+  passthru.tests = {
+    pythonBinPath = callPackage ./python-bin-path-test.nix {};
+    bashTools = callPackage ./bash-tools-test.nix {};
+  };
+
+  name = "bazel-${version}";
+
+  src = fetchurl {
+    url = "https://github.com/bazelbuild/bazel/releases/download/${version}/${name}-dist.zip";
+    sha256 = "d26dadf62959255d58e523da3448a6222af768fe1224e321b120c1d5bbe4b4f2";
+  };
+
+  # Necessary for the tests to pass on Darwin with sandbox enabled.
+  # Bazel starts a local server and needs to bind a local address.
+  __darwinAllowLocalNetworking = true;
+
+  sourceRoot = ".";
+
+  patches = [
+    ./glibc.patch
+    ./python-stub-path-fix.patch
+  ] ++ lib.optional enableNixHacks ../nix-hacks.patch;
+
+  # Bazel expects several utils to be available in Bash even without PATH. Hence this hack.
+
+  customBash = writeCBin "bash" ''
+    #include <stdio.h>
+    #include <stdlib.h>
+    #include <string.h>
+    #include <unistd.h>
+
+    extern char **environ;
+
+    int main(int argc, char *argv[]) {
+      char *path = getenv("PATH");
+      char *pathToAppend = "${defaultShellPath}";
+      char *newPath;
+      if (path != NULL) {
+        int length = strlen(path) + 1 + strlen(pathToAppend) + 1;
+        newPath = malloc(length * sizeof(char));
+        snprintf(newPath, length, "%s:%s", path, pathToAppend);
+      } else {
+        newPath = pathToAppend;
+      }
+      setenv("PATH", newPath, 1);
+      execve("${bash}/bin/bash", argv, environ);
+      return 0;
+    }
+  '';
+
+  postPatch = let
+
+    darwinPatches = ''
+      bazelLinkFlags () {
+        eval set -- "$NIX_LDFLAGS"
+        local flag
+        for flag in "$@"; do
+          printf ' -Wl,%s' "$flag"
+        done
+      }
+
+      # Disable Bazel's Xcode toolchain detection which would configure compilers
+      # and linkers from Xcode instead of from PATH
+      export BAZEL_USE_CPP_ONLY_TOOLCHAIN=1
+
+      # Explicitly configure gcov since we don't have it on Darwin, so autodetection fails
+      export GCOV=${coreutils}/bin/false
+
+      # Framework search paths aren't added by bintools hook
+      # https://github.com/NixOS/nixpkgs/pull/41914
+      export NIX_LDFLAGS+=" -F${CoreFoundation}/Library/Frameworks -F${CoreServices}/Library/Frameworks -F${Foundation}/Library/Frameworks"
+
+      # libcxx includes aren't added by libcxx hook
+      # https://github.com/NixOS/nixpkgs/pull/41589
+      export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -isystem ${llvmPackages_8.libcxx}/include/c++/v1"
+
+      # don't use system installed Xcode to run clang, use Nix clang instead
+      sed -i -E "s;/usr/bin/xcrun (--sdk macosx )?clang;${stdenv'.cc}/bin/clang $NIX_CFLAGS_COMPILE $(bazelLinkFlags) -framework CoreFoundation;g" \
+        scripts/bootstrap/compile.sh \
+        src/tools/xcode/realpath/BUILD \
+        src/tools/xcode/stdredirect/BUILD \
+        tools/osx/BUILD
+
+      # nixpkgs's libSystem cannot use pthread headers directly, must import GCD headers instead
+      sed -i -e "/#include <pthread\/spawn.h>/i #include <dispatch/dispatch.h>" src/main/cpp/blaze_util_darwin.cc
+
+      # clang installed from Xcode has a compatibility wrapper that forwards
+      # invocations of gcc to clang, but vanilla clang doesn't
+      sed -i -e 's;_find_generic(repository_ctx, "gcc", "CC", overriden_tools);_find_generic(repository_ctx, "clang", "CC", overriden_tools);g' tools/cpp/unix_cc_configure.bzl
+
+      sed -i -e 's;/usr/bin/libtool;${cctools}/bin/libtool;g' tools/cpp/unix_cc_configure.bzl
+      wrappers=( tools/cpp/osx_cc_wrapper.sh tools/cpp/osx_cc_wrapper.sh.tpl )
+      for wrapper in "''${wrappers[@]}"; do
+        sed -i -e "s,/usr/bin/install_name_tool,${cctools}/bin/install_name_tool,g" $wrapper
+      done
+    '';
+
+    genericPatches = ''
+      # Substitute python's stub shebang to plain python path. (see TODO add pr URL)
+      # See also `postFixup` where python is added to $out/nix-support
+      substituteInPlace src/main/java/com/google/devtools/build/lib/bazel/rules/python/python_stub_template.txt\
+          --replace "/usr/bin/env python" "${python3.interpreter}" \
+          --replace "NIX_STORE_PYTHON_PATH" "${python3.interpreter}" \
+
+      # md5sum is part of coreutils
+      sed -i 's|/sbin/md5|md5sum|' \
+        src/BUILD
+
+      # substituteInPlace is rather slow, so prefilter the files with grep
+      grep -rlZ /bin src/main/java/com/google/devtools | while IFS="" read -r -d "" path; do
+        # If you add more replacements here, you must change the grep above!
+        # Only files containing /bin are taken into account.
+        substituteInPlace "$path" \
+          --replace /bin/bash ${customBash}/bin/bash \
+          --replace /usr/bin/env ${coreutils}/bin/env \
+          --replace /bin/true ${coreutils}/bin/true
+      done
+
+      # Fixup scripts that generate scripts. Not fixed up by patchShebangs below.
+      substituteInPlace scripts/bootstrap/compile.sh \
+          --replace /bin/bash ${customBash}/bin/bash
+
+      # add nix environment vars to .bazelrc
+      cat >> .bazelrc <<EOF
+      build --experimental_distdir=${distDir}
+      fetch --experimental_distdir=${distDir}
+      build --copt="$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --copt="/g')"
+      build --host_copt="$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --host_copt="/g')"
+      build --linkopt="$(echo $(< ${stdenv'.cc}/nix-support/libcxx-ldflags) | sed -e 's/ /" --linkopt="/g')"
+      build --host_linkopt="$(echo $(< ${stdenv'.cc}/nix-support/libcxx-ldflags) | sed -e 's/ /" --host_linkopt="/g')"
+      build --linkopt="-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --linkopt="-Wl,/g')"
+      build --host_linkopt="-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --host_linkopt="-Wl,/g')"
+      build --host_javabase='@local_jdk//:jdk'
+      build --host_java_toolchain='${javaToolchain}'
+      EOF
+
+      # add the same environment vars to compile.sh
+      sed -e "/\$command \\\\$/a --copt=\"$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --copt=\"/g')\" \\\\" \
+          -e "/\$command \\\\$/a --host_copt=\"$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --host_copt=\"/g')\" \\\\" \
+          -e "/\$command \\\\$/a --linkopt=\"$(echo $(< ${stdenv'.cc}/nix-support/libcxx-ldflags) | sed -e 's/ /" --linkopt=\"/g')\" \\\\" \
+          -e "/\$command \\\\$/a --host_linkopt=\"$(echo $(< ${stdenv'.cc}/nix-support/libcxx-ldflags) | sed -e 's/ /" --host_linkopt=\"/g')\" \\\\" \
+          -e "/\$command \\\\$/a --linkopt=\"-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --linkopt=\"-Wl,/g')\" \\\\" \
+          -e "/\$command \\\\$/a --host_linkopt=\"-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --host_linkopt=\"-Wl,/g')\" \\\\" \
+          -e "/\$command \\\\$/a --host_javabase='@local_jdk//:jdk' \\\\" \
+          -e "/\$command \\\\$/a --host_java_toolchain='${javaToolchain}' \\\\" \
+          -i scripts/bootstrap/compile.sh
+
+      # --experimental_strict_action_env (which will soon become the
+      # default, see bazelbuild/bazel#2574) hardcodes the default
+      # action environment to a value that on NixOS at least is bogus.
+      # So we hardcode it to something useful.
+      substituteInPlace \
+        src/main/java/com/google/devtools/build/lib/bazel/rules/BazelRuleClassProvider.java \
+        --replace /bin:/usr/bin ${defaultShellPath}
+
+      # This is necessary to avoid:
+      # "error: no visible @interface for 'NSDictionary' declares the selector
+      # 'initWithContentsOfURL:error:'"
+      # This can be removed when the apple_sdk is upgraded beyond 10.13+
+      sed -i '/initWithContentsOfURL:versionPlistUrl/ {
+        N
+        s/error:nil\];/\];/
+      }' tools/osx/xcode_locator.m
+
+      # append the PATH with defaultShellPath in tools/bash/runfiles/runfiles.bash
+      echo "PATH=\$PATH:${defaultShellPath}" >> runfiles.bash.tmp
+      cat tools/bash/runfiles/runfiles.bash >> runfiles.bash.tmp
+      mv runfiles.bash.tmp tools/bash/runfiles/runfiles.bash
+
+      patchShebangs .
+    '';
+    in lib.optionalString stdenv.hostPlatform.isDarwin darwinPatches
+     + genericPatches;
+
+  buildInputs = [
+    buildJdk
+  ];
+
+  strictDeps = true;
+
+  # when a command can’t be found in a bazel build, you might also
+  # need to add it to `defaultShellPath`.
+  nativeBuildInputs = [
+    zip
+    python3
+    unzip
+    makeWrapper
+    which
+    customBash
+  ] ++ lib.optionals (stdenv.isDarwin) [ cctools CoreFoundation CoreServices Foundation ];
+
+  # Bazel makes extensive use of symlinks in the WORKSPACE.
+  # This causes problems with infinite symlinks if the build output is in the same location as the
+  # Bazel WORKSPACE. This is why before executing the build, the source code is moved into a
+  # subdirectory.
+  # Failing to do this causes "infinite symlink expansion detected"
+  preBuildPhases = ["preBuildPhase"];
+  preBuildPhase = ''
+    mkdir bazel_src
+    shopt -s dotglob extglob
+    mv !(bazel_src) bazel_src
+  '';
+
+  buildPhase = ''
+    # Increasing memory during compilation might be necessary.
+    # export BAZEL_JAVAC_OPTS="-J-Xmx2g -J-Xms200m"
+    ./bazel_src/compile.sh
+    ./bazel_src/scripts/generate_bash_completion.sh \
+        --bazel=./bazel_src/output/bazel \
+        --output=./bazel_src/output/bazel-complete.bash \
+        --prepend=./bazel_src/scripts/bazel-complete-header.bash \
+        --prepend=./bazel_src/scripts/bazel-complete-template.bash
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+
+    # official wrapper scripts that searches for $WORKSPACE_ROOT/tools/bazel
+    # if it can’t find something in tools, it calls $out/bin/bazel-real
+    cp ./bazel_src/scripts/packages/bazel.sh $out/bin/bazel
+    mv ./bazel_src/output/bazel $out/bin/bazel-real
+
+    wrapProgram "$out/bin/bazel" --add-flags --server_javabase="${runJdk}"
+
+    # shell completion files
+    mkdir -p $out/share/bash-completion/completions $out/share/zsh/site-functions
+    mv ./bazel_src/output/bazel-complete.bash $out/share/bash-completion/completions/bazel
+    cp ./bazel_src/scripts/zsh_completion/_bazel $out/share/zsh/site-functions/
+  '';
+
+  # Temporarily disabling for now. A new approach is needed for this derivation as Bazel
+  # accesses the internet during the tests which fails in a sandbox.
+  doInstallCheck = false;
+  installCheckPhase = ''
+    export TEST_TMPDIR=$(pwd)
+
+    hello_test () {
+      $out/bin/bazel test \
+        --test_output=errors \
+        --java_toolchain='${javaToolchain}' \
+        examples/cpp:hello-success_test \
+        examples/java-native/src/test/java/com/example/myproject:hello
+    }
+
+    cd ./bazel_src
+
+    # test whether $WORKSPACE_ROOT/tools/bazel works
+
+    mkdir -p tools
+    cat > tools/bazel <<"EOF"
+    #!${runtimeShell} -e
+    exit 1
+    EOF
+    chmod +x tools/bazel
+
+    # first call should fail if tools/bazel is used
+    ! hello_test
+
+    cat > tools/bazel <<"EOF"
+    #!${runtimeShell} -e
+    exec "$BAZEL_REAL" "$@"
+    EOF
+
+    # second call succeeds because it defers to $out/bin/bazel-real
+    hello_test
+  '';
+
+  # Save paths to hardcoded dependencies so Nix can detect them.
+  postFixup = ''
+    mkdir -p $out/nix-support
+    echo "${customBash} ${defaultShellPath}" >> $out/nix-support/depends
+    # The templates get tar’d up into a .jar,
+    # so nix can’t detect python is needed in the runtime closure
+    echo "${python3}" >> $out/nix-support/depends
+  '';
+
+  dontStrip = true;
+  dontPatchELF = true;
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_0_26/glibc.patch b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_0_26/glibc.patch
new file mode 100644
index 000000000000..c4de48068f11
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_0_26/glibc.patch
@@ -0,0 +1,78 @@
+From https://github.com/grpc/grpc/commit/57586a1ca7f17b1916aed3dea4ff8de872dbf853
+From: Benjamin Peterson <benjamin@dropbox.com>
+Date: Fri, 3 May 2019 08:11:00 -0700
+Subject: [PATCH] Rename gettid() functions.
+
+glibc 2.30 will declare its own gettid; see https://sourceware.org/git/?p=glibc.git;a=commit;h=1d0fc213824eaa2a8f8c4385daaa698ee8fb7c92. Rename the grpc versions to avoid naming conflicts.
+---
+ src/core/lib/gpr/log_linux.cc          | 6 ++----
+ src/core/lib/gpr/log_posix.cc          | 4 ++--
+ src/core/lib/iomgr/ev_epollex_linux.cc | 4 ++--
+ 3 files changed, 6 insertions(+), 8 deletions(-)
+
+diff --git a/third_party/grpc/src/core/lib/gpr/log_linux.cc b/src/core/lib/gpr/log_linux.cc
+index 81026e5689b..8b597b4cf2f 100644
+--- a/third_party/grpc/src/core/lib/gpr/log_linux.cc
++++ b/third_party/grpc/src/core/lib/gpr/log_linux.cc
+@@ -40,7 +40,7 @@
+ #include <time.h>
+ #include <unistd.h>
+
+-static long gettid(void) { return syscall(__NR_gettid); }
++static long sys_gettid(void) { return syscall(__NR_gettid); }
+
+ void gpr_log(const char* file, int line, gpr_log_severity severity,
+              const char* format, ...) {
+@@ -70,7 +70,7 @@ void gpr_default_log(gpr_log_func_args* args) {
+   gpr_timespec now = gpr_now(GPR_CLOCK_REALTIME);
+   struct tm tm;
+   static __thread long tid = 0;
+-  if (tid == 0) tid = gettid();
++  if (tid == 0) tid = sys_gettid();
+
+   timer = static_cast<time_t>(now.tv_sec);
+   final_slash = strrchr(args->file, '/');
+diff --git a/third_party/grpc/src/core/lib/gpr/log_posix.cc b/src/core/lib/gpr/log_posix.cc
+index b6edc14ab6b..2f7c6ce3760 100644
+--- a/third_party/grpc/src/core/lib/gpr/log_posix.cc
++++ b/third_party/grpc/src/core/lib/gpr/log_posix.cc
+@@ -31,7 +31,7 @@
+ #include <string.h>
+ #include <time.h>
+
+-static intptr_t gettid(void) { return (intptr_t)pthread_self(); }
++static intptr_t sys_gettid(void) { return (intptr_t)pthread_self(); }
+
+ void gpr_log(const char* file, int line, gpr_log_severity severity,
+              const char* format, ...) {
+@@ -86,7 +86,7 @@ void gpr_default_log(gpr_log_func_args* args) {
+   char* prefix;
+   gpr_asprintf(&prefix, "%s%s.%09d %7" PRIdPTR " %s:%d]",
+                gpr_log_severity_string(args->severity), time_buffer,
+-               (int)(now.tv_nsec), gettid(), display_file, args->line);
++               (int)(now.tv_nsec), sys_gettid(), display_file, args->line);
+
+   fprintf(stderr, "%-70s %s\n", prefix, args->message);
+   gpr_free(prefix);
+diff --git a/third_party/grpc/src/core/lib/iomgr/ev_epollex_linux.cc b/src/core/lib/iomgr/ev_epollex_linux.cc
+index c2d80c08ddb..4a83cb6c215 100644
+--- a/third_party/grpc/src/core/lib/iomgr/ev_epollex_linux.cc
++++ b/third_party/grpc/src/core/lib/iomgr/ev_epollex_linux.cc
+@@ -1077,7 +1077,7 @@ static void end_worker(grpc_pollset* pollset, grpc_pollset_worker* worker,
+ }
+
+ #ifndef NDEBUG
+-static long gettid(void) { return syscall(__NR_gettid); }
++static long sys_gettid(void) { return syscall(__NR_gettid); }
+ #endif
+
+ /* pollset->mu lock must be held by the caller before calling this.
+@@ -1097,7 +1097,7 @@ static grpc_error* pollset_work(grpc_pollset* pollset,
+ #define WORKER_PTR (&worker)
+ #endif
+ #ifndef NDEBUG
+-  WORKER_PTR->originator = gettid();
++  WORKER_PTR->originator = sys_gettid();
+ #endif
+   if (GRPC_TRACE_FLAG_ENABLED(grpc_polling_trace)) {
+     gpr_log(GPR_INFO,
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_0_26/python-stub-path-fix.patch b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_0_26/python-stub-path-fix.patch
new file mode 100644
index 000000000000..cbc4192d2d9b
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_0_26/python-stub-path-fix.patch
@@ -0,0 +1,13 @@
+diff --git a/src/main/java/com/google/devtools/build/lib/bazel/rules/python/python_stub_template.txt b/src/main/java/com/google/devtools/build/lib/bazel/rules/python/python_stub_template.txt
+index dac21c9a83..69b11c283f 100644
+--- a/src/main/java/com/google/devtools/build/lib/bazel/rules/python/python_stub_template.txt
++++ b/src/main/java/com/google/devtools/build/lib/bazel/rules/python/python_stub_template.txt
+@@ -67,7 +67,7 @@ def FindPythonBinary(module_space):
+     return os.path.join(module_space, PYTHON_BINARY)
+   else:
+     # Case 4: Path has to be looked up in the search path.
+-    return SearchPath(PYTHON_BINARY)
++    return "NIX_STORE_PYTHON_PATH"
+ 
+ def CreatePythonPathEntries(python_imports, module_space):
+   parts = python_imports.split(':');
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_0_29/default.nix b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_0_29/default.nix
new file mode 100644
index 000000000000..92bbbd452145
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_0_29/default.nix
@@ -0,0 +1,564 @@
+{ stdenv, callPackage, lib, fetchurl, fetchFromGitHub
+, runCommand, runCommandCC, makeWrapper, recurseIntoAttrs
+# this package (through the fixpoint glass)
+, bazel_self
+, lr, xe, zip, unzip, bash, writeCBin, coreutils
+, which, gawk, gnused, gnutar, gnugrep, gzip, findutils
+# updater
+, python27, python3, writeScript
+# Apple dependencies
+, cctools, llvmPackages_8, CoreFoundation, CoreServices, Foundation
+# Allow to independently override the jdks used to build and run respectively
+, buildJdk, runJdk
+, buildJdkName
+, runtimeShell
+# Downstream packages for tests
+, bazel-watcher
+# Always assume all markers valid (this is needed because we remove markers; they are non-deterministic).
+# Also, don't clean up environment variables (so that NIX_ environment variables are passed to compilers).
+, enableNixHacks ? false
+, gcc-unwrapped
+, autoPatchelfHook
+, file
+, substituteAll
+, writeTextFile
+}:
+
+let
+  version = "0.29.1";
+
+  src = fetchurl {
+    url = "https://github.com/bazelbuild/bazel/releases/download/${version}/bazel-${version}-dist.zip";
+    sha256 = "1rcd6xy61n07n7m6dgcw23275r8z3gkwmqdkd48nwrq8yb7m4al7";
+  };
+
+  # Update with `eval $(nix-build -A bazel.updater)`,
+  # then add new dependencies from the dict in ./src-deps.json as required.
+  srcDeps = lib.attrsets.attrValues srcDepsSet;
+  srcDepsSet =
+    let
+      srcs = (builtins.fromJSON (builtins.readFile ./src-deps.json));
+      toFetchurl = d: lib.attrsets.nameValuePair d.name (fetchurl {
+        urls = d.urls;
+        sha256 = d.sha256;
+        });
+        in builtins.listToAttrs (map toFetchurl [
+      srcs.desugar_jdk_libs
+      srcs.io_bazel_skydoc
+      srcs.bazel_skylib
+      srcs.io_bazel_rules_sass
+      srcs.platforms
+      (if stdenv.hostPlatform.isDarwin
+       then srcs."java_tools_javac11_darwin-v4.0.zip"
+       else srcs."java_tools_javac11_linux-v4.0.zip")
+      srcs."coverage_output_generator-v1.0.zip"
+      srcs.build_bazel_rules_nodejs
+      srcs."android_tools_pkg-0.8.tar.gz"
+      srcs."0.27.1.tar.gz"
+      srcs.rules_pkg
+      srcs.rules_cc
+      srcs.rules_java
+      srcs.rules_proto
+      ]);
+
+  distDir = runCommand "bazel-deps" {} ''
+    mkdir -p $out
+    for i in ${builtins.toString srcDeps}; do cp $i $out/$(stripHash $i); done
+  '';
+
+  defaultShellPath = lib.makeBinPath
+    # Keep this list conservative. For more exotic tools, prefer to use
+    # @rules_nixpkgs to pull in tools from the nix repository. Example:
+    #
+    # WORKSPACE:
+    #
+    #     nixpkgs_git_repository(
+    #         name = "nixpkgs",
+    #         revision = "def5124ec8367efdba95a99523dd06d918cb0ae8",
+    #     )
+    #
+    #     # This defines an external Bazel workspace.
+    #     nixpkgs_package(
+    #         name = "bison",
+    #         repositories = { "nixpkgs": "@nixpkgs//:default.nix" },
+    #     )
+    #
+    # some/BUILD.bazel:
+    #
+    #     genrule(
+    #        ...
+    #        cmd = "$(location @bison//:bin/bison) -other -args",
+    #        tools = [
+    #            ...
+    #            "@bison//:bin/bison",
+    #        ],
+    #     )
+    #
+    [ bash coreutils findutils gawk gnugrep gnutar gnused gzip which unzip file zip ];
+
+  # Java toolchain used for the build and tests
+  javaToolchain = "@bazel_tools//tools/jdk:toolchain_host${buildJdkName}";
+
+  platforms = lib.platforms.linux ++ lib.platforms.darwin;
+
+  # This repository is fetched by bazel at runtime
+  # however it contains prebuilt java binaries, with wrong interpreter
+  # and libraries path.
+  # We prefetch it, patch it, and override it in a global bazelrc.
+  system = if stdenv.hostPlatform.isDarwin then "darwin" else "linux";
+
+  remote_java_tools = stdenv.mkDerivation {
+    name = "remote_java_tools_${system}";
+
+    src = srcDepsSet."java_tools_javac11_${system}-v4.0.zip";
+
+    nativeBuildInputs = [ autoPatchelfHook unzip ];
+    buildInputs = [ gcc-unwrapped ];
+
+    sourceRoot = ".";
+
+    buildPhase = ''
+      mkdir $out;
+    '';
+
+    installPhase = ''
+      cp -Ra * $out/
+      touch $out/WORKSPACE
+    '';
+  };
+
+  bazelRC = writeTextFile {
+    name = "bazel-rc";
+    text = ''
+      build --override_repository=${remote_java_tools.name}=${remote_java_tools}
+      build --distdir=${distDir}
+      startup --server_javabase=${runJdk}
+
+      # load default location for the system wide configuration
+      try-import /etc/bazel.bazelrc
+    '';
+  };
+  stdenv' = if stdenv.isDarwin then llvmPackages_8.libcxxStdenv else stdenv;
+
+in
+stdenv'.mkDerivation rec {
+  pname = "bazel";
+  inherit version;
+
+  meta = with lib; {
+    homepage = "https://github.com/bazelbuild/bazel/";
+    description = "Build tool that builds code quickly and reliably";
+    license = licenses.asl20;
+    maintainers = [ maintainers.mboes ];
+    inherit platforms;
+  };
+
+  inherit src;
+  sourceRoot = ".";
+
+  patches = [
+    # On Darwin, the last argument to gcc is coming up as an empty string. i.e: ''
+    # This is breaking the build of any C target. This patch removes the last
+    # argument if it's found to be an empty string.
+    ../trim-last-argument-to-gcc-if-empty.patch
+    ./glibc.patch
+
+    # --experimental_strict_action_env (which may one day become the default
+    # see bazelbuild/bazel#2574) hardcodes the default
+    # action environment to a non hermetic value (e.g. "/usr/local/bin").
+    # This is non hermetic on non-nixos systems. On NixOS, bazel cannot find the required binaries.
+    # So we are replacing this bazel paths by defaultShellPath,
+    # improving hermeticity and making it work in nixos.
+    (substituteAll {
+      src = ../strict_action_env.patch;
+      strictActionEnvPatch = defaultShellPath;
+    })
+
+    # bazel reads its system bazelrc in /etc
+    # override this path to a builtin one
+    (substituteAll {
+      src = ../bazel_rc.patch;
+      bazelSystemBazelRCPath = bazelRC;
+    })
+  ] ++ lib.optional enableNixHacks ../nix-hacks.patch;
+
+
+  # Additional tests that check bazel’s functionality. Execute
+  #
+  #     nix-build . -A bazel.tests
+  #
+  # in the nixpkgs checkout root to exercise them locally.
+  passthru.tests =
+    let
+      runLocal = name: attrs: script:
+      let
+        attrs' = removeAttrs attrs [ "buildInputs" ];
+        buildInputs = [ python3 ] ++ (attrs.buildInputs or []);
+      in
+      runCommandCC name ({
+        inherit buildInputs;
+        preferLocalBuild = true;
+        meta.platforms = platforms;
+      } // attrs') script;
+
+      # bazel wants to extract itself into $install_dir/install every time it runs,
+      # so let’s do that only once.
+      extracted = bazelPkg:
+        let install_dir =
+          # `install_base` field printed by `bazel info`, minus the hash.
+          # yes, this path is kinda magic. Sorry.
+          "$HOME/.cache/bazel/_bazel_nixbld";
+        in runLocal "bazel-extracted-homedir" { passthru.install_dir = install_dir; } ''
+            export HOME=$(mktemp -d)
+            touch WORKSPACE # yeah, everything sucks
+            install_base="$(${bazelPkg}/bin/bazel info | grep install_base)"
+            # assert it’s actually below install_dir
+            [[ "$install_base" =~ ${install_dir} ]] \
+              || (echo "oh no! $install_base but we are \
+            trying to copy ${install_dir} to $out instead!"; exit 1)
+            cp -R ${install_dir} $out
+          '';
+
+      bazelTest = { name, bazelScript, workspaceDir, bazelPkg, buildInputs ? [] }:
+        let
+          be = extracted bazelPkg;
+        in runLocal name { inherit buildInputs; } (
+          # skip extraction caching on Darwin, because nobody knows how Darwin works
+          (lib.optionalString (!stdenv.hostPlatform.isDarwin) ''
+            # set up home with pre-unpacked bazel
+            export HOME=$(mktemp -d)
+            mkdir -p ${be.install_dir}
+            cp -R ${be}/install ${be.install_dir}
+
+            # https://stackoverflow.com/questions/47775668/bazel-how-to-skip-corrupt-installation-on-centos6
+            # Bazel checks whether the mtime of the install dir files
+            # is >9 years in the future, otherwise it extracts itself again.
+            # see PosixFileMTime::IsUntampered in src/main/cpp/util
+            # What the hell bazel.
+            ${lr}/bin/lr -0 -U ${be.install_dir} | ${xe}/bin/xe -N0 -0 touch --date="9 years 6 months" {}
+          '')
+          +
+          ''
+            # Note https://github.com/bazelbuild/bazel/issues/5763#issuecomment-456374609
+            # about why to create a subdir for the workspace.
+            cp -r ${workspaceDir} wd && chmod u+w wd && cd wd
+
+            ${bazelScript}
+
+            touch $out
+          '');
+
+      bazelWithNixHacks = bazel_self.override { enableNixHacks = true; };
+
+      bazel-examples = fetchFromGitHub {
+        owner = "bazelbuild";
+        repo = "examples";
+        rev = "5d8c8961a2516ebf875787df35e98cadd08d43dc";
+        sha256 = "03c1bwlq5bs3hg96v4g4pg2vqwhqq6w538h66rcpw02f83yy7fs8";
+      };
+
+    in (if !stdenv.hostPlatform.isDarwin then {
+      # `extracted` doesn’t work on darwin
+      shebang = callPackage ../shebang-test.nix { inherit runLocal extracted bazelTest distDir; };
+    } else {}) // {
+      bashTools = callPackage ../bash-tools-test.nix { inherit runLocal bazelTest distDir; };
+      cpp = callPackage ../cpp-test.nix { inherit runLocal bazelTest bazel-examples distDir; };
+      java = callPackage ../java-test.nix { inherit runLocal bazelTest bazel-examples distDir; };
+      protobuf = callPackage ../protobuf-test.nix { inherit runLocal bazelTest distDir; };
+      pythonBinPath = callPackage ../python-bin-path-test.nix { inherit runLocal bazelTest distDir; };
+
+      bashToolsWithNixHacks = callPackage ../bash-tools-test.nix { inherit runLocal bazelTest distDir; bazel = bazelWithNixHacks; };
+
+      cppWithNixHacks = callPackage ../cpp-test.nix { inherit runLocal bazelTest bazel-examples distDir; bazel = bazelWithNixHacks; };
+      javaWithNixHacks = callPackage ../java-test.nix { inherit runLocal bazelTest bazel-examples distDir; bazel = bazelWithNixHacks; };
+      protobufWithNixHacks = callPackage ../protobuf-test.nix { inherit runLocal bazelTest distDir; bazel = bazelWithNixHacks; };
+      pythonBinPathWithNixHacks = callPackage ../python-bin-path-test.nix { inherit runLocal bazelTest distDir; bazel = bazelWithNixHacks; };
+
+      # downstream packages using buildBazelPackage
+      # fixed-output hashes of the fetch phase need to be spot-checked manually
+      downstream = recurseIntoAttrs ({
+        inherit bazel-watcher;
+      }
+          # dm-sonnet is only packaged for linux
+      // (lib.optionalAttrs stdenv.isLinux {
+          # TODO(timokau) dm-sonnet is broken currently
+          # dm-sonnet-linux = python3.pkgs.dm-sonnet;
+      }));
+    };
+
+  # update the list of workspace dependencies
+  passthru.updater = writeScript "update-bazel-deps.sh" ''
+    #!${runtimeShell}
+    cat ${runCommand "bazel-deps.json" {} ''
+        ${unzip}/bin/unzip ${src} WORKSPACE
+        ${python3}/bin/python3 ${../update-srcDeps.py} ./WORKSPACE > $out
+    ''} > ${builtins.toString ./src-deps.json}
+  '';
+
+  # Necessary for the tests to pass on Darwin with sandbox enabled.
+  # Bazel starts a local server and needs to bind a local address.
+  __darwinAllowLocalNetworking = true;
+
+  # Bazel expects several utils to be available in Bash even without PATH. Hence this hack.
+  customBash = writeCBin "bash" ''
+    #include <stdio.h>
+    #include <stdlib.h>
+    #include <string.h>
+    #include <unistd.h>
+
+    extern char **environ;
+
+    int main(int argc, char *argv[]) {
+      char *path = getenv("PATH");
+      char *pathToAppend = "${defaultShellPath}";
+      char *newPath;
+      if (path != NULL) {
+        int length = strlen(path) + 1 + strlen(pathToAppend) + 1;
+        newPath = malloc(length * sizeof(char));
+        snprintf(newPath, length, "%s:%s", path, pathToAppend);
+      } else {
+        newPath = pathToAppend;
+      }
+      setenv("PATH", newPath, 1);
+      execve("${bash}/bin/bash", argv, environ);
+      return 0;
+    }
+  '';
+
+  postPatch = let
+
+    darwinPatches = ''
+      bazelLinkFlags () {
+        eval set -- "$NIX_LDFLAGS"
+        local flag
+        for flag in "$@"; do
+          printf ' -Wl,%s' "$flag"
+        done
+      }
+
+      # Disable Bazel's Xcode toolchain detection which would configure compilers
+      # and linkers from Xcode instead of from PATH
+      export BAZEL_USE_CPP_ONLY_TOOLCHAIN=1
+
+      # Explicitly configure gcov since we don't have it on Darwin, so autodetection fails
+      export GCOV=${coreutils}/bin/false
+
+      # Framework search paths aren't added by bintools hook
+      # https://github.com/NixOS/nixpkgs/pull/41914
+      export NIX_LDFLAGS+=" -F${CoreFoundation}/Library/Frameworks -F${CoreServices}/Library/Frameworks -F${Foundation}/Library/Frameworks"
+
+      # libcxx includes aren't added by libcxx hook
+      # https://github.com/NixOS/nixpkgs/pull/41589
+      export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -isystem ${llvmPackages_8.libcxx}/include/c++/v1"
+
+      # don't use system installed Xcode to run clang, use Nix clang instead
+      sed -i -E "s;/usr/bin/xcrun (--sdk macosx )?clang;${stdenv'.cc}/bin/clang $NIX_CFLAGS_COMPILE $(bazelLinkFlags) -framework CoreFoundation;g" \
+        scripts/bootstrap/compile.sh \
+        src/tools/xcode/realpath/BUILD \
+        src/tools/xcode/stdredirect/BUILD \
+        tools/osx/BUILD
+
+      # nixpkgs's libSystem cannot use pthread headers directly, must import GCD headers instead
+      sed -i -e "/#include <pthread\/spawn.h>/i #include <dispatch/dispatch.h>" src/main/cpp/blaze_util_darwin.cc
+
+      # clang installed from Xcode has a compatibility wrapper that forwards
+      # invocations of gcc to clang, but vanilla clang doesn't
+      sed -i -e 's;_find_generic(repository_ctx, "gcc", "CC", overriden_tools);_find_generic(repository_ctx, "clang", "CC", overriden_tools);g' tools/cpp/unix_cc_configure.bzl
+
+      sed -i -e 's;/usr/bin/libtool;${cctools}/bin/libtool;g' tools/cpp/unix_cc_configure.bzl
+      wrappers=( tools/cpp/osx_cc_wrapper.sh tools/cpp/osx_cc_wrapper.sh.tpl )
+      for wrapper in "''${wrappers[@]}"; do
+        sed -i -e "s,/usr/bin/install_name_tool,${cctools}/bin/install_name_tool,g" $wrapper
+      done
+    '';
+
+    genericPatches = ''
+      # Substitute j2objc and objc wrapper's python shebang to plain python path.
+      # These scripts explicitly depend on Python 2.7, hence we use python27.
+      # See also `postFixup` where python27 is added to $out/nix-support
+      substituteInPlace tools/j2objc/j2objc_header_map.py --replace "$!/usr/bin/python2.7" "#!${python27}/bin/python"
+      substituteInPlace tools/j2objc/j2objc_wrapper.py --replace "$!/usr/bin/python2.7" "#!${python27}/bin/python"
+      substituteInPlace tools/objc/j2objc_dead_code_pruner.py --replace "$!/usr/bin/python2.7" "#!${python27}/bin/python"
+
+      # md5sum is part of coreutils
+      sed -i 's|/sbin/md5|md5sum|' \
+        src/BUILD
+
+      # substituteInPlace is rather slow, so prefilter the files with grep
+      grep -rlZ /bin src/main/java/com/google/devtools | while IFS="" read -r -d "" path; do
+        # If you add more replacements here, you must change the grep above!
+        # Only files containing /bin are taken into account.
+        # We default to python3 where possible. See also `postFixup` where
+        # python3 is added to $out/nix-support
+        substituteInPlace "$path" \
+          --replace /bin/bash ${customBash}/bin/bash \
+          --replace "/usr/bin/env bash" ${customBash}/bin/bash \
+          --replace "/usr/bin/env python" ${python3}/bin/python \
+          --replace /usr/bin/env ${coreutils}/bin/env \
+          --replace /bin/true ${coreutils}/bin/true
+      done
+
+      # bazel test runner include references to /bin/bash
+      substituteInPlace tools/build_rules/test_rules.bzl \
+        --replace /bin/bash ${customBash}/bin/bash
+
+      for i in $(find tools/cpp/ -type f)
+      do
+        substituteInPlace $i \
+          --replace /bin/bash ${customBash}/bin/bash
+      done
+
+      # Fixup scripts that generate scripts. Not fixed up by patchShebangs below.
+      substituteInPlace scripts/bootstrap/compile.sh \
+          --replace /bin/bash ${customBash}/bin/bash
+
+      # add nix environment vars to .bazelrc
+      cat >> .bazelrc <<EOF
+      build --distdir=${distDir}
+      fetch --distdir=${distDir}
+      build --copt="$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --copt="/g')"
+      build --host_copt="$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --host_copt="/g')"
+      build --linkopt="$(echo $(< ${stdenv'.cc}/nix-support/libcxx-ldflags) | sed -e 's/ /" --linkopt="/g')"
+      build --host_linkopt="$(echo $(< ${stdenv'.cc}/nix-support/libcxx-ldflags) | sed -e 's/ /" --host_linkopt="/g')"
+      build --linkopt="-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --linkopt="-Wl,/g')"
+      build --host_linkopt="-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --host_linkopt="-Wl,/g')"
+      build --host_javabase='@local_jdk//:jdk'
+      build --host_java_toolchain='${javaToolchain}'
+      EOF
+
+      # add the same environment vars to compile.sh
+      sed -e "/\$command \\\\$/a --copt=\"$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --copt=\"/g')\" \\\\" \
+          -e "/\$command \\\\$/a --host_copt=\"$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --host_copt=\"/g')\" \\\\" \
+          -e "/\$command \\\\$/a --linkopt=\"$(echo $(< ${stdenv'.cc}/nix-support/libcxx-ldflags) | sed -e 's/ /" --linkopt=\"/g')\" \\\\" \
+          -e "/\$command \\\\$/a --host_linkopt=\"$(echo $(< ${stdenv'.cc}/nix-support/libcxx-ldflags) | sed -e 's/ /" --host_linkopt=\"/g')\" \\\\" \
+          -e "/\$command \\\\$/a --linkopt=\"-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --linkopt=\"-Wl,/g')\" \\\\" \
+          -e "/\$command \\\\$/a --host_linkopt=\"-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --host_linkopt=\"-Wl,/g')\" \\\\" \
+          -e "/\$command \\\\$/a --host_javabase='@local_jdk//:jdk' \\\\" \
+          -e "/\$command \\\\$/a --host_java_toolchain='${javaToolchain}' \\\\" \
+          -i scripts/bootstrap/compile.sh
+
+      # This is necessary to avoid:
+      # "error: no visible @interface for 'NSDictionary' declares the selector
+      # 'initWithContentsOfURL:error:'"
+      # This can be removed when the apple_sdk is upgraded beyond 10.13+
+      sed -i '/initWithContentsOfURL:versionPlistUrl/ {
+        N
+        s/error:nil\];/\];/
+      }' tools/osx/xcode_locator.m
+
+      # append the PATH with defaultShellPath in tools/bash/runfiles/runfiles.bash
+      echo "PATH=\$PATH:${defaultShellPath}" >> runfiles.bash.tmp
+      cat tools/bash/runfiles/runfiles.bash >> runfiles.bash.tmp
+      mv runfiles.bash.tmp tools/bash/runfiles/runfiles.bash
+
+      patchShebangs .
+    '';
+    in lib.optionalString stdenv.hostPlatform.isDarwin darwinPatches
+     + genericPatches;
+
+  buildInputs = [
+    buildJdk
+    python3
+  ];
+
+  # when a command can’t be found in a bazel build, you might also
+  # need to add it to `defaultShellPath`.
+  nativeBuildInputs = [
+    zip
+    python3
+    unzip
+    makeWrapper
+    which
+    customBash
+  ] ++ lib.optionals (stdenv.isDarwin) [ cctools CoreFoundation CoreServices Foundation ];
+
+  # Bazel makes extensive use of symlinks in the WORKSPACE.
+  # This causes problems with infinite symlinks if the build output is in the same location as the
+  # Bazel WORKSPACE. This is why before executing the build, the source code is moved into a
+  # subdirectory.
+  # Failing to do this causes "infinite symlink expansion detected"
+  preBuildPhases = ["preBuildPhase"];
+  preBuildPhase = ''
+    mkdir bazel_src
+    shopt -s dotglob extglob
+    mv !(bazel_src) bazel_src
+  '';
+
+  buildPhase = ''
+    # Increasing memory during compilation might be necessary.
+    # export BAZEL_JAVAC_OPTS="-J-Xmx2g -J-Xms200m"
+    ./bazel_src/compile.sh
+    ./bazel_src/scripts/generate_bash_completion.sh \
+        --bazel=./bazel_src/output/bazel \
+        --output=./bazel_src/output/bazel-complete.bash \
+        --prepend=./bazel_src/scripts/bazel-complete-header.bash \
+        --prepend=./bazel_src/scripts/bazel-complete-template.bash
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+
+    # official wrapper scripts that searches for $WORKSPACE_ROOT/tools/bazel
+    # if it can’t find something in tools, it calls $out/bin/bazel-real
+    cp ./bazel_src/scripts/packages/bazel.sh $out/bin/bazel
+    mv ./bazel_src/output/bazel $out/bin/bazel-real
+
+    # shell completion files
+    mkdir -p $out/share/bash-completion/completions $out/share/zsh/site-functions
+    mv ./bazel_src/output/bazel-complete.bash $out/share/bash-completion/completions/bazel
+    cp ./bazel_src/scripts/zsh_completion/_bazel $out/share/zsh/site-functions/
+  '';
+
+  doInstallCheck = true;
+  installCheckPhase = ''
+    export TEST_TMPDIR=$(pwd)
+
+    hello_test () {
+      $out/bin/bazel test --distdir=${distDir} \
+        --test_output=errors \
+        --java_toolchain='${javaToolchain}' \
+        examples/cpp:hello-success_test \
+        examples/java-native/src/test/java/com/example/myproject:hello
+    }
+
+    cd ./bazel_src
+
+    # test whether $WORKSPACE_ROOT/tools/bazel works
+
+    mkdir -p tools
+    cat > tools/bazel <<"EOF"
+    #!${runtimeShell} -e
+    exit 1
+    EOF
+    chmod +x tools/bazel
+
+    # first call should fail if tools/bazel is used
+    ! hello_test
+
+    cat > tools/bazel <<"EOF"
+    #!${runtimeShell} -e
+    exec "$BAZEL_REAL" "$@"
+    EOF
+
+    # second call succeeds because it defers to $out/bin/bazel-real
+    hello_test
+  '';
+
+  # Save paths to hardcoded dependencies so Nix can detect them.
+  postFixup = ''
+    mkdir -p $out/nix-support
+    echo "${customBash} ${defaultShellPath}" >> $out/nix-support/depends
+    # The templates get tar’d up into a .jar,
+    # so nix can’t detect python is needed in the runtime closure
+    # Some of the scripts explicitly depend on Python 2.7. Otherwise, we
+    # default to using python3. Therefore, both python27 and python3 are
+    # runtime dependencies.
+    echo "${python27}" >> $out/nix-support/depends
+    echo "${python3}" >> $out/nix-support/depends
+  '' + lib.optionalString stdenv.isDarwin ''
+    echo "${cctools}" >> $out/nix-support/depends
+  '';
+
+  dontStrip = true;
+  dontPatchELF = true;
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_0_29/glibc.patch b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_0_29/glibc.patch
new file mode 100644
index 000000000000..c4de48068f11
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_0_29/glibc.patch
@@ -0,0 +1,78 @@
+From https://github.com/grpc/grpc/commit/57586a1ca7f17b1916aed3dea4ff8de872dbf853
+From: Benjamin Peterson <benjamin@dropbox.com>
+Date: Fri, 3 May 2019 08:11:00 -0700
+Subject: [PATCH] Rename gettid() functions.
+
+glibc 2.30 will declare its own gettid; see https://sourceware.org/git/?p=glibc.git;a=commit;h=1d0fc213824eaa2a8f8c4385daaa698ee8fb7c92. Rename the grpc versions to avoid naming conflicts.
+---
+ src/core/lib/gpr/log_linux.cc          | 6 ++----
+ src/core/lib/gpr/log_posix.cc          | 4 ++--
+ src/core/lib/iomgr/ev_epollex_linux.cc | 4 ++--
+ 3 files changed, 6 insertions(+), 8 deletions(-)
+
+diff --git a/third_party/grpc/src/core/lib/gpr/log_linux.cc b/src/core/lib/gpr/log_linux.cc
+index 81026e5689b..8b597b4cf2f 100644
+--- a/third_party/grpc/src/core/lib/gpr/log_linux.cc
++++ b/third_party/grpc/src/core/lib/gpr/log_linux.cc
+@@ -40,7 +40,7 @@
+ #include <time.h>
+ #include <unistd.h>
+
+-static long gettid(void) { return syscall(__NR_gettid); }
++static long sys_gettid(void) { return syscall(__NR_gettid); }
+
+ void gpr_log(const char* file, int line, gpr_log_severity severity,
+              const char* format, ...) {
+@@ -70,7 +70,7 @@ void gpr_default_log(gpr_log_func_args* args) {
+   gpr_timespec now = gpr_now(GPR_CLOCK_REALTIME);
+   struct tm tm;
+   static __thread long tid = 0;
+-  if (tid == 0) tid = gettid();
++  if (tid == 0) tid = sys_gettid();
+
+   timer = static_cast<time_t>(now.tv_sec);
+   final_slash = strrchr(args->file, '/');
+diff --git a/third_party/grpc/src/core/lib/gpr/log_posix.cc b/src/core/lib/gpr/log_posix.cc
+index b6edc14ab6b..2f7c6ce3760 100644
+--- a/third_party/grpc/src/core/lib/gpr/log_posix.cc
++++ b/third_party/grpc/src/core/lib/gpr/log_posix.cc
+@@ -31,7 +31,7 @@
+ #include <string.h>
+ #include <time.h>
+
+-static intptr_t gettid(void) { return (intptr_t)pthread_self(); }
++static intptr_t sys_gettid(void) { return (intptr_t)pthread_self(); }
+
+ void gpr_log(const char* file, int line, gpr_log_severity severity,
+              const char* format, ...) {
+@@ -86,7 +86,7 @@ void gpr_default_log(gpr_log_func_args* args) {
+   char* prefix;
+   gpr_asprintf(&prefix, "%s%s.%09d %7" PRIdPTR " %s:%d]",
+                gpr_log_severity_string(args->severity), time_buffer,
+-               (int)(now.tv_nsec), gettid(), display_file, args->line);
++               (int)(now.tv_nsec), sys_gettid(), display_file, args->line);
+
+   fprintf(stderr, "%-70s %s\n", prefix, args->message);
+   gpr_free(prefix);
+diff --git a/third_party/grpc/src/core/lib/iomgr/ev_epollex_linux.cc b/src/core/lib/iomgr/ev_epollex_linux.cc
+index c2d80c08ddb..4a83cb6c215 100644
+--- a/third_party/grpc/src/core/lib/iomgr/ev_epollex_linux.cc
++++ b/third_party/grpc/src/core/lib/iomgr/ev_epollex_linux.cc
+@@ -1077,7 +1077,7 @@ static void end_worker(grpc_pollset* pollset, grpc_pollset_worker* worker,
+ }
+
+ #ifndef NDEBUG
+-static long gettid(void) { return syscall(__NR_gettid); }
++static long sys_gettid(void) { return syscall(__NR_gettid); }
+ #endif
+
+ /* pollset->mu lock must be held by the caller before calling this.
+@@ -1097,7 +1097,7 @@ static grpc_error* pollset_work(grpc_pollset* pollset,
+ #define WORKER_PTR (&worker)
+ #endif
+ #ifndef NDEBUG
+-  WORKER_PTR->originator = gettid();
++  WORKER_PTR->originator = sys_gettid();
+ #endif
+   if (GRPC_TRACE_FLAG_ENABLED(grpc_polling_trace)) {
+     gpr_log(GPR_INFO,
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_0_29/src-deps.json b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_0_29/src-deps.json
new file mode 100644
index 000000000000..f93794249ec7
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_0_29/src-deps.json
@@ -0,0 +1,506 @@
+{
+    "0.16.2.zip": {
+        "name": "0.16.2.zip",
+        "sha256": "9b72bb0aea72d7cbcfc82a01b1e25bf3d85f791e790ddec16c65e2d906382ee0",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_nodejs/archive/0.16.2.zip",
+            "https://github.com/bazelbuild/rules_nodejs/archive/0.16.2.zip"
+        ]
+    },
+    "0.27.1.tar.gz": {
+        "name": "0.27.1.tar.gz",
+        "sha256": "28cb3666da80fbc62d4c46814f5468dd5d0b59f9064c0b933eee3140d706d330",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/bazel-toolchains/archive/0.27.1.tar.gz",
+            "https://github.com/bazelbuild/bazel-toolchains/archive/0.27.1.tar.gz"
+        ]
+    },
+    "0d5f3f2768c6ca2faca0079a997a97ce22997a0c.zip": {
+        "name": "0d5f3f2768c6ca2faca0079a997a97ce22997a0c.zip",
+        "sha256": "36fa66d4d49debd71d05fba55c1353b522e8caef4a20f8080a3d17cdda001d89",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_cc/archive/0d5f3f2768c6ca2faca0079a997a97ce22997a0c.zip",
+            "https://github.com/bazelbuild/rules_cc/archive/0d5f3f2768c6ca2faca0079a997a97ce22997a0c.zip"
+        ]
+    },
+    "41c28e43dffbae39c52dd4b91932d1209e5a8893.tar.gz": {
+        "name": "41c28e43dffbae39c52dd4b91932d1209e5a8893.tar.gz",
+        "sha256": "fdc34621839104b57363a258eab9d821b02ff7837923cfe7fb6fd67182780829",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/skydoc/archive/41c28e43dffbae39c52dd4b91932d1209e5a8893.tar.gz",
+            "https://github.com/bazelbuild/skydoc/archive/41c28e43dffbae39c52dd4b91932d1209e5a8893.tar.gz"
+        ]
+    },
+    "441afe1bfdadd6236988e9cac159df6b5a9f5a98.zip": {
+        "name": "441afe1bfdadd6236988e9cac159df6b5a9f5a98.zip",
+        "sha256": "a07fe5e75964361885db725039c2ba673f0ee0313d971ae4f50c9b18cd28b0b5",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/platforms/archive/441afe1bfdadd6236988e9cac159df6b5a9f5a98.zip",
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+        ]
+    },
+    "openjdk_win_vanilla": {
+        "downloaded_file_path": "zulu-win-vanilla.zip",
+        "name": "openjdk_win_vanilla",
+        "sha256": "e1f5b4ce1b9148140fae2fcfb8a96d1c9b7eac5b8df0e13fbcad9b8561284880",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.29.3-ca-jdk11.0.2/zulu11.29.3-ca-jdk11.0.2-win_x64.zip"
+        ]
+    },
+    "platforms": {
+        "name": "platforms",
+        "sha256": "a07fe5e75964361885db725039c2ba673f0ee0313d971ae4f50c9b18cd28b0b5",
+        "strip_prefix": "platforms-441afe1bfdadd6236988e9cac159df6b5a9f5a98",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/platforms/archive/441afe1bfdadd6236988e9cac159df6b5a9f5a98.zip",
+            "https://github.com/bazelbuild/platforms/archive/441afe1bfdadd6236988e9cac159df6b5a9f5a98.zip"
+        ]
+    },
+    "rules_cc": {
+        "name": "rules_cc",
+        "sha256": "36fa66d4d49debd71d05fba55c1353b522e8caef4a20f8080a3d17cdda001d89",
+        "strip_prefix": "rules_cc-0d5f3f2768c6ca2faca0079a997a97ce22997a0c",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_cc/archive/0d5f3f2768c6ca2faca0079a997a97ce22997a0c.zip",
+            "https://github.com/bazelbuild/rules_cc/archive/0d5f3f2768c6ca2faca0079a997a97ce22997a0c.zip"
+        ]
+    },
+    "rules_java": {
+        "name": "rules_java",
+        "sha256": "bc81f1ba47ef5cc68ad32225c3d0e70b8c6f6077663835438da8d5733f917598",
+        "strip_prefix": "rules_java-7cf3cefd652008d0a64a419c34c13bdca6c8f178",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_java/archive/7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip",
+            "https://github.com/bazelbuild/rules_java/archive/7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip"
+        ]
+    },
+    "rules_pkg": {
+        "name": "rules_pkg",
+        "sha256": "5bdc04987af79bd27bc5b00fe30f59a858f77ffa0bd2d8143d5b31ad8b1bd71c",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_pkg/rules_pkg-0.2.0.tar.gz",
+            "https://github.com/bazelbuild/rules_pkg/releases/download/0.2.0/rules_pkg-0.2.0.tar.gz"
+        ]
+    },
+    "rules_pkg-0.2.0.tar.gz": {
+        "name": "rules_pkg-0.2.0.tar.gz",
+        "sha256": "5bdc04987af79bd27bc5b00fe30f59a858f77ffa0bd2d8143d5b31ad8b1bd71c",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_pkg/rules_pkg-0.2.0.tar.gz",
+            "https://github.com/bazelbuild/rules_pkg/releases/download/0.2.0/rules_pkg-0.2.0.tar.gz"
+        ]
+    },
+    "rules_proto": {
+        "name": "rules_proto",
+        "sha256": "88b0a90433866b44bb4450d4c30bc5738b8c4f9c9ba14e9661deb123f56a833d",
+        "strip_prefix": "rules_proto-b0cc14be5da05168b01db282fe93bdf17aa2b9f4",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_proto/archive/b0cc14be5da05168b01db282fe93bdf17aa2b9f4.tar.gz",
+            "https://github.com/bazelbuild/rules_proto/archive/b0cc14be5da05168b01db282fe93bdf17aa2b9f4.tar.gz"
+        ]
+    },
+    "zulu10.2+3-jdk10.0.1-linux_x64-allmodules.tar.gz": {
+        "name": "zulu10.2+3-jdk10.0.1-linux_x64-allmodules.tar.gz",
+        "sha256": "57fad3602e74c79587901d6966d3b54ef32cb811829a2552163185d5064fe9b5",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu10.2+3-jdk10.0.1/zulu10.2+3-jdk10.0.1-linux_x64-allmodules.tar.gz"
+        ]
+    },
+    "zulu10.2+3-jdk10.0.1-macosx_x64-allmodules.tar.gz": {
+        "name": "zulu10.2+3-jdk10.0.1-macosx_x64-allmodules.tar.gz",
+        "sha256": "e669c9a897413d855b550b4e39d79614392e6fb96f494e8ef99a34297d9d85d3",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu10.2+3-jdk10.0.1/zulu10.2+3-jdk10.0.1-macosx_x64-allmodules.tar.gz"
+        ]
+    },
+    "zulu10.2+3-jdk10.0.1-win_x64-allmodules.zip": {
+        "name": "zulu10.2+3-jdk10.0.1-win_x64-allmodules.zip",
+        "sha256": "c39e7700a8d41794d60985df5a20352435196e78ecbc6a2b30df7be8637bffd5",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu10.2+3-jdk10.0.1/zulu10.2+3-jdk10.0.1-win_x64-allmodules.zip"
+        ]
+    },
+    "zulu11.2.3-jdk11.0.1-linux_x64.tar.gz": {
+        "name": "zulu11.2.3-jdk11.0.1-linux_x64.tar.gz",
+        "sha256": "232b1c3511f0d26e92582b7c3cc363be7ac633e371854ca2f2e9f2b50eb72a75",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.2.3-jdk11.0.1/zulu11.2.3-jdk11.0.1-linux_x64.tar.gz"
+        ]
+    },
+    "zulu11.2.3-jdk11.0.1-macosx_x64.tar.gz": {
+        "name": "zulu11.2.3-jdk11.0.1-macosx_x64.tar.gz",
+        "sha256": "1edf366ee821e5db8e348152fcb337b28dfd6bf0f97943c270dcc6747cedb6cb",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.2.3-jdk11.0.1/zulu11.2.3-jdk11.0.1-macosx_x64.tar.gz"
+        ]
+    },
+    "zulu11.2.3-jdk11.0.1-win_x64.zip": {
+        "name": "zulu11.2.3-jdk11.0.1-win_x64.zip",
+        "sha256": "8e1e2b8347de6746f3fd1538840dd643201533ab113abc4ed93678e342d28aa3",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.2.3-jdk11.0.1/zulu11.2.3-jdk11.0.1-win_x64.zip"
+        ]
+    },
+    "zulu11.29.3-ca-jdk11.0.2-linux_x64.tar.gz": {
+        "name": "zulu11.29.3-ca-jdk11.0.2-linux_x64.tar.gz",
+        "sha256": "f3f44b6235508e87b760bf37a49e186cc1fa4e9cd28384c4dbf5a33991921e08",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.29.3-ca-jdk11.0.2/zulu11.29.3-ca-jdk11.0.2-linux_x64.tar.gz"
+        ]
+    },
+    "zulu11.29.3-ca-jdk11.0.2-macosx_x64.zip": {
+        "name": "zulu11.29.3-ca-jdk11.0.2-macosx_x64.zip",
+        "sha256": "059f8e3484bf07b63a8f2820d5f528f473eff1befdb1896ee4f8ff06be3b8d8f",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.29.3-ca-jdk11.0.2/zulu11.29.3-ca-jdk11.0.2-macosx_x64.zip"
+        ]
+    },
+    "zulu11.29.3-ca-jdk11.0.2-win_x64.zip": {
+        "name": "zulu11.29.3-ca-jdk11.0.2-win_x64.zip",
+        "sha256": "e1f5b4ce1b9148140fae2fcfb8a96d1c9b7eac5b8df0e13fbcad9b8561284880",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.29.3-ca-jdk11.0.2/zulu11.29.3-ca-jdk11.0.2-win_x64.zip"
+        ]
+    },
+    "zulu11.31.15-ca-jdk11.0.3-linux_aarch64.tar.gz": {
+        "name": "zulu11.31.15-ca-jdk11.0.3-linux_aarch64.tar.gz",
+        "sha256": "3b0d91611b1bdc4d409afcf9eab4f0e7f4ae09f88fc01bd9f2b48954882ae69b",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.31.15-ca-jdk11.0.3/zulu11.31.15-ca-jdk11.0.3-linux_aarch64.tar.gz"
+        ]
+    },
+    "zulu9.0.7.1-jdk9.0.7-linux_x64-allmodules.tar.gz": {
+        "name": "zulu9.0.7.1-jdk9.0.7-linux_x64-allmodules.tar.gz",
+        "sha256": "f27cb933de4f9e7fe9a703486cf44c84bc8e9f138be0c270c9e5716a32367e87",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu-9.0.7.1-jdk9.0.7/zulu9.0.7.1-jdk9.0.7-linux_x64-allmodules.tar.gz"
+        ]
+    },
+    "zulu9.0.7.1-jdk9.0.7-macosx_x64-allmodules.tar.gz": {
+        "name": "zulu9.0.7.1-jdk9.0.7-macosx_x64-allmodules.tar.gz",
+        "sha256": "404e7058ff91f956612f47705efbee8e175a38b505fb1b52d8c1ea98718683de",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu-9.0.7.1-jdk9.0.7/zulu9.0.7.1-jdk9.0.7-macosx_x64-allmodules.tar.gz"
+        ]
+    },
+    "zulu9.0.7.1-jdk9.0.7-win_x64-allmodules.zip": {
+        "name": "zulu9.0.7.1-jdk9.0.7-win_x64-allmodules.zip",
+        "sha256": "e738829017f107e7a7cd5069db979398ec3c3f03ef56122f89ba38e7374f63ed",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu-9.0.7.1-jdk9.0.7/zulu9.0.7.1-jdk9.0.7-win_x64-allmodules.zip"
+        ]
+    }
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_1/default.nix b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_1/default.nix
new file mode 100644
index 000000000000..5eb0926503c8
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_1/default.nix
@@ -0,0 +1,565 @@
+{ stdenv, callPackage, lib, fetchurl, fetchFromGitHub
+, runCommand, runCommandCC, makeWrapper, recurseIntoAttrs
+# this package (through the fixpoint glass)
+, bazel_self
+, lr, xe, zip, unzip, bash, writeCBin, coreutils
+, which, gawk, gnused, gnutar, gnugrep, gzip, findutils
+# updater
+, python27, python3, writeScript
+# Apple dependencies
+, cctools, llvmPackages_8, CoreFoundation, CoreServices, Foundation
+# Allow to independently override the jdks used to build and run respectively
+, buildJdk, runJdk
+, buildJdkName
+, runtimeShell
+# Downstream packages for tests
+, bazel-watcher
+# Always assume all markers valid (this is needed because we remove markers; they are non-deterministic).
+# Also, don't clean up environment variables (so that NIX_ environment variables are passed to compilers).
+, enableNixHacks ? false
+, gcc-unwrapped
+, autoPatchelfHook
+, file
+, substituteAll
+, writeTextFile
+}:
+
+let
+  version = "1.2.1";
+
+  src = fetchurl {
+    url = "https://github.com/bazelbuild/bazel/releases/download/${version}/bazel-${version}-dist.zip";
+    sha256 = "1qfk14mgx1m454b4w4ldggljzqkqwpdwrlynq7rc8aq11yfs8p95";
+  };
+
+  # Update with `eval $(nix-build -A bazel.updater)`,
+  # then add new dependencies from the dict in ./src-deps.json as required.
+  srcDeps = lib.attrsets.attrValues srcDepsSet;
+  srcDepsSet =
+    let
+      srcs = (builtins.fromJSON (builtins.readFile ./src-deps.json));
+      toFetchurl = d: lib.attrsets.nameValuePair d.name (fetchurl {
+        urls = d.urls;
+        sha256 = d.sha256;
+        });
+        in builtins.listToAttrs (map toFetchurl [
+      srcs.desugar_jdk_libs
+      srcs.io_bazel_skydoc
+      srcs.bazel_skylib
+      srcs.io_bazel_rules_sass
+      srcs.platforms
+      (if stdenv.hostPlatform.isDarwin
+       then srcs."java_tools_javac11_darwin-v6.1.zip"
+       else srcs."java_tools_javac11_linux-v6.1.zip")
+      srcs."coverage_output_generator-v2.0.zip"
+      srcs.build_bazel_rules_nodejs
+      srcs."android_tools_pkg-0.12.tar.gz"
+      srcs."0.28.3.tar.gz"
+      srcs.rules_pkg
+      srcs.rules_cc
+      srcs.rules_java
+      srcs.rules_proto
+      ]);
+
+  distDir = runCommand "bazel-deps" {} ''
+    mkdir -p $out
+    for i in ${builtins.toString srcDeps}; do cp $i $out/$(stripHash $i); done
+  '';
+
+  defaultShellPath = lib.makeBinPath
+    # Keep this list conservative. For more exotic tools, prefer to use
+    # @rules_nixpkgs to pull in tools from the nix repository. Example:
+    #
+    # WORKSPACE:
+    #
+    #     nixpkgs_git_repository(
+    #         name = "nixpkgs",
+    #         revision = "def5124ec8367efdba95a99523dd06d918cb0ae8",
+    #     )
+    #
+    #     # This defines an external Bazel workspace.
+    #     nixpkgs_package(
+    #         name = "bison",
+    #         repositories = { "nixpkgs": "@nixpkgs//:default.nix" },
+    #     )
+    #
+    # some/BUILD.bazel:
+    #
+    #     genrule(
+    #        ...
+    #        cmd = "$(location @bison//:bin/bison) -other -args",
+    #        tools = [
+    #            ...
+    #            "@bison//:bin/bison",
+    #        ],
+    #     )
+    #
+    [ bash coreutils findutils gawk gnugrep gnutar gnused gzip which unzip file zip ];
+
+  # Java toolchain used for the build and tests
+  javaToolchain = "@bazel_tools//tools/jdk:toolchain_host${buildJdkName}";
+
+  platforms = lib.platforms.linux ++ lib.platforms.darwin;
+
+  # This repository is fetched by bazel at runtime
+  # however it contains prebuilt java binaries, with wrong interpreter
+  # and libraries path.
+  # We prefetch it, patch it, and override it in a global bazelrc.
+  system = if stdenv.hostPlatform.isDarwin then "darwin" else "linux";
+
+  remote_java_tools = stdenv.mkDerivation {
+    name = "remote_java_tools_${system}";
+
+    src = srcDepsSet."java_tools_javac11_${system}-v6.1.zip";
+
+    nativeBuildInputs = [ autoPatchelfHook unzip ];
+    buildInputs = [ gcc-unwrapped ];
+
+    sourceRoot = ".";
+
+    buildPhase = ''
+      mkdir $out;
+    '';
+
+    installPhase = ''
+      cp -Ra * $out/
+      touch $out/WORKSPACE
+    '';
+  };
+
+  bazelRC = writeTextFile {
+    name = "bazel-rc";
+    text = ''
+      build --override_repository=${remote_java_tools.name}=${remote_java_tools}
+      build --distdir=${distDir}
+      startup --server_javabase=${runJdk}
+
+      # load default location for the system wide configuration
+      try-import /etc/bazel.bazelrc
+    '';
+  };
+
+  stdenv' = if stdenv.isDarwin then llvmPackages_8.libcxxStdenv else stdenv;
+
+in
+stdenv'.mkDerivation rec {
+  pname = "bazel";
+  inherit version;
+
+  meta = with lib; {
+    homepage = "https://github.com/bazelbuild/bazel/";
+    description = "Build tool that builds code quickly and reliably";
+    license = licenses.asl20;
+    maintainers = [ maintainers.mboes ];
+    inherit platforms;
+  };
+
+  inherit src;
+  sourceRoot = ".";
+
+  patches = [
+    # On Darwin, the last argument to gcc is coming up as an empty string. i.e: ''
+    # This is breaking the build of any C target. This patch removes the last
+    # argument if it's found to be an empty string.
+    ../trim-last-argument-to-gcc-if-empty.patch
+    ./glibc.patch
+
+    # --experimental_strict_action_env (which may one day become the default
+    # see bazelbuild/bazel#2574) hardcodes the default
+    # action environment to a non hermetic value (e.g. "/usr/local/bin").
+    # This is non hermetic on non-nixos systems. On NixOS, bazel cannot find the required binaries.
+    # So we are replacing this bazel paths by defaultShellPath,
+    # improving hermeticity and making it work in nixos.
+    (substituteAll {
+      src = ../strict_action_env.patch;
+      strictActionEnvPatch = defaultShellPath;
+    })
+
+    # bazel reads its system bazelrc in /etc
+    # override this path to a builtin one
+    (substituteAll {
+      src = ../bazel_rc.patch;
+      bazelSystemBazelRCPath = bazelRC;
+    })
+  ] ++ lib.optional enableNixHacks ../nix-hacks.patch;
+
+
+  # Additional tests that check bazel’s functionality. Execute
+  #
+  #     nix-build . -A bazel.tests
+  #
+  # in the nixpkgs checkout root to exercise them locally.
+  passthru.tests =
+    let
+      runLocal = name: attrs: script:
+      let
+        attrs' = removeAttrs attrs [ "buildInputs" ];
+        buildInputs = [ python3 ] ++ (attrs.buildInputs or []);
+      in
+      runCommandCC name ({
+        inherit buildInputs;
+        preferLocalBuild = true;
+        meta.platforms = platforms;
+      } // attrs') script;
+
+      # bazel wants to extract itself into $install_dir/install every time it runs,
+      # so let’s do that only once.
+      extracted = bazelPkg:
+        let install_dir =
+          # `install_base` field printed by `bazel info`, minus the hash.
+          # yes, this path is kinda magic. Sorry.
+          "$HOME/.cache/bazel/_bazel_nixbld";
+        in runLocal "bazel-extracted-homedir" { passthru.install_dir = install_dir; } ''
+            export HOME=$(mktemp -d)
+            touch WORKSPACE # yeah, everything sucks
+            install_base="$(${bazelPkg}/bin/bazel info | grep install_base)"
+            # assert it’s actually below install_dir
+            [[ "$install_base" =~ ${install_dir} ]] \
+              || (echo "oh no! $install_base but we are \
+            trying to copy ${install_dir} to $out instead!"; exit 1)
+            cp -R ${install_dir} $out
+          '';
+
+      bazelTest = { name, bazelScript, workspaceDir, bazelPkg, buildInputs ? [] }:
+        let
+          be = extracted bazelPkg;
+        in runLocal name { inherit buildInputs; } (
+          # skip extraction caching on Darwin, because nobody knows how Darwin works
+          (lib.optionalString (!stdenv.hostPlatform.isDarwin) ''
+            # set up home with pre-unpacked bazel
+            export HOME=$(mktemp -d)
+            mkdir -p ${be.install_dir}
+            cp -R ${be}/install ${be.install_dir}
+
+            # https://stackoverflow.com/questions/47775668/bazel-how-to-skip-corrupt-installation-on-centos6
+            # Bazel checks whether the mtime of the install dir files
+            # is >9 years in the future, otherwise it extracts itself again.
+            # see PosixFileMTime::IsUntampered in src/main/cpp/util
+            # What the hell bazel.
+            ${lr}/bin/lr -0 -U ${be.install_dir} | ${xe}/bin/xe -N0 -0 touch --date="9 years 6 months" {}
+          '')
+          +
+          ''
+            # Note https://github.com/bazelbuild/bazel/issues/5763#issuecomment-456374609
+            # about why to create a subdir for the workspace.
+            cp -r ${workspaceDir} wd && chmod u+w wd && cd wd
+
+            ${bazelScript}
+
+            touch $out
+          '');
+
+      bazelWithNixHacks = bazel_self.override { enableNixHacks = true; };
+
+      bazel-examples = fetchFromGitHub {
+        owner = "bazelbuild";
+        repo = "examples";
+        rev = "5d8c8961a2516ebf875787df35e98cadd08d43dc";
+        sha256 = "03c1bwlq5bs3hg96v4g4pg2vqwhqq6w538h66rcpw02f83yy7fs8";
+      };
+
+    in (if !stdenv.hostPlatform.isDarwin then {
+      # `extracted` doesn’t work on darwin
+      shebang = callPackage ../shebang-test.nix { inherit runLocal extracted bazelTest distDir; };
+    } else {}) // {
+      bashTools = callPackage ../bash-tools-test.nix { inherit runLocal bazelTest distDir; };
+      cpp = callPackage ../cpp-test.nix { inherit runLocal bazelTest bazel-examples distDir; };
+      java = callPackage ../java-test.nix { inherit runLocal bazelTest bazel-examples distDir; };
+      protobuf = callPackage ../protobuf-test.nix { inherit runLocal bazelTest distDir; };
+      pythonBinPath = callPackage ../python-bin-path-test.nix { inherit runLocal bazelTest distDir; };
+
+      bashToolsWithNixHacks = callPackage ../bash-tools-test.nix { inherit runLocal bazelTest distDir; bazel = bazelWithNixHacks; };
+
+      cppWithNixHacks = callPackage ../cpp-test.nix { inherit runLocal bazelTest bazel-examples distDir; bazel = bazelWithNixHacks; };
+      javaWithNixHacks = callPackage ../java-test.nix { inherit runLocal bazelTest bazel-examples distDir; bazel = bazelWithNixHacks; };
+      protobufWithNixHacks = callPackage ../protobuf-test.nix { inherit runLocal bazelTest distDir; bazel = bazelWithNixHacks; };
+      pythonBinPathWithNixHacks = callPackage ../python-bin-path-test.nix { inherit runLocal bazelTest distDir; bazel = bazelWithNixHacks; };
+
+      # downstream packages using buildBazelPackage
+      # fixed-output hashes of the fetch phase need to be spot-checked manually
+      downstream = recurseIntoAttrs ({
+        inherit bazel-watcher;
+      }
+          # dm-sonnet is only packaged for linux
+      // (lib.optionalAttrs stdenv.isLinux {
+          # TODO(timokau) dm-sonnet is broken currently
+          # dm-sonnet-linux = python3.pkgs.dm-sonnet;
+      }));
+    };
+
+  # update the list of workspace dependencies
+  passthru.updater = writeScript "update-bazel-deps.sh" ''
+    #!${runtimeShell}
+    cat ${runCommand "bazel-deps.json" {} ''
+        ${unzip}/bin/unzip ${src} WORKSPACE
+        ${python3}/bin/python3 ${../update-srcDeps.py} ./WORKSPACE > $out
+    ''} > ${builtins.toString ./src-deps.json}
+  '';
+
+  # Necessary for the tests to pass on Darwin with sandbox enabled.
+  # Bazel starts a local server and needs to bind a local address.
+  __darwinAllowLocalNetworking = true;
+
+  # Bazel expects several utils to be available in Bash even without PATH. Hence this hack.
+  customBash = writeCBin "bash" ''
+    #include <stdio.h>
+    #include <stdlib.h>
+    #include <string.h>
+    #include <unistd.h>
+
+    extern char **environ;
+
+    int main(int argc, char *argv[]) {
+      char *path = getenv("PATH");
+      char *pathToAppend = "${defaultShellPath}";
+      char *newPath;
+      if (path != NULL) {
+        int length = strlen(path) + 1 + strlen(pathToAppend) + 1;
+        newPath = malloc(length * sizeof(char));
+        snprintf(newPath, length, "%s:%s", path, pathToAppend);
+      } else {
+        newPath = pathToAppend;
+      }
+      setenv("PATH", newPath, 1);
+      execve("${bash}/bin/bash", argv, environ);
+      return 0;
+    }
+  '';
+
+  postPatch = let
+
+    darwinPatches = ''
+      bazelLinkFlags () {
+        eval set -- "$NIX_LDFLAGS"
+        local flag
+        for flag in "$@"; do
+          printf ' -Wl,%s' "$flag"
+        done
+      }
+
+      # Disable Bazel's Xcode toolchain detection which would configure compilers
+      # and linkers from Xcode instead of from PATH
+      export BAZEL_USE_CPP_ONLY_TOOLCHAIN=1
+
+      # Explicitly configure gcov since we don't have it on Darwin, so autodetection fails
+      export GCOV=${coreutils}/bin/false
+
+      # Framework search paths aren't added by bintools hook
+      # https://github.com/NixOS/nixpkgs/pull/41914
+      export NIX_LDFLAGS+=" -F${CoreFoundation}/Library/Frameworks -F${CoreServices}/Library/Frameworks -F${Foundation}/Library/Frameworks"
+
+      # libcxx includes aren't added by libcxx hook
+      # https://github.com/NixOS/nixpkgs/pull/41589
+      export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -isystem ${llvmPackages_8.libcxx}/include/c++/v1"
+
+      # don't use system installed Xcode to run clang, use Nix clang instead
+      sed -i -E "s;/usr/bin/xcrun --sdk macosx clang -mmacosx-version-min=10.9;${stdenv'.cc}/bin/clang $NIX_CFLAGS_COMPILE $(bazelLinkFlags) -framework CoreFoundation;g" \
+        scripts/bootstrap/compile.sh \
+        src/tools/xcode/realpath/BUILD \
+        src/tools/xcode/stdredirect/BUILD \
+        tools/osx/BUILD
+
+      # nixpkgs's libSystem cannot use pthread headers directly, must import GCD headers instead
+      sed -i -e "/#include <pthread\/spawn.h>/i #include <dispatch/dispatch.h>" src/main/cpp/blaze_util_darwin.cc
+
+      # clang installed from Xcode has a compatibility wrapper that forwards
+      # invocations of gcc to clang, but vanilla clang doesn't
+      sed -i -e 's;_find_generic(repository_ctx, "gcc", "CC", overriden_tools);_find_generic(repository_ctx, "clang", "CC", overriden_tools);g' tools/cpp/unix_cc_configure.bzl
+
+      sed -i -e 's;/usr/bin/libtool;${cctools}/bin/libtool;g' tools/cpp/unix_cc_configure.bzl
+      wrappers=( tools/cpp/osx_cc_wrapper.sh tools/cpp/osx_cc_wrapper.sh.tpl )
+      for wrapper in "''${wrappers[@]}"; do
+        sed -i -e "s,/usr/bin/install_name_tool,${cctools}/bin/install_name_tool,g" $wrapper
+      done
+    '';
+
+    genericPatches = ''
+      # Substitute j2objc and objc wrapper's python shebang to plain python path.
+      # These scripts explicitly depend on Python 2.7, hence we use python27.
+      # See also `postFixup` where python27 is added to $out/nix-support
+      substituteInPlace tools/j2objc/j2objc_header_map.py --replace "$!/usr/bin/python2.7" "#!${python27}/bin/python"
+      substituteInPlace tools/j2objc/j2objc_wrapper.py --replace "$!/usr/bin/python2.7" "#!${python27}/bin/python"
+      substituteInPlace tools/objc/j2objc_dead_code_pruner.py --replace "$!/usr/bin/python2.7" "#!${python27}/bin/python"
+
+      # md5sum is part of coreutils
+      sed -i 's|/sbin/md5|md5sum|g' \
+        src/BUILD
+
+      # substituteInPlace is rather slow, so prefilter the files with grep
+      grep -rlZ /bin src/main/java/com/google/devtools | while IFS="" read -r -d "" path; do
+        # If you add more replacements here, you must change the grep above!
+        # Only files containing /bin are taken into account.
+        # We default to python3 where possible. See also `postFixup` where
+        # python3 is added to $out/nix-support
+        substituteInPlace "$path" \
+          --replace /bin/bash ${customBash}/bin/bash \
+          --replace "/usr/bin/env bash" ${customBash}/bin/bash \
+          --replace "/usr/bin/env python" ${python3}/bin/python \
+          --replace /usr/bin/env ${coreutils}/bin/env \
+          --replace /bin/true ${coreutils}/bin/true
+      done
+
+      # bazel test runner include references to /bin/bash
+      substituteInPlace tools/build_rules/test_rules.bzl \
+        --replace /bin/bash ${customBash}/bin/bash
+
+      for i in $(find tools/cpp/ -type f)
+      do
+        substituteInPlace $i \
+          --replace /bin/bash ${customBash}/bin/bash
+      done
+
+      # Fixup scripts that generate scripts. Not fixed up by patchShebangs below.
+      substituteInPlace scripts/bootstrap/compile.sh \
+          --replace /bin/bash ${customBash}/bin/bash
+
+      # add nix environment vars to .bazelrc
+      cat >> .bazelrc <<EOF
+      build --distdir=${distDir}
+      fetch --distdir=${distDir}
+      build --copt="$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --copt="/g')"
+      build --host_copt="$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --host_copt="/g')"
+      build --linkopt="$(echo $(< ${stdenv'.cc}/nix-support/libcxx-ldflags) | sed -e 's/ /" --linkopt="/g')"
+      build --host_linkopt="$(echo $(< ${stdenv'.cc}/nix-support/libcxx-ldflags) | sed -e 's/ /" --host_linkopt="/g')"
+      build --linkopt="-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --linkopt="-Wl,/g')"
+      build --host_linkopt="-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --host_linkopt="-Wl,/g')"
+      build --host_javabase='@local_jdk//:jdk'
+      build --host_java_toolchain='${javaToolchain}'
+      EOF
+
+      # add the same environment vars to compile.sh
+      sed -e "/\$command \\\\$/a --copt=\"$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --copt=\"/g')\" \\\\" \
+          -e "/\$command \\\\$/a --host_copt=\"$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --host_copt=\"/g')\" \\\\" \
+          -e "/\$command \\\\$/a --linkopt=\"$(echo $(< ${stdenv'.cc}/nix-support/libcxx-ldflags) | sed -e 's/ /" --linkopt=\"/g')\" \\\\" \
+          -e "/\$command \\\\$/a --host_linkopt=\"$(echo $(< ${stdenv'.cc}/nix-support/libcxx-ldflags) | sed -e 's/ /" --host_linkopt=\"/g')\" \\\\" \
+          -e "/\$command \\\\$/a --linkopt=\"-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --linkopt=\"-Wl,/g')\" \\\\" \
+          -e "/\$command \\\\$/a --host_linkopt=\"-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --host_linkopt=\"-Wl,/g')\" \\\\" \
+          -e "/\$command \\\\$/a --host_javabase='@local_jdk//:jdk' \\\\" \
+          -e "/\$command \\\\$/a --host_java_toolchain='${javaToolchain}' \\\\" \
+          -i scripts/bootstrap/compile.sh
+
+      # This is necessary to avoid:
+      # "error: no visible @interface for 'NSDictionary' declares the selector
+      # 'initWithContentsOfURL:error:'"
+      # This can be removed when the apple_sdk is upgraded beyond 10.13+
+      sed -i '/initWithContentsOfURL:versionPlistUrl/ {
+        N
+        s/error:nil\];/\];/
+      }' tools/osx/xcode_locator.m
+
+      # append the PATH with defaultShellPath in tools/bash/runfiles/runfiles.bash
+      echo "PATH=\$PATH:${defaultShellPath}" >> runfiles.bash.tmp
+      cat tools/bash/runfiles/runfiles.bash >> runfiles.bash.tmp
+      mv runfiles.bash.tmp tools/bash/runfiles/runfiles.bash
+
+      patchShebangs .
+    '';
+    in lib.optionalString stdenv.hostPlatform.isDarwin darwinPatches
+     + genericPatches;
+
+  buildInputs = [
+    buildJdk
+    python3
+  ];
+
+  # when a command can’t be found in a bazel build, you might also
+  # need to add it to `defaultShellPath`.
+  nativeBuildInputs = [
+    zip
+    python3
+    unzip
+    makeWrapper
+    which
+    customBash
+  ] ++ lib.optionals (stdenv.isDarwin) [ cctools CoreFoundation CoreServices Foundation ];
+
+  # Bazel makes extensive use of symlinks in the WORKSPACE.
+  # This causes problems with infinite symlinks if the build output is in the same location as the
+  # Bazel WORKSPACE. This is why before executing the build, the source code is moved into a
+  # subdirectory.
+  # Failing to do this causes "infinite symlink expansion detected"
+  preBuildPhases = ["preBuildPhase"];
+  preBuildPhase = ''
+    mkdir bazel_src
+    shopt -s dotglob extglob
+    mv !(bazel_src) bazel_src
+  '';
+
+  buildPhase = ''
+    # Increasing memory during compilation might be necessary.
+    # export BAZEL_JAVAC_OPTS="-J-Xmx2g -J-Xms200m"
+    ./bazel_src/compile.sh
+    ./bazel_src/scripts/generate_bash_completion.sh \
+        --bazel=./bazel_src/output/bazel \
+        --output=./bazel_src/output/bazel-complete.bash \
+        --prepend=./bazel_src/scripts/bazel-complete-header.bash \
+        --prepend=./bazel_src/scripts/bazel-complete-template.bash
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+
+    # official wrapper scripts that searches for $WORKSPACE_ROOT/tools/bazel
+    # if it can’t find something in tools, it calls $out/bin/bazel-real
+    cp ./bazel_src/scripts/packages/bazel.sh $out/bin/bazel
+    mv ./bazel_src/output/bazel $out/bin/bazel-real
+
+    # shell completion files
+    mkdir -p $out/share/bash-completion/completions $out/share/zsh/site-functions
+    mv ./bazel_src/output/bazel-complete.bash $out/share/bash-completion/completions/bazel
+    cp ./bazel_src/scripts/zsh_completion/_bazel $out/share/zsh/site-functions/
+  '';
+
+  doInstallCheck = true;
+  installCheckPhase = ''
+    export TEST_TMPDIR=$(pwd)
+
+    hello_test () {
+      $out/bin/bazel test --distdir=${distDir} \
+        --test_output=errors \
+        --java_toolchain='${javaToolchain}' \
+        examples/cpp:hello-success_test \
+        examples/java-native/src/test/java/com/example/myproject:hello
+    }
+
+    cd ./bazel_src
+
+    # test whether $WORKSPACE_ROOT/tools/bazel works
+
+    mkdir -p tools
+    cat > tools/bazel <<"EOF"
+    #!${runtimeShell} -e
+    exit 1
+    EOF
+    chmod +x tools/bazel
+
+    # first call should fail if tools/bazel is used
+    ! hello_test
+
+    cat > tools/bazel <<"EOF"
+    #!${runtimeShell} -e
+    exec "$BAZEL_REAL" "$@"
+    EOF
+
+    # second call succeeds because it defers to $out/bin/bazel-real
+    hello_test
+  '';
+
+  # Save paths to hardcoded dependencies so Nix can detect them.
+  postFixup = ''
+    mkdir -p $out/nix-support
+    echo "${customBash} ${defaultShellPath}" >> $out/nix-support/depends
+    # The templates get tar’d up into a .jar,
+    # so nix can’t detect python is needed in the runtime closure
+    # Some of the scripts explicitly depend on Python 2.7. Otherwise, we
+    # default to using python3. Therefore, both python27 and python3 are
+    # runtime dependencies.
+    echo "${python27}" >> $out/nix-support/depends
+    echo "${python3}" >> $out/nix-support/depends
+  '' + lib.optionalString stdenv.isDarwin ''
+    echo "${cctools}" >> $out/nix-support/depends
+  '';
+
+  dontStrip = true;
+  dontPatchELF = true;
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_1/glibc.patch b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_1/glibc.patch
new file mode 100644
index 000000000000..c4de48068f11
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_1/glibc.patch
@@ -0,0 +1,78 @@
+From https://github.com/grpc/grpc/commit/57586a1ca7f17b1916aed3dea4ff8de872dbf853
+From: Benjamin Peterson <benjamin@dropbox.com>
+Date: Fri, 3 May 2019 08:11:00 -0700
+Subject: [PATCH] Rename gettid() functions.
+
+glibc 2.30 will declare its own gettid; see https://sourceware.org/git/?p=glibc.git;a=commit;h=1d0fc213824eaa2a8f8c4385daaa698ee8fb7c92. Rename the grpc versions to avoid naming conflicts.
+---
+ src/core/lib/gpr/log_linux.cc          | 6 ++----
+ src/core/lib/gpr/log_posix.cc          | 4 ++--
+ src/core/lib/iomgr/ev_epollex_linux.cc | 4 ++--
+ 3 files changed, 6 insertions(+), 8 deletions(-)
+
+diff --git a/third_party/grpc/src/core/lib/gpr/log_linux.cc b/src/core/lib/gpr/log_linux.cc
+index 81026e5689b..8b597b4cf2f 100644
+--- a/third_party/grpc/src/core/lib/gpr/log_linux.cc
++++ b/third_party/grpc/src/core/lib/gpr/log_linux.cc
+@@ -40,7 +40,7 @@
+ #include <time.h>
+ #include <unistd.h>
+
+-static long gettid(void) { return syscall(__NR_gettid); }
++static long sys_gettid(void) { return syscall(__NR_gettid); }
+
+ void gpr_log(const char* file, int line, gpr_log_severity severity,
+              const char* format, ...) {
+@@ -70,7 +70,7 @@ void gpr_default_log(gpr_log_func_args* args) {
+   gpr_timespec now = gpr_now(GPR_CLOCK_REALTIME);
+   struct tm tm;
+   static __thread long tid = 0;
+-  if (tid == 0) tid = gettid();
++  if (tid == 0) tid = sys_gettid();
+
+   timer = static_cast<time_t>(now.tv_sec);
+   final_slash = strrchr(args->file, '/');
+diff --git a/third_party/grpc/src/core/lib/gpr/log_posix.cc b/src/core/lib/gpr/log_posix.cc
+index b6edc14ab6b..2f7c6ce3760 100644
+--- a/third_party/grpc/src/core/lib/gpr/log_posix.cc
++++ b/third_party/grpc/src/core/lib/gpr/log_posix.cc
+@@ -31,7 +31,7 @@
+ #include <string.h>
+ #include <time.h>
+
+-static intptr_t gettid(void) { return (intptr_t)pthread_self(); }
++static intptr_t sys_gettid(void) { return (intptr_t)pthread_self(); }
+
+ void gpr_log(const char* file, int line, gpr_log_severity severity,
+              const char* format, ...) {
+@@ -86,7 +86,7 @@ void gpr_default_log(gpr_log_func_args* args) {
+   char* prefix;
+   gpr_asprintf(&prefix, "%s%s.%09d %7" PRIdPTR " %s:%d]",
+                gpr_log_severity_string(args->severity), time_buffer,
+-               (int)(now.tv_nsec), gettid(), display_file, args->line);
++               (int)(now.tv_nsec), sys_gettid(), display_file, args->line);
+
+   fprintf(stderr, "%-70s %s\n", prefix, args->message);
+   gpr_free(prefix);
+diff --git a/third_party/grpc/src/core/lib/iomgr/ev_epollex_linux.cc b/src/core/lib/iomgr/ev_epollex_linux.cc
+index c2d80c08ddb..4a83cb6c215 100644
+--- a/third_party/grpc/src/core/lib/iomgr/ev_epollex_linux.cc
++++ b/third_party/grpc/src/core/lib/iomgr/ev_epollex_linux.cc
+@@ -1077,7 +1077,7 @@ static void end_worker(grpc_pollset* pollset, grpc_pollset_worker* worker,
+ }
+
+ #ifndef NDEBUG
+-static long gettid(void) { return syscall(__NR_gettid); }
++static long sys_gettid(void) { return syscall(__NR_gettid); }
+ #endif
+
+ /* pollset->mu lock must be held by the caller before calling this.
+@@ -1097,7 +1097,7 @@ static grpc_error* pollset_work(grpc_pollset* pollset,
+ #define WORKER_PTR (&worker)
+ #endif
+ #ifndef NDEBUG
+-  WORKER_PTR->originator = gettid();
++  WORKER_PTR->originator = sys_gettid();
+ #endif
+   if (GRPC_TRACE_FLAG_ENABLED(grpc_polling_trace)) {
+     gpr_log(GPR_INFO,
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_1/src-deps.json b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_1/src-deps.json
new file mode 100644
index 000000000000..7cf939daa72b
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_1/src-deps.json
@@ -0,0 +1,506 @@
+{
+    "0.16.2.zip": {
+        "name": "0.16.2.zip",
+        "sha256": "9b72bb0aea72d7cbcfc82a01b1e25bf3d85f791e790ddec16c65e2d906382ee0",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_nodejs/archive/0.16.2.zip",
+            "https://github.com/bazelbuild/rules_nodejs/archive/0.16.2.zip"
+        ]
+    },
+    "0.28.3.tar.gz": {
+        "name": "0.28.3.tar.gz",
+        "sha256": "d8c2f20deb2f6143bac792d210db1a4872102d81529fe0ea3476c1696addd7ff",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/bazel-toolchains/archive/0.28.3.tar.gz",
+            "https://github.com/bazelbuild/bazel-toolchains/archive/0.28.3.tar.gz"
+        ]
+    },
+    "0d5f3f2768c6ca2faca0079a997a97ce22997a0c.zip": {
+        "name": "0d5f3f2768c6ca2faca0079a997a97ce22997a0c.zip",
+        "sha256": "36fa66d4d49debd71d05fba55c1353b522e8caef4a20f8080a3d17cdda001d89",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_cc/archive/0d5f3f2768c6ca2faca0079a997a97ce22997a0c.zip",
+            "https://github.com/bazelbuild/rules_cc/archive/0d5f3f2768c6ca2faca0079a997a97ce22997a0c.zip"
+        ]
+    },
+    "441afe1bfdadd6236988e9cac159df6b5a9f5a98.zip": {
+        "name": "441afe1bfdadd6236988e9cac159df6b5a9f5a98.zip",
+        "sha256": "a07fe5e75964361885db725039c2ba673f0ee0313d971ae4f50c9b18cd28b0b5",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/platforms/archive/441afe1bfdadd6236988e9cac159df6b5a9f5a98.zip",
+            "https://github.com/bazelbuild/platforms/archive/441afe1bfdadd6236988e9cac159df6b5a9f5a98.zip"
+        ]
+    },
+    "7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip": {
+        "name": "7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip",
+        "sha256": "bc81f1ba47ef5cc68ad32225c3d0e70b8c6f6077663835438da8d5733f917598",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_java/archive/7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip",
+            "https://github.com/bazelbuild/rules_java/archive/7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip"
+        ]
+    },
+    "8ccf4f1c351928b55d5dddf3672e3667f6978d60.tar.gz": {
+        "name": "8ccf4f1c351928b55d5dddf3672e3667f6978d60.tar.gz",
+        "sha256": "d868ce50d592ef4aad7dec4dd32ae68d2151261913450fac8390b3fd474bb898",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_sass/archive/8ccf4f1c351928b55d5dddf3672e3667f6978d60.tar.gz",
+            "https://github.com/bazelbuild/rules_sass/archive/8ccf4f1c351928b55d5dddf3672e3667f6978d60.tar.gz"
+        ]
+    },
+    "97d8af4dc474595af3900dd85cb3a29ad28cc313.tar.gz": {
+        "name": "97d8af4dc474595af3900dd85cb3a29ad28cc313.tar.gz",
+        "sha256": "602e7161d9195e50246177e7c55b2f39950a9cf7366f74ed5f22fd45750cd208",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_proto/archive/97d8af4dc474595af3900dd85cb3a29ad28cc313.tar.gz",
+            "https://github.com/bazelbuild/rules_proto/archive/97d8af4dc474595af3900dd85cb3a29ad28cc313.tar.gz"
+        ]
+    },
+    "android_tools_pkg-0.12.tar.gz": {
+        "name": "android_tools_pkg-0.12.tar.gz",
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+    "rules_java": {
+        "name": "rules_java",
+        "sha256": "bc81f1ba47ef5cc68ad32225c3d0e70b8c6f6077663835438da8d5733f917598",
+        "strip_prefix": "rules_java-7cf3cefd652008d0a64a419c34c13bdca6c8f178",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_java/archive/7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip",
+            "https://github.com/bazelbuild/rules_java/archive/7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip"
+        ]
+    },
+    "rules_pkg": {
+        "name": "rules_pkg",
+        "sha256": "5bdc04987af79bd27bc5b00fe30f59a858f77ffa0bd2d8143d5b31ad8b1bd71c",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_pkg/rules_pkg-0.2.0.tar.gz",
+            "https://github.com/bazelbuild/rules_pkg/releases/download/0.2.0/rules_pkg-0.2.0.tar.gz"
+        ]
+    },
+    "rules_pkg-0.2.0.tar.gz": {
+        "name": "rules_pkg-0.2.0.tar.gz",
+        "sha256": "5bdc04987af79bd27bc5b00fe30f59a858f77ffa0bd2d8143d5b31ad8b1bd71c",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_pkg/rules_pkg-0.2.0.tar.gz",
+            "https://github.com/bazelbuild/rules_pkg/releases/download/0.2.0/rules_pkg-0.2.0.tar.gz"
+        ]
+    },
+    "rules_proto": {
+        "name": "rules_proto",
+        "sha256": "602e7161d9195e50246177e7c55b2f39950a9cf7366f74ed5f22fd45750cd208",
+        "strip_prefix": "rules_proto-97d8af4dc474595af3900dd85cb3a29ad28cc313",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_proto/archive/97d8af4dc474595af3900dd85cb3a29ad28cc313.tar.gz",
+            "https://github.com/bazelbuild/rules_proto/archive/97d8af4dc474595af3900dd85cb3a29ad28cc313.tar.gz"
+        ]
+    },
+    "zulu10.2+3-jdk10.0.1-linux_x64-allmodules.tar.gz": {
+        "name": "zulu10.2+3-jdk10.0.1-linux_x64-allmodules.tar.gz",
+        "sha256": "57fad3602e74c79587901d6966d3b54ef32cb811829a2552163185d5064fe9b5",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu10.2+3-jdk10.0.1/zulu10.2+3-jdk10.0.1-linux_x64-allmodules.tar.gz"
+        ]
+    },
+    "zulu10.2+3-jdk10.0.1-macosx_x64-allmodules.tar.gz": {
+        "name": "zulu10.2+3-jdk10.0.1-macosx_x64-allmodules.tar.gz",
+        "sha256": "e669c9a897413d855b550b4e39d79614392e6fb96f494e8ef99a34297d9d85d3",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu10.2+3-jdk10.0.1/zulu10.2+3-jdk10.0.1-macosx_x64-allmodules.tar.gz"
+        ]
+    },
+    "zulu10.2+3-jdk10.0.1-win_x64-allmodules.zip": {
+        "name": "zulu10.2+3-jdk10.0.1-win_x64-allmodules.zip",
+        "sha256": "c39e7700a8d41794d60985df5a20352435196e78ecbc6a2b30df7be8637bffd5",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu10.2+3-jdk10.0.1/zulu10.2+3-jdk10.0.1-win_x64-allmodules.zip"
+        ]
+    },
+    "zulu11.2.3-jdk11.0.1-linux_x64.tar.gz": {
+        "name": "zulu11.2.3-jdk11.0.1-linux_x64.tar.gz",
+        "sha256": "232b1c3511f0d26e92582b7c3cc363be7ac633e371854ca2f2e9f2b50eb72a75",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.2.3-jdk11.0.1/zulu11.2.3-jdk11.0.1-linux_x64.tar.gz"
+        ]
+    },
+    "zulu11.2.3-jdk11.0.1-macosx_x64.tar.gz": {
+        "name": "zulu11.2.3-jdk11.0.1-macosx_x64.tar.gz",
+        "sha256": "1edf366ee821e5db8e348152fcb337b28dfd6bf0f97943c270dcc6747cedb6cb",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.2.3-jdk11.0.1/zulu11.2.3-jdk11.0.1-macosx_x64.tar.gz"
+        ]
+    },
+    "zulu11.2.3-jdk11.0.1-win_x64.zip": {
+        "name": "zulu11.2.3-jdk11.0.1-win_x64.zip",
+        "sha256": "8e1e2b8347de6746f3fd1538840dd643201533ab113abc4ed93678e342d28aa3",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.2.3-jdk11.0.1/zulu11.2.3-jdk11.0.1-win_x64.zip"
+        ]
+    },
+    "zulu11.29.3-ca-jdk11.0.2-linux_x64.tar.gz": {
+        "name": "zulu11.29.3-ca-jdk11.0.2-linux_x64.tar.gz",
+        "sha256": "f3f44b6235508e87b760bf37a49e186cc1fa4e9cd28384c4dbf5a33991921e08",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.29.3-ca-jdk11.0.2/zulu11.29.3-ca-jdk11.0.2-linux_x64.tar.gz"
+        ]
+    },
+    "zulu11.29.3-ca-jdk11.0.2-macosx_x64.zip": {
+        "name": "zulu11.29.3-ca-jdk11.0.2-macosx_x64.zip",
+        "sha256": "059f8e3484bf07b63a8f2820d5f528f473eff1befdb1896ee4f8ff06be3b8d8f",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.29.3-ca-jdk11.0.2/zulu11.29.3-ca-jdk11.0.2-macosx_x64.zip"
+        ]
+    },
+    "zulu11.29.3-ca-jdk11.0.2-win_x64.zip": {
+        "name": "zulu11.29.3-ca-jdk11.0.2-win_x64.zip",
+        "sha256": "e1f5b4ce1b9148140fae2fcfb8a96d1c9b7eac5b8df0e13fbcad9b8561284880",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.29.3-ca-jdk11.0.2/zulu11.29.3-ca-jdk11.0.2-win_x64.zip"
+        ]
+    },
+    "zulu11.31.15-ca-jdk11.0.3-linux_aarch64.tar.gz": {
+        "name": "zulu11.31.15-ca-jdk11.0.3-linux_aarch64.tar.gz",
+        "sha256": "3b0d91611b1bdc4d409afcf9eab4f0e7f4ae09f88fc01bd9f2b48954882ae69b",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.31.15-ca-jdk11.0.3/zulu11.31.15-ca-jdk11.0.3-linux_aarch64.tar.gz"
+        ]
+    },
+    "zulu9.0.7.1-jdk9.0.7-linux_x64-allmodules.tar.gz": {
+        "name": "zulu9.0.7.1-jdk9.0.7-linux_x64-allmodules.tar.gz",
+        "sha256": "f27cb933de4f9e7fe9a703486cf44c84bc8e9f138be0c270c9e5716a32367e87",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu-9.0.7.1-jdk9.0.7/zulu9.0.7.1-jdk9.0.7-linux_x64-allmodules.tar.gz"
+        ]
+    },
+    "zulu9.0.7.1-jdk9.0.7-macosx_x64-allmodules.tar.gz": {
+        "name": "zulu9.0.7.1-jdk9.0.7-macosx_x64-allmodules.tar.gz",
+        "sha256": "404e7058ff91f956612f47705efbee8e175a38b505fb1b52d8c1ea98718683de",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu-9.0.7.1-jdk9.0.7/zulu9.0.7.1-jdk9.0.7-macosx_x64-allmodules.tar.gz"
+        ]
+    },
+    "zulu9.0.7.1-jdk9.0.7-win_x64-allmodules.zip": {
+        "name": "zulu9.0.7.1-jdk9.0.7-win_x64-allmodules.zip",
+        "sha256": "e738829017f107e7a7cd5069db979398ec3c3f03ef56122f89ba38e7374f63ed",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu-9.0.7.1-jdk9.0.7/zulu9.0.7.1-jdk9.0.7-win_x64-allmodules.zip"
+        ]
+    }
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_3/default.nix b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_3/default.nix
new file mode 100644
index 000000000000..5b20ece76803
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_3/default.nix
@@ -0,0 +1,622 @@
+{ stdenv, callPackage, lib, fetchurl, fetchFromGitHub, installShellFiles
+, runCommand, runCommandCC, makeWrapper, recurseIntoAttrs
+# this package (through the fixpoint glass)
+, bazel_self
+, lr, xe, zip, unzip, bash, writeCBin, coreutils
+, which, gawk, gnused, gnutar, gnugrep, gzip, findutils
+# updater
+, python27, python3, writeScript
+# Apple dependencies
+, cctools, libcxx, CoreFoundation, CoreServices, Foundation
+# Allow to independently override the jdks used to build and run respectively
+, buildJdk, runJdk
+, buildJdkName
+, runtimeShell
+# Downstream packages for tests
+, bazel-watcher
+# Always assume all markers valid (this is needed because we remove markers; they are non-deterministic).
+# Also, don't clean up environment variables (so that NIX_ environment variables are passed to compilers).
+, enableNixHacks ? false
+, gcc-unwrapped
+, autoPatchelfHook
+, file
+, substituteAll
+, writeTextFile
+}:
+
+let
+  version = "3.7.2";
+
+  src = fetchurl {
+    url = "https://github.com/bazelbuild/bazel/releases/download/${version}/bazel-${version}-dist.zip";
+    sha256 = "1cfrbs23lg0jnl22ddylx3clcjw7bdpbix7r5lqibab346s5n9fy";
+  };
+
+  # Update with `eval $(nix-build -A bazel.updater)`,
+  # then add new dependencies from the dict in ./src-deps.json as required.
+  srcDeps = lib.attrsets.attrValues srcDepsSet;
+  srcDepsSet =
+    let
+      srcs = (builtins.fromJSON (builtins.readFile ./src-deps.json));
+      toFetchurl = d: lib.attrsets.nameValuePair d.name (fetchurl {
+        urls = d.urls;
+        sha256 = d.sha256;
+        });
+        in builtins.listToAttrs (map toFetchurl [
+      srcs.desugar_jdk_libs
+      srcs.io_bazel_skydoc
+      srcs.bazel_skylib
+      srcs.io_bazel_rules_sass
+      srcs.platforms
+      # `bazel query` wants all of these to be available regardless of platform.
+      srcs."java_tools_javac11_darwin-v10.0.zip"
+      srcs."java_tools_javac11_linux-v10.0.zip"
+      srcs."java_tools_javac11_windows-v10.0.zip"
+      srcs."coverage_output_generator-v2.5.zip"
+      srcs.build_bazel_rules_nodejs
+      srcs."android_tools_pkg-0.19.0rc3.tar.gz"
+      srcs."bazel-toolchains-3.1.0.tar.gz"
+      srcs."com_github_grpc_grpc"
+      srcs.upb
+      srcs.rules_pkg
+      srcs.rules_cc
+      srcs.rules_java
+      srcs.rules_proto
+      srcs.com_google_protobuf
+      ]);
+
+  distDir = runCommand "bazel-deps" {} ''
+    mkdir -p $out
+    for i in ${builtins.toString srcDeps}; do cp $i $out/$(stripHash $i); done
+  '';
+
+  defaultShellPath = lib.makeBinPath
+    # Keep this list conservative. For more exotic tools, prefer to use
+    # @rules_nixpkgs to pull in tools from the nix repository. Example:
+    #
+    # WORKSPACE:
+    #
+    #     nixpkgs_git_repository(
+    #         name = "nixpkgs",
+    #         revision = "def5124ec8367efdba95a99523dd06d918cb0ae8",
+    #     )
+    #
+    #     # This defines an external Bazel workspace.
+    #     nixpkgs_package(
+    #         name = "bison",
+    #         repositories = { "nixpkgs": "@nixpkgs//:default.nix" },
+    #     )
+    #
+    # some/BUILD.bazel:
+    #
+    #     genrule(
+    #        ...
+    #        cmd = "$(location @bison//:bin/bison) -other -args",
+    #        tools = [
+    #            ...
+    #            "@bison//:bin/bison",
+    #        ],
+    #     )
+    #
+    [ bash coreutils findutils gawk gnugrep gnutar gnused gzip which unzip file zip ];
+
+  # Java toolchain used for the build and tests
+  javaToolchain = "@bazel_tools//tools/jdk:toolchain_${buildJdkName}";
+
+  platforms = lib.platforms.linux ++ lib.platforms.darwin;
+
+  # This repository is fetched by bazel at runtime
+  # however it contains prebuilt java binaries, with wrong interpreter
+  # and libraries path.
+  # We prefetch it, patch it, and override it in a global bazelrc.
+  system = if stdenv.hostPlatform.isDarwin then "darwin" else "linux";
+  arch = stdenv.hostPlatform.parsed.cpu.name;
+
+  remote_java_tools = stdenv.mkDerivation {
+    name = "remote_java_tools_${system}";
+
+    src = srcDepsSet."java_tools_javac11_${system}-v10.0.zip";
+
+    nativeBuildInputs = [ autoPatchelfHook unzip ];
+    buildInputs = [ gcc-unwrapped ];
+
+    sourceRoot = ".";
+
+    buildPhase = ''
+      mkdir $out;
+    '';
+
+    installPhase = ''
+      cp -Ra * $out/
+      touch $out/WORKSPACE
+    '';
+  };
+
+  bazelRC = writeTextFile {
+    name = "bazel-rc";
+    text = ''
+      startup --server_javabase=${runJdk}
+
+      # Can't use 'common'; https://github.com/bazelbuild/bazel/issues/3054
+      # Most commands inherit from 'build' anyway.
+      build --distdir=${distDir}
+      fetch --distdir=${distDir}
+      query --distdir=${distDir}
+
+      build --override_repository=${remote_java_tools.name}=${remote_java_tools}
+      fetch --override_repository=${remote_java_tools.name}=${remote_java_tools}
+      query --override_repository=${remote_java_tools.name}=${remote_java_tools}
+
+      # Provide a default java toolchain, this will be the same as ${runJdk}
+      build --host_javabase='@local_jdk//:jdk'
+
+      # load default location for the system wide configuration
+      try-import /etc/bazel.bazelrc
+    '';
+  };
+
+in
+stdenv.mkDerivation rec {
+  pname = "bazel";
+  inherit version;
+
+  meta = with lib; {
+    homepage = "https://github.com/bazelbuild/bazel/";
+    description = "Build tool that builds code quickly and reliably";
+    license = licenses.asl20;
+    maintainers = [ maintainers.mboes ];
+    inherit platforms;
+  };
+
+  inherit src;
+  sourceRoot = ".";
+
+  patches = [
+    # On Darwin, the last argument to gcc is coming up as an empty string. i.e: ''
+    # This is breaking the build of any C target. This patch removes the last
+    # argument if it's found to be an empty string.
+    ../trim-last-argument-to-gcc-if-empty.patch
+
+    # On Darwin, using clang 6 to build fails because of a linker error (see #105573),
+    # but using clang 7 fails because libarclite_macosx.a cannot be found when linking
+    # the xcode_locator tool.
+    # This patch removes using the -fobjc-arc compiler option and makes the code
+    # compile without automatic reference counting. Caveat: this leaks memory, but
+    # we accept this fact because xcode_locator is only a short-lived process used during the build.
+    ./no-arc.patch
+
+    # --experimental_strict_action_env (which may one day become the default
+    # see bazelbuild/bazel#2574) hardcodes the default
+    # action environment to a non hermetic value (e.g. "/usr/local/bin").
+    # This is non hermetic on non-nixos systems. On NixOS, bazel cannot find the required binaries.
+    # So we are replacing this bazel paths by defaultShellPath,
+    # improving hermeticity and making it work in nixos.
+    (substituteAll {
+      src = ../strict_action_env.patch;
+      strictActionEnvPatch = defaultShellPath;
+    })
+
+    # bazel reads its system bazelrc in /etc
+    # override this path to a builtin one
+    (substituteAll {
+      src = ../bazel_rc.patch;
+      bazelSystemBazelRCPath = bazelRC;
+    })
+  ] ++ lib.optional enableNixHacks ../nix-hacks.patch;
+
+
+  # Additional tests that check bazel’s functionality. Execute
+  #
+  #     nix-build . -A bazel.tests
+  #
+  # in the nixpkgs checkout root to exercise them locally.
+  passthru.tests =
+    let
+      runLocal = name: attrs: script:
+      let
+        attrs' = removeAttrs attrs [ "buildInputs" ];
+        buildInputs = [ python3 ] ++ (attrs.buildInputs or []);
+      in
+      runCommandCC name ({
+        inherit buildInputs;
+        preferLocalBuild = true;
+        meta.platforms = platforms;
+      } // attrs') script;
+
+      # bazel wants to extract itself into $install_dir/install every time it runs,
+      # so let’s do that only once.
+      extracted = bazelPkg:
+        let install_dir =
+          # `install_base` field printed by `bazel info`, minus the hash.
+          # yes, this path is kinda magic. Sorry.
+          "$HOME/.cache/bazel/_bazel_nixbld";
+        in runLocal "bazel-extracted-homedir" { passthru.install_dir = install_dir; } ''
+            export HOME=$(mktemp -d)
+            touch WORKSPACE # yeah, everything sucks
+            install_base="$(${bazelPkg}/bin/bazel info | grep install_base)"
+            # assert it’s actually below install_dir
+            [[ "$install_base" =~ ${install_dir} ]] \
+              || (echo "oh no! $install_base but we are \
+            trying to copy ${install_dir} to $out instead!"; exit 1)
+            cp -R ${install_dir} $out
+          '';
+
+      bazelTest = { name, bazelScript, workspaceDir, bazelPkg, buildInputs ? [] }:
+        let
+          be = extracted bazelPkg;
+        in runLocal name { inherit buildInputs; } (
+          # skip extraction caching on Darwin, because nobody knows how Darwin works
+          (lib.optionalString (!stdenv.hostPlatform.isDarwin) ''
+            # set up home with pre-unpacked bazel
+            export HOME=$(mktemp -d)
+            mkdir -p ${be.install_dir}
+            cp -R ${be}/install ${be.install_dir}
+
+            # https://stackoverflow.com/questions/47775668/bazel-how-to-skip-corrupt-installation-on-centos6
+            # Bazel checks whether the mtime of the install dir files
+            # is >9 years in the future, otherwise it extracts itself again.
+            # see PosixFileMTime::IsUntampered in src/main/cpp/util
+            # What the hell bazel.
+            ${lr}/bin/lr -0 -U ${be.install_dir} | ${xe}/bin/xe -N0 -0 touch --date="9 years 6 months" {}
+          '')
+          +
+          ''
+            # Note https://github.com/bazelbuild/bazel/issues/5763#issuecomment-456374609
+            # about why to create a subdir for the workspace.
+            cp -r ${workspaceDir} wd && chmod u+w wd && cd wd
+
+            ${bazelScript}
+
+            touch $out
+          '');
+
+      bazelWithNixHacks = bazel_self.override { enableNixHacks = true; };
+
+      bazel-examples = fetchFromGitHub {
+        owner = "bazelbuild";
+        repo = "examples";
+        rev = "5d8c8961a2516ebf875787df35e98cadd08d43dc";
+        sha256 = "03c1bwlq5bs3hg96v4g4pg2vqwhqq6w538h66rcpw02f83yy7fs8";
+      };
+
+    in (if !stdenv.hostPlatform.isDarwin then {
+      # `extracted` doesn’t work on darwin
+      shebang = callPackage ../shebang-test.nix { inherit runLocal extracted bazelTest distDir; };
+    } else {}) // {
+      bashTools = callPackage ../bash-tools-test.nix { inherit runLocal bazelTest distDir; };
+      cpp = callPackage ../cpp-test.nix { inherit runLocal bazelTest bazel-examples distDir; };
+      java = callPackage ../java-test.nix { inherit runLocal bazelTest bazel-examples distDir; };
+      protobuf = callPackage ../protobuf-test.nix { inherit runLocal bazelTest distDir; };
+      pythonBinPath = callPackage ../python-bin-path-test.nix { inherit runLocal bazelTest distDir; };
+
+      bashToolsWithNixHacks = callPackage ../bash-tools-test.nix { inherit runLocal bazelTest distDir; bazel = bazelWithNixHacks; };
+
+      cppWithNixHacks = callPackage ../cpp-test.nix { inherit runLocal bazelTest bazel-examples distDir; bazel = bazelWithNixHacks; };
+      javaWithNixHacks = callPackage ../java-test.nix { inherit runLocal bazelTest bazel-examples distDir; bazel = bazelWithNixHacks; };
+      protobufWithNixHacks = callPackage ../protobuf-test.nix { inherit runLocal bazelTest distDir; bazel = bazelWithNixHacks; };
+      pythonBinPathWithNixHacks = callPackage ../python-bin-path-test.nix { inherit runLocal bazelTest distDir; bazel = bazelWithNixHacks; };
+
+      # downstream packages using buildBazelPackage
+      # fixed-output hashes of the fetch phase need to be spot-checked manually
+      downstream = recurseIntoAttrs ({
+        inherit bazel-watcher;
+      }
+          # dm-sonnet is only packaged for linux
+      // (lib.optionalAttrs stdenv.isLinux {
+          # TODO(timokau) dm-sonnet is broken currently
+          # dm-sonnet-linux = python3.pkgs.dm-sonnet;
+      }));
+    };
+
+  # update the list of workspace dependencies
+  passthru.updater = writeScript "update-bazel-deps.sh" ''
+    #!${runtimeShell}
+    cat ${runCommand "bazel-deps.json" {} ''
+        ${unzip}/bin/unzip ${src} WORKSPACE
+        ${python3}/bin/python3 ${../update-srcDeps.py} ./WORKSPACE > $out
+    ''} > ${builtins.toString ./src-deps.json}
+  '';
+
+  # Necessary for the tests to pass on Darwin with sandbox enabled.
+  # Bazel starts a local server and needs to bind a local address.
+  __darwinAllowLocalNetworking = true;
+
+  # Bazel expects several utils to be available in Bash even without PATH. Hence this hack.
+  customBash = writeCBin "bash" ''
+    #include <stdio.h>
+    #include <stdlib.h>
+    #include <string.h>
+    #include <unistd.h>
+
+    extern char **environ;
+
+    int main(int argc, char *argv[]) {
+      char *path = getenv("PATH");
+      char *pathToAppend = "${defaultShellPath}";
+      char *newPath;
+      if (path != NULL) {
+        int length = strlen(path) + 1 + strlen(pathToAppend) + 1;
+        newPath = malloc(length * sizeof(char));
+        snprintf(newPath, length, "%s:%s", path, pathToAppend);
+      } else {
+        newPath = pathToAppend;
+      }
+      setenv("PATH", newPath, 1);
+      execve("${bash}/bin/bash", argv, environ);
+      return 0;
+    }
+  '';
+
+  postPatch = let
+
+    darwinPatches = ''
+      bazelLinkFlags () {
+        eval set -- "$NIX_LDFLAGS"
+        local flag
+        for flag in "$@"; do
+          printf ' -Wl,%s' "$flag"
+        done
+      }
+
+      # Disable Bazel's Xcode toolchain detection which would configure compilers
+      # and linkers from Xcode instead of from PATH
+      export BAZEL_USE_CPP_ONLY_TOOLCHAIN=1
+
+      # Explicitly configure gcov since we don't have it on Darwin, so autodetection fails
+      export GCOV=${coreutils}/bin/false
+
+      # Framework search paths aren't added by bintools hook
+      # https://github.com/NixOS/nixpkgs/pull/41914
+      export NIX_LDFLAGS+=" -F${CoreFoundation}/Library/Frameworks -F${CoreServices}/Library/Frameworks -F${Foundation}/Library/Frameworks"
+
+      # libcxx includes aren't added by libcxx hook
+      # https://github.com/NixOS/nixpkgs/pull/41589
+      export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -isystem ${libcxx}/include/c++/v1"
+
+      # don't use system installed Xcode to run clang, use Nix clang instead
+      sed -i -E "s;/usr/bin/xcrun (--sdk macosx )?clang;${stdenv.cc}/bin/clang $NIX_CFLAGS_COMPILE $(bazelLinkFlags) -framework CoreFoundation;g" \
+        scripts/bootstrap/compile.sh \
+        src/tools/xcode/realpath/BUILD \
+        src/tools/xcode/stdredirect/BUILD \
+        tools/osx/BUILD
+
+      substituteInPlace scripts/bootstrap/compile.sh --replace ' -mmacosx-version-min=10.9' ""
+
+      # nixpkgs's libSystem cannot use pthread headers directly, must import GCD headers instead
+      sed -i -e "/#include <pthread\/spawn.h>/i #include <dispatch/dispatch.h>" src/main/cpp/blaze_util_darwin.cc
+
+      # clang installed from Xcode has a compatibility wrapper that forwards
+      # invocations of gcc to clang, but vanilla clang doesn't
+      sed -i -e 's;_find_generic(repository_ctx, "gcc", "CC", overriden_tools);_find_generic(repository_ctx, "clang", "CC", overriden_tools);g' tools/cpp/unix_cc_configure.bzl
+
+      sed -i -e 's;/usr/bin/libtool;${cctools}/bin/libtool;g' tools/cpp/unix_cc_configure.bzl
+      wrappers=( tools/cpp/osx_cc_wrapper.sh tools/cpp/osx_cc_wrapper.sh.tpl )
+      for wrapper in "''${wrappers[@]}"; do
+        sed -i -e "s,/usr/bin/install_name_tool,${cctools}/bin/install_name_tool,g" $wrapper
+      done
+    '';
+
+    genericPatches = ''
+      # Substitute j2objc and objc wrapper's python shebang to plain python path.
+      # These scripts explicitly depend on Python 2.7, hence we use python27.
+      # See also `postFixup` where python27 is added to $out/nix-support
+      substituteInPlace tools/j2objc/j2objc_header_map.py --replace "$!/usr/bin/python2.7" "#!${python27}/bin/python"
+      substituteInPlace tools/j2objc/j2objc_wrapper.py --replace "$!/usr/bin/python2.7" "#!${python27}/bin/python"
+      substituteInPlace tools/objc/j2objc_dead_code_pruner.py --replace "$!/usr/bin/python2.7" "#!${python27}/bin/python"
+
+      # md5sum is part of coreutils
+      sed -i 's|/sbin/md5|md5sum|' \
+        src/BUILD
+
+      # replace initial value of pythonShebang variable in BazelPythonSemantics.java
+      substituteInPlace src/main/java/com/google/devtools/build/lib/bazel/rules/python/BazelPythonSemantics.java \
+        --replace '"#!/usr/bin/env " + pythonExecutableName' "\"#!${python3}/bin/python\""
+
+      # substituteInPlace is rather slow, so prefilter the files with grep
+      grep -rlZ /bin src/main/java/com/google/devtools | while IFS="" read -r -d "" path; do
+        # If you add more replacements here, you must change the grep above!
+        # Only files containing /bin are taken into account.
+        # We default to python3 where possible. See also `postFixup` where
+        # python3 is added to $out/nix-support
+        substituteInPlace "$path" \
+          --replace /bin/bash ${customBash}/bin/bash \
+          --replace "/usr/bin/env bash" ${customBash}/bin/bash \
+          --replace "/usr/bin/env python" ${python3}/bin/python \
+          --replace /usr/bin/env ${coreutils}/bin/env \
+          --replace /bin/true ${coreutils}/bin/true
+      done
+
+      # bazel test runner include references to /bin/bash
+      substituteInPlace tools/build_rules/test_rules.bzl \
+        --replace /bin/bash ${customBash}/bin/bash
+
+      for i in $(find tools/cpp/ -type f)
+      do
+        substituteInPlace $i \
+          --replace /bin/bash ${customBash}/bin/bash
+      done
+
+      # Fixup scripts that generate scripts. Not fixed up by patchShebangs below.
+      substituteInPlace scripts/bootstrap/compile.sh \
+          --replace /bin/bash ${customBash}/bin/bash
+
+      # add nix environment vars to .bazelrc
+      cat >> .bazelrc <<EOF
+      # Limit the resources Bazel is allowed to use during the build to 1/2 the
+      # available RAM and 3/4 the available CPU cores. This should help avoid
+      # overwhelming the build machine.
+      build --local_ram_resources=HOST_RAM*.5
+      build --local_cpu_resources=HOST_CPUS*.75
+
+      build --distdir=${distDir}
+      fetch --distdir=${distDir}
+      build --copt="$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --copt="/g')"
+      build --host_copt="$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --host_copt="/g')"
+      build --linkopt="$(echo $(< ${stdenv.cc}/nix-support/libcxx-ldflags) | sed -e 's/ /" --linkopt="/g')"
+      build --host_linkopt="$(echo $(< ${stdenv.cc}/nix-support/libcxx-ldflags) | sed -e 's/ /" --host_linkopt="/g')"
+      build --linkopt="-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --linkopt="-Wl,/g')"
+      build --host_linkopt="-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --host_linkopt="-Wl,/g')"
+      build --host_javabase='@local_jdk//:jdk'
+      build --host_java_toolchain='${javaToolchain}'
+      EOF
+
+      # add the same environment vars to compile.sh
+      sed -e "/\$command \\\\$/a --copt=\"$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --copt=\"/g')\" \\\\" \
+          -e "/\$command \\\\$/a --host_copt=\"$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --host_copt=\"/g')\" \\\\" \
+          -e "/\$command \\\\$/a --linkopt=\"$(echo $(< ${stdenv.cc}/nix-support/libcxx-ldflags) | sed -e 's/ /" --linkopt=\"/g')\" \\\\" \
+          -e "/\$command \\\\$/a --host_linkopt=\"$(echo $(< ${stdenv.cc}/nix-support/libcxx-ldflags) | sed -e 's/ /" --host_linkopt=\"/g')\" \\\\" \
+          -e "/\$command \\\\$/a --linkopt=\"-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --linkopt=\"-Wl,/g')\" \\\\" \
+          -e "/\$command \\\\$/a --host_linkopt=\"-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --host_linkopt=\"-Wl,/g')\" \\\\" \
+          -e "/\$command \\\\$/a --host_javabase='@local_jdk//:jdk' \\\\" \
+          -e "/\$command \\\\$/a --host_java_toolchain='${javaToolchain}' \\\\" \
+          -i scripts/bootstrap/compile.sh
+
+      # This is necessary to avoid:
+      # "error: no visible @interface for 'NSDictionary' declares the selector
+      # 'initWithContentsOfURL:error:'"
+      # This can be removed when the apple_sdk is upgraded beyond 10.13+
+      sed -i '/initWithContentsOfURL:versionPlistUrl/ {
+        N
+        s/error:nil\];/\];/
+      }' tools/osx/xcode_locator.m
+
+      # append the PATH with defaultShellPath in tools/bash/runfiles/runfiles.bash
+      echo "PATH=\$PATH:${defaultShellPath}" >> runfiles.bash.tmp
+      cat tools/bash/runfiles/runfiles.bash >> runfiles.bash.tmp
+      mv runfiles.bash.tmp tools/bash/runfiles/runfiles.bash
+
+      patchShebangs .
+    '';
+    in lib.optionalString stdenv.hostPlatform.isDarwin darwinPatches
+     + genericPatches;
+
+  buildInputs = [
+    buildJdk
+    python3
+  ];
+
+  # when a command can’t be found in a bazel build, you might also
+  # need to add it to `defaultShellPath`.
+  nativeBuildInputs = [
+    installShellFiles
+    zip
+    python3
+    unzip
+    makeWrapper
+    which
+    customBash
+  ] ++ lib.optionals (stdenv.isDarwin) [ cctools libcxx CoreFoundation CoreServices Foundation ];
+
+  # Bazel makes extensive use of symlinks in the WORKSPACE.
+  # This causes problems with infinite symlinks if the build output is in the same location as the
+  # Bazel WORKSPACE. This is why before executing the build, the source code is moved into a
+  # subdirectory.
+  # Failing to do this causes "infinite symlink expansion detected"
+  preBuildPhases = ["preBuildPhase"];
+  preBuildPhase = ''
+    mkdir bazel_src
+    shopt -s dotglob extglob
+    mv !(bazel_src) bazel_src
+  '';
+
+  buildPhase = ''
+    # Increasing memory during compilation might be necessary.
+    # export BAZEL_JAVAC_OPTS="-J-Xmx2g -J-Xms200m"
+    ./bazel_src/compile.sh
+    ./bazel_src/scripts/generate_bash_completion.sh \
+        --bazel=./bazel_src/output/bazel \
+        --output=./bazel_src/output/bazel-complete.bash \
+        --prepend=./bazel_src/scripts/bazel-complete-header.bash \
+        --prepend=./bazel_src/scripts/bazel-complete-template.bash
+
+    # need to change directory for bazel to find the workspace
+    cd ./bazel_src
+    # build execlog tooling
+    export HOME=$(mktemp -d)
+    ./output/bazel build  src/tools/execlog:parser_deploy.jar
+    cd -
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+
+    # official wrapper scripts that searches for $WORKSPACE_ROOT/tools/bazel
+    # if it can’t find something in tools, it calls $out/bin/bazel-{version}-{os_arch}
+    # The binary _must_ exist with this naming if your project contains a .bazelversion
+    # file.
+    cp ./bazel_src/scripts/packages/bazel.sh $out/bin/bazel
+
+    mkdir $out/share
+    cp ./bazel_src/bazel-bin/src/tools/execlog/parser_deploy.jar $out/share/parser_deploy.jar
+    mv ./bazel_src/output/bazel $out/bin/bazel-${version}-${system}-${arch}
+    cat <<EOF > $out/bin/bazel-execlog
+    #!${runtimeShell} -e
+    ${runJdk}/bin/java -jar $out/share/parser_deploy.jar \$@
+    EOF
+    chmod +x $out/bin/bazel-execlog
+
+    # shell completion files
+    installShellCompletion --bash \
+      --name bazel.bash \
+      ./bazel_src/output/bazel-complete.bash
+    installShellCompletion --zsh \
+      --name _bazel \
+      ./bazel_src/scripts/zsh_completion/_bazel
+    installShellCompletion --fish \
+      --name bazel.fish \
+      ./bazel_src/scripts/fish/completions/bazel.fish
+  '';
+
+  doInstallCheck = true;
+  installCheckPhase = ''
+    export TEST_TMPDIR=$(pwd)
+
+    hello_test () {
+      $out/bin/bazel test \
+        --test_output=errors \
+        --java_toolchain='${javaToolchain}' \
+        examples/cpp:hello-success_test \
+        examples/java-native/src/test/java/com/example/myproject:hello
+    }
+
+    cd ./bazel_src
+
+    # test whether $WORKSPACE_ROOT/tools/bazel works
+
+    mkdir -p tools
+    cat > tools/bazel <<"EOF"
+    #!${runtimeShell} -e
+    exit 1
+    EOF
+    chmod +x tools/bazel
+
+    # first call should fail if tools/bazel is used
+    ! hello_test
+
+    cat > tools/bazel <<"EOF"
+    #!${runtimeShell} -e
+    exec "$BAZEL_REAL" "$@"
+    EOF
+
+    # second call succeeds because it defers to $out/bin/bazel-{version}-{os_arch}
+    hello_test
+  '';
+
+  # Save paths to hardcoded dependencies so Nix can detect them.
+  postFixup = ''
+    mkdir -p $out/nix-support
+    echo "${customBash} ${defaultShellPath}" >> $out/nix-support/depends
+    # The templates get tar’d up into a .jar,
+    # so nix can’t detect python is needed in the runtime closure
+    # Some of the scripts explicitly depend on Python 2.7. Otherwise, we
+    # default to using python3. Therefore, both python27 and python3 are
+    # runtime dependencies.
+    echo "${python27}" >> $out/nix-support/depends
+    echo "${python3}" >> $out/nix-support/depends
+  '' + lib.optionalString stdenv.isDarwin ''
+    echo "${cctools}" >> $out/nix-support/depends
+  '';
+
+  dontStrip = true;
+  dontPatchELF = true;
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_3/no-arc.patch b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_3/no-arc.patch
new file mode 100644
index 000000000000..012e613c2f19
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_3/no-arc.patch
@@ -0,0 +1,34 @@
+--- a/tools/osx/xcode_locator.m	2020-12-10 13:27:29.000000000 +0100
++++ b/tools/osx/xcode_locator.m	2021-02-01 09:09:32.159557051 +0100
+@@ -21,10 +21,6 @@
+ // 6,6.4,6.4.1 = 6.4.1
+ // 6.3,6.3.0 = 6.3
+ 
+-#if !defined(__has_feature) || !__has_feature(objc_arc)
+-#error "This file requires ARC support."
+-#endif
+-
+ #import <CoreServices/CoreServices.h>
+ #import <Foundation/Foundation.h>
+ 
+--- a/tools/osx/xcode_configure.bzl	1980-01-01 01:00:00.000000000 +0100
++++ b/tools/osx/xcode_configure.bzl	2021-02-01 09:36:57.773418444 +0100
+@@ -123,7 +123,6 @@
+         "macosx",
+         "clang",
+         "-mmacosx-version-min=10.9",
+-        "-fobjc-arc",
+         "-framework",
+         "CoreServices",
+         "-framework",
+--- a/tools/osx/BUILD	2021-02-01 11:01:02.191659553 +0100
++++ b/tools/osx/BUILD	2021-02-01 11:04:29.735071019 +0100
+@@ -27,7 +27,7 @@
+ ])
+ 
+ DARWIN_XCODE_LOCATOR_COMPILE_COMMAND = """
+-  /usr/bin/xcrun --sdk macosx clang -mmacosx-version-min=10.9 -fobjc-arc -framework CoreServices \
++  /usr/bin/xcrun --sdk macosx clang -mmacosx-version-min=10.9 -framework CoreServices \
+       -framework Foundation -o $@ $<
+ """
+ 
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_3/src-deps.json b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_3/src-deps.json
new file mode 100644
index 000000000000..96553d9d8859
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_3/src-deps.json
@@ -0,0 +1,861 @@
+{
+    "1.25.0.zip": {
+        "name": "1.25.0.zip",
+        "sha256": "c78be58f5e0a29a04686b628cf54faaee0094322ae0ac99da5a8a8afca59a647",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_sass/archive/1.25.0.zip",
+            "https://github.com/bazelbuild/rules_sass/archive/1.25.0.zip"
+        ]
+    },
+    "1ef781ced3b1443dca3ed05dec1989eca1a4e1cd.tar.gz": {
+        "name": "1ef781ced3b1443dca3ed05dec1989eca1a4e1cd.tar.gz",
+        "sha256": "5a725b777976b77aa122b707d1b6f0f39b6020f66cd427bb111a585599c857b1",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/stardoc/archive/1ef781ced3b1443dca3ed05dec1989eca1a4e1cd.tar.gz",
+            "https://github.com/bazelbuild/stardoc/archive/1ef781ced3b1443dca3ed05dec1989eca1a4e1cd.tar.gz"
+        ]
+    },
+    "2d4c9528e0f453b5950eeaeac11d8d09f5a504d4.tar.gz": {
+        "name": "2d4c9528e0f453b5950eeaeac11d8d09f5a504d4.tar.gz",
+        "sha256": "c00ceec469dbcf7929972e3c79f20c14033824538038a554952f5c31d8832f96",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/archive/2d4c9528e0f453b5950eeaeac11d8d09f5a504d4.tar.gz",
+            "https://github.com/bazelbuild/bazel-skylib/archive/2d4c9528e0f453b5950eeaeac11d8d09f5a504d4.tar.gz"
+        ]
+    },
+    "46993efdd33b73649796c5fc5c9efb193ae19d51.zip": {
+        "name": "46993efdd33b73649796c5fc5c9efb193ae19d51.zip",
+        "sha256": "66184688debeeefcc2a16a2f80b03f514deac8346fe888fb7e691a52c023dd88",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/platforms/archive/46993efdd33b73649796c5fc5c9efb193ae19d51.zip",
+            "https://github.com/bazelbuild/platforms/archive/46993efdd33b73649796c5fc5c9efb193ae19d51.zip"
+        ]
+    },
+    "7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip": {
+        "name": "7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip",
+        "sha256": "bc81f1ba47ef5cc68ad32225c3d0e70b8c6f6077663835438da8d5733f917598",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_java/archive/7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip",
+            "https://github.com/bazelbuild/rules_java/archive/7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip"
+        ]
+    },
+    "97d8af4dc474595af3900dd85cb3a29ad28cc313.tar.gz": {
+        "name": "97d8af4dc474595af3900dd85cb3a29ad28cc313.tar.gz",
+        "sha256": "602e7161d9195e50246177e7c55b2f39950a9cf7366f74ed5f22fd45750cd208",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_proto/archive/97d8af4dc474595af3900dd85cb3a29ad28cc313.tar.gz",
+            "https://github.com/bazelbuild/rules_proto/archive/97d8af4dc474595af3900dd85cb3a29ad28cc313.tar.gz"
+        ]
+    },
+    "9effcbcb27f0a665f9f345030188c0b291e32482.tar.gz": {
+        "name": "9effcbcb27f0a665f9f345030188c0b291e32482.tar.gz",
+        "sha256": "61d0417abd60e65ed589c9deee7c124fe76a4106831f6ad39464e1525cef1454",
+        "urls": [
+            "https://mirror.bazel.build/github.com/protocolbuffers/upb/archive/9effcbcb27f0a665f9f345030188c0b291e32482.tar.gz",
+            "https://github.com/protocolbuffers/upb/archive/9effcbcb27f0a665f9f345030188c0b291e32482.tar.gz"
+        ]
+    },
+    "android_tools_for_testing": {
+        "name": "android_tools_for_testing",
+        "patch_cmds": [
+            "test -f BUILD && chmod u+w BUILD || true",
+            "echo >> BUILD",
+            "echo 'exports_files([\"WORKSPACE\"], visibility = [\"//visibility:public\"])' >> BUILD"
+        ],
+        "patch_cmds_win": [
+            "Add-Content -Path BUILD -Value \"`nexports_files([`\"WORKSPACE`\"], visibility = [`\"//visibility:public`\"])`n\" -Force"
+        ],
+        "sha256": "ea5c0589a01e2a9f43c20e5c145d3530e3b3bdbe7322789bc5da38d0ca49b837",
+        "url": "https://mirror.bazel.build/bazel_android_tools/android_tools_pkg-0.19.0rc3.tar.gz"
+    },
+    "android_tools_pkg-0.19.0rc3.tar.gz": {
+        "name": "android_tools_pkg-0.19.0rc3.tar.gz",
+        "sha256": "ea5c0589a01e2a9f43c20e5c145d3530e3b3bdbe7322789bc5da38d0ca49b837",
+        "urls": [
+            "https://mirror.bazel.build/bazel_android_tools/android_tools_pkg-0.19.0rc3.tar.gz"
+        ]
+    },
+    "b1c40e1de81913a3c40e5948f78719c28152486d.zip": {
+        "name": "b1c40e1de81913a3c40e5948f78719c28152486d.zip",
+        "sha256": "d0c573b94a6ef20ef6ff20154a23d0efcb409fb0e1ff0979cec318dfe42f0cdd",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_cc/archive/b1c40e1de81913a3c40e5948f78719c28152486d.zip",
+            "https://github.com/bazelbuild/rules_cc/archive/b1c40e1de81913a3c40e5948f78719c28152486d.zip"
+        ]
+    },
+    "bazel-toolchains-3.1.0.tar.gz": {
+        "name": "bazel-toolchains-3.1.0.tar.gz",
+        "sha256": "726b5423e1c7a3866a3a6d68e7123b4a955e9fcbe912a51e0f737e6dab1d0af2",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/bazel-toolchains/releases/download/3.1.0/bazel-toolchains-3.1.0.tar.gz",
+            "https://github.com/bazelbuild/bazel-toolchains/releases/download/3.1.0/bazel-toolchains-3.1.0.tar.gz"
+        ]
+    },
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+    },
+    "rules_pkg-0.2.4.tar.gz": {
+        "name": "rules_pkg-0.2.4.tar.gz",
+        "sha256": "4ba8f4ab0ff85f2484287ab06c0d871dcb31cc54d439457d28fd4ae14b18450a",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_pkg/releases/download/0.2.4/rules_pkg-0.2.4.tar.gz",
+            "https://github.com/bazelbuild/rules_pkg/releases/download/0.2.4/rules_pkg-0.2.4.tar.gz"
+        ]
+    },
+    "rules_proto": {
+        "name": "rules_proto",
+        "patch_cmds": [
+            "test -f BUILD.bazel && chmod u+w BUILD.bazel || true",
+            "echo >> BUILD.bazel",
+            "echo 'exports_files([\"WORKSPACE\"], visibility = [\"//visibility:public\"])' >> BUILD.bazel"
+        ],
+        "patch_cmds_win": [
+            "Add-Content -Path BUILD.bazel -Value \"`nexports_files([`\"WORKSPACE`\"], visibility = [`\"//visibility:public`\"])`n\" -Force"
+        ],
+        "sha256": "602e7161d9195e50246177e7c55b2f39950a9cf7366f74ed5f22fd45750cd208",
+        "strip_prefix": "rules_proto-97d8af4dc474595af3900dd85cb3a29ad28cc313",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_proto/archive/97d8af4dc474595af3900dd85cb3a29ad28cc313.tar.gz",
+            "https://github.com/bazelbuild/rules_proto/archive/97d8af4dc474595af3900dd85cb3a29ad28cc313.tar.gz"
+        ]
+    },
+    "upb": {
+        "name": "upb",
+        "patch_args": [
+            "-p1"
+        ],
+        "patches": [
+            "//third_party/grpc:upb_gcc10_fix.patch"
+        ],
+        "sha256": "61d0417abd60e65ed589c9deee7c124fe76a4106831f6ad39464e1525cef1454",
+        "strip_prefix": "upb-9effcbcb27f0a665f9f345030188c0b291e32482",
+        "urls": [
+            "https://mirror.bazel.build/github.com/protocolbuffers/upb/archive/9effcbcb27f0a665f9f345030188c0b291e32482.tar.gz",
+            "https://github.com/protocolbuffers/upb/archive/9effcbcb27f0a665f9f345030188c0b291e32482.tar.gz"
+        ]
+    },
+    "v1.26.0.tar.gz": {
+        "name": "v1.26.0.tar.gz",
+        "sha256": "2fcb7f1ab160d6fd3aaade64520be3e5446fc4c6fa7ba6581afdc4e26094bd81",
+        "urls": [
+            "https://mirror.bazel.build/github.com/grpc/grpc/archive/v1.26.0.tar.gz",
+            "https://github.com/grpc/grpc/archive/v1.26.0.tar.gz"
+        ]
+    },
+    "v3.13.0.tar.gz": {
+        "name": "v3.13.0.tar.gz",
+        "sha256": "9b4ee22c250fe31b16f1a24d61467e40780a3fbb9b91c3b65be2a376ed913a1a",
+        "urls": [
+            "https://mirror.bazel.build/github.com/protocolbuffers/protobuf/archive/v3.13.0.tar.gz",
+            "https://github.com/protocolbuffers/protobuf/archive/v3.13.0.tar.gz"
+        ]
+    },
+    "zulu11.37.17-ca-jdk11.0.6-linux_x64.tar.gz": {
+        "name": "zulu11.37.17-ca-jdk11.0.6-linux_x64.tar.gz",
+        "sha256": "360626cc19063bc411bfed2914301b908a8f77a7919aaea007a977fa8fb3cde1",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.37.17-ca-jdk11.0.6/zulu11.37.17-ca-jdk11.0.6-linux_x64.tar.gz"
+        ]
+    },
+    "zulu11.37.17-ca-jdk11.0.6-macosx_x64.tar.gz": {
+        "name": "zulu11.37.17-ca-jdk11.0.6-macosx_x64.tar.gz",
+        "sha256": "e1fe56769f32e2aaac95e0a8f86b5a323da5af3a3b4bba73f3086391a6cc056f",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.37.17-ca-jdk11.0.6/zulu11.37.17-ca-jdk11.0.6-macosx_x64.tar.gz"
+        ]
+    },
+    "zulu11.37.17-ca-jdk11.0.6-win_x64.zip": {
+        "name": "zulu11.37.17-ca-jdk11.0.6-win_x64.zip",
+        "sha256": "a9695617b8374bfa171f166951214965b1d1d08f43218db9a2a780b71c665c18",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.37.17-ca-jdk11.0.6/zulu11.37.17-ca-jdk11.0.6-win_x64.zip"
+        ]
+    },
+    "zulu11.37.48-ca-jdk11.0.6-linux_aarch64.tar.gz": {
+        "name": "zulu11.37.48-ca-jdk11.0.6-linux_aarch64.tar.gz",
+        "sha256": "a452f1b9682d9f83c1c14e54d1446e1c51b5173a3a05dcb013d380f9508562e4",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.37.48-ca-jdk11.0.6/zulu11.37.48-ca-jdk11.0.6-linux_aarch64.tar.gz"
+        ]
+    }
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_4/default.nix b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_4/default.nix
new file mode 100644
index 000000000000..31dbc2779cde
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_4/default.nix
@@ -0,0 +1,654 @@
+{ stdenv, callPackage, lib, fetchurl, fetchFromGitHub, installShellFiles
+, runCommand, runCommandCC, makeWrapper, recurseIntoAttrs
+# this package (through the fixpoint glass)
+, bazel_self
+# needed only for the updater
+, bazel_3
+, lr, xe, zip, unzip, bash, writeCBin, coreutils
+, which, gawk, gnused, gnutar, gnugrep, gzip, findutils
+# updater
+, python27, python3, writeScript
+# Apple dependencies
+, cctools, libcxx, CoreFoundation, CoreServices, Foundation
+# Allow to independently override the jdks used to build and run respectively
+, buildJdk, runJdk
+, buildJdkName
+, runtimeShell
+# Downstream packages for tests
+, bazel-watcher
+# Always assume all markers valid (this is needed because we remove markers; they are non-deterministic).
+# Also, don't clean up environment variables (so that NIX_ environment variables are passed to compilers).
+, enableNixHacks ? false
+, gcc-unwrapped
+, autoPatchelfHook
+, file
+, substituteAll
+, writeTextFile
+}:
+
+let
+  version = "4.0.0";
+  sourceRoot = ".";
+
+  src = fetchurl {
+    url = "https://github.com/bazelbuild/bazel/releases/download/${version}/bazel-${version}-dist.zip";
+    sha256 = "1lfdx54dpzwrqysg5ngqhq7a0i01xk981crd4pdk4jb5f07ghl6k";
+  };
+
+  # Update with `eval $(nix-build -A bazel.updater)`,
+  # then add new dependencies from the dict in ./src-deps.json as required.
+  srcDeps = lib.attrsets.attrValues srcDepsSet;
+  srcDepsSet =
+    let
+      srcs = (builtins.fromJSON (builtins.readFile ./src-deps.json));
+      toFetchurl = d: lib.attrsets.nameValuePair d.name (fetchurl {
+        urls = d.urls;
+        sha256 = d.sha256;
+        });
+        in builtins.listToAttrs (map toFetchurl [
+      srcs.desugar_jdk_libs
+      srcs.io_bazel_skydoc
+      srcs.bazel_skylib
+      srcs.io_bazel_rules_sass
+      srcs.platforms
+      (if stdenv.hostPlatform.isDarwin
+       then srcs."java_tools_javac11_darwin-v10.5.zip"
+       else srcs."java_tools_javac11_linux-v10.5.zip")
+      srcs."coverage_output_generator-v2.5.zip"
+      srcs.build_bazel_rules_nodejs
+      srcs."android_tools_pkg-0.19.0rc3.tar.gz"
+      srcs.bazel_toolchains
+      srcs.com_github_grpc_grpc
+      srcs.upb
+      srcs.com_google_protobuf
+      srcs.rules_pkg
+      srcs.rules_cc
+      srcs.rules_java
+      srcs.rules_proto
+      srcs.com_google_absl
+      srcs.com_github_google_re2
+      srcs.com_github_cares_cares
+      ]);
+
+  distDir = runCommand "bazel-deps" {} ''
+    mkdir -p $out
+    for i in ${builtins.toString srcDeps}; do cp $i $out/$(stripHash $i); done
+  '';
+
+  defaultShellPath = lib.makeBinPath
+    # Keep this list conservative. For more exotic tools, prefer to use
+    # @rules_nixpkgs to pull in tools from the nix repository. Example:
+    #
+    # WORKSPACE:
+    #
+    #     nixpkgs_git_repository(
+    #         name = "nixpkgs",
+    #         revision = "def5124ec8367efdba95a99523dd06d918cb0ae8",
+    #     )
+    #
+    #     # This defines an external Bazel workspace.
+    #     nixpkgs_package(
+    #         name = "bison",
+    #         repositories = { "nixpkgs": "@nixpkgs//:default.nix" },
+    #     )
+    #
+    # some/BUILD.bazel:
+    #
+    #     genrule(
+    #        ...
+    #        cmd = "$(location @bison//:bin/bison) -other -args",
+    #        tools = [
+    #            ...
+    #            "@bison//:bin/bison",
+    #        ],
+    #     )
+    #
+    [ bash coreutils findutils gawk gnugrep gnutar gnused gzip which unzip file zip python27 python3 ];
+
+  # Java toolchain used for the build and tests
+  javaToolchain = "@bazel_tools//tools/jdk:toolchain_${buildJdkName}";
+
+  platforms = lib.platforms.linux ++ lib.platforms.darwin;
+
+  # This repository is fetched by bazel at runtime
+  # however it contains prebuilt java binaries, with wrong interpreter
+  # and libraries path.
+  # We prefetch it, patch it, and override it in a global bazelrc.
+  system = if stdenv.hostPlatform.isDarwin then "darwin" else "linux";
+  arch = stdenv.hostPlatform.parsed.cpu.name;
+
+  remote_java_tools = stdenv.mkDerivation {
+    name = "remote_java_tools_${system}";
+
+    src = srcDepsSet."java_tools_javac11_${system}-v10.5.zip";
+
+    nativeBuildInputs = [ autoPatchelfHook unzip ];
+    buildInputs = [ gcc-unwrapped ];
+
+    sourceRoot = ".";
+
+    buildPhase = ''
+      mkdir $out;
+    '';
+
+    installPhase = ''
+      cp -Ra * $out/
+      touch $out/WORKSPACE
+    '';
+  };
+
+  bazelRC = writeTextFile {
+    name = "bazel-rc";
+    text = ''
+      startup --server_javabase=${runJdk}
+
+      # Can't use 'common'; https://github.com/bazelbuild/bazel/issues/3054
+      # Most commands inherit from 'build' anyway.
+      build --distdir=${distDir}
+      fetch --distdir=${distDir}
+      query --distdir=${distDir}
+
+      build --override_repository=${remote_java_tools.name}=${remote_java_tools}
+      fetch --override_repository=${remote_java_tools.name}=${remote_java_tools}
+      query --override_repository=${remote_java_tools.name}=${remote_java_tools}
+
+      # Provide a default java toolchain, this will be the same as ${runJdk}
+      build --host_javabase='@local_jdk//:jdk'
+
+      # load default location for the system wide configuration
+      try-import /etc/bazel.bazelrc
+    '';
+  };
+
+in
+stdenv.mkDerivation rec {
+  pname = "bazel";
+  inherit version;
+
+  meta = with lib; {
+    homepage = "https://github.com/bazelbuild/bazel/";
+    description = "Build tool that builds code quickly and reliably";
+    license = licenses.asl20;
+    maintainers = [ maintainers.mboes ];
+    inherit platforms;
+  };
+
+  inherit src;
+  inherit sourceRoot;
+  patches = [
+    # On Darwin, the last argument to gcc is coming up as an empty string. i.e: ''
+    # This is breaking the build of any C target. This patch removes the last
+    # argument if it's found to be an empty string.
+    ../trim-last-argument-to-gcc-if-empty.patch
+
+    # On Darwin, using clang 6 to build fails because of a linker error (see #105573),
+    # but using clang 7 fails because libarclite_macosx.a cannot be found when linking
+    # the xcode_locator tool.
+    # This patch removes using the -fobjc-arc compiler option and makes the code
+    # compile without automatic reference counting. Caveat: this leaks memory, but
+    # we accept this fact because xcode_locator is only a short-lived process used during the build.
+    ./no-arc.patch
+
+    # --experimental_strict_action_env (which may one day become the default
+    # see bazelbuild/bazel#2574) hardcodes the default
+    # action environment to a non hermetic value (e.g. "/usr/local/bin").
+    # This is non hermetic on non-nixos systems. On NixOS, bazel cannot find the required binaries.
+    # So we are replacing this bazel paths by defaultShellPath,
+    # improving hermeticity and making it work in nixos.
+    (substituteAll {
+      src = ../strict_action_env.patch;
+      strictActionEnvPatch = defaultShellPath;
+    })
+
+    # bazel reads its system bazelrc in /etc
+    # override this path to a builtin one
+    (substituteAll {
+      src = ../bazel_rc.patch;
+      bazelSystemBazelRCPath = bazelRC;
+    })
+  ] ++ lib.optional enableNixHacks ../nix-hacks.patch;
+
+
+  # Additional tests that check bazel’s functionality. Execute
+  #
+  #     nix-build . -A bazel.tests
+  #
+  # in the nixpkgs checkout root to exercise them locally.
+  passthru.tests =
+    let
+      runLocal = name: attrs: script:
+      let
+        attrs' = removeAttrs attrs [ "buildInputs" ];
+        buildInputs = [ python3 ] ++ (attrs.buildInputs or []);
+      in
+      runCommandCC name ({
+        inherit buildInputs;
+        preferLocalBuild = true;
+        meta.platforms = platforms;
+      } // attrs') script;
+
+      # bazel wants to extract itself into $install_dir/install every time it runs,
+      # so let’s do that only once.
+      extracted = bazelPkg:
+        let install_dir =
+          # `install_base` field printed by `bazel info`, minus the hash.
+          # yes, this path is kinda magic. Sorry.
+          "$HOME/.cache/bazel/_bazel_nixbld";
+        in runLocal "bazel-extracted-homedir" { passthru.install_dir = install_dir; } ''
+            export HOME=$(mktemp -d)
+            touch WORKSPACE # yeah, everything sucks
+            install_base="$(${bazelPkg}/bin/bazel info | grep install_base)"
+            # assert it’s actually below install_dir
+            [[ "$install_base" =~ ${install_dir} ]] \
+              || (echo "oh no! $install_base but we are \
+            trying to copy ${install_dir} to $out instead!"; exit 1)
+            cp -R ${install_dir} $out
+          '';
+
+      bazelTest = { name, bazelScript, workspaceDir, bazelPkg, buildInputs ? [] }:
+        let
+          be = extracted bazelPkg;
+        in runLocal name { inherit buildInputs; } (
+          # skip extraction caching on Darwin, because nobody knows how Darwin works
+          (lib.optionalString (!stdenv.hostPlatform.isDarwin) ''
+            # set up home with pre-unpacked bazel
+            export HOME=$(mktemp -d)
+            mkdir -p ${be.install_dir}
+            cp -R ${be}/install ${be.install_dir}
+
+            # https://stackoverflow.com/questions/47775668/bazel-how-to-skip-corrupt-installation-on-centos6
+            # Bazel checks whether the mtime of the install dir files
+            # is >9 years in the future, otherwise it extracts itself again.
+            # see PosixFileMTime::IsUntampered in src/main/cpp/util
+            # What the hell bazel.
+            ${lr}/bin/lr -0 -U ${be.install_dir} | ${xe}/bin/xe -N0 -0 touch --date="9 years 6 months" {}
+          '')
+          +
+          ''
+            # Note https://github.com/bazelbuild/bazel/issues/5763#issuecomment-456374609
+            # about why to create a subdir for the workspace.
+            cp -r ${workspaceDir} wd && chmod u+w wd && cd wd
+
+            ${bazelScript}
+
+            touch $out
+          '');
+
+      bazelWithNixHacks = bazel_self.override { enableNixHacks = true; };
+
+      bazel-examples = fetchFromGitHub {
+        owner = "bazelbuild";
+        repo = "examples";
+        rev = "4183fc709c26a00366665e2d60d70521dc0b405d";
+        sha256 = "1mm4awx6sa0myiz9j4hwp71rpr7yh8vihf3zm15n2ii6xb82r31k";
+      };
+
+    in (if !stdenv.hostPlatform.isDarwin then {
+      # `extracted` doesn’t work on darwin
+      shebang = callPackage ../shebang-test.nix { inherit runLocal extracted bazelTest distDir; };
+    } else {}) // {
+      bashTools = callPackage ../bash-tools-test.nix { inherit runLocal bazelTest distDir; };
+      cpp = callPackage ../cpp-test.nix { inherit runLocal bazelTest bazel-examples distDir; };
+      java = callPackage ../java-test.nix { inherit runLocal bazelTest bazel-examples distDir; };
+      protobuf = callPackage ../protobuf-test.nix { inherit runLocal bazelTest distDir; };
+      pythonBinPath = callPackage ../python-bin-path-test.nix { inherit runLocal bazelTest distDir; };
+
+      bashToolsWithNixHacks = callPackage ../bash-tools-test.nix { inherit runLocal bazelTest distDir; bazel = bazelWithNixHacks; };
+
+      cppWithNixHacks = callPackage ../cpp-test.nix { inherit runLocal bazelTest bazel-examples distDir; bazel = bazelWithNixHacks; };
+      javaWithNixHacks = callPackage ../java-test.nix { inherit runLocal bazelTest bazel-examples distDir; bazel = bazelWithNixHacks; };
+      protobufWithNixHacks = callPackage ../protobuf-test.nix { inherit runLocal bazelTest distDir; bazel = bazelWithNixHacks; };
+      pythonBinPathWithNixHacks = callPackage ../python-bin-path-test.nix { inherit runLocal bazelTest distDir; bazel = bazelWithNixHacks; };
+
+      # downstream packages using buildBazelPackage
+      # fixed-output hashes of the fetch phase need to be spot-checked manually
+      downstream = recurseIntoAttrs ({
+        inherit bazel-watcher;
+      }
+          # dm-sonnet is only packaged for linux
+      // (lib.optionalAttrs stdenv.isLinux {
+          # TODO(timokau) dm-sonnet is broken currently
+          # dm-sonnet-linux = python3.pkgs.dm-sonnet;
+      }));
+    };
+
+  src_for_updater = stdenv.mkDerivation rec {
+    name = "updater-sources";
+    inherit src;
+    nativeBuildInputs = [ unzip ];
+    inherit sourceRoot;
+    installPhase = ''
+      cp -r . "$out"
+    '';
+  };
+  # update the list of workspace dependencies
+  passthru.updater = writeScript "update-bazel-deps.sh" ''
+    #!${runtimeShell}
+    (cd "${src_for_updater}" &&
+        BAZEL_USE_CPP_ONLY_TOOLCHAIN=1 \
+        "${bazel_3}"/bin/bazel \
+            query 'kind(http_archive, //external:all) + kind(http_file, //external:all) + kind(distdir_tar, //external:all) + kind(git_repository, //external:all)' \
+            --loading_phase_threads=1 \
+            --output build) \
+    | "${python3}"/bin/python3 "${./update-srcDeps.py}" \
+      "${builtins.toString ./src-deps.json}"
+  '';
+
+  # Necessary for the tests to pass on Darwin with sandbox enabled.
+  # Bazel starts a local server and needs to bind a local address.
+  __darwinAllowLocalNetworking = true;
+
+  # Bazel expects several utils to be available in Bash even without PATH. Hence this hack.
+  customBash = writeCBin "bash" ''
+    #include <stdio.h>
+    #include <stdlib.h>
+    #include <string.h>
+    #include <unistd.h>
+
+    extern char **environ;
+
+    int main(int argc, char *argv[]) {
+      char *path = getenv("PATH");
+      char *pathToAppend = "${defaultShellPath}";
+      char *newPath;
+      if (path != NULL) {
+        int length = strlen(path) + 1 + strlen(pathToAppend) + 1;
+        newPath = malloc(length * sizeof(char));
+        snprintf(newPath, length, "%s:%s", path, pathToAppend);
+      } else {
+        newPath = pathToAppend;
+      }
+      setenv("PATH", newPath, 1);
+      execve("${bash}/bin/bash", argv, environ);
+      return 0;
+    }
+  '';
+
+  postPatch = let
+
+    darwinPatches = ''
+      bazelLinkFlags () {
+        eval set -- "$NIX_LDFLAGS"
+        local flag
+        for flag in "$@"; do
+          printf ' -Wl,%s' "$flag"
+        done
+      }
+
+      # Disable Bazel's Xcode toolchain detection which would configure compilers
+      # and linkers from Xcode instead of from PATH
+      export BAZEL_USE_CPP_ONLY_TOOLCHAIN=1
+
+      # Explicitly configure gcov since we don't have it on Darwin, so autodetection fails
+      export GCOV=${coreutils}/bin/false
+
+      # Framework search paths aren't added by bintools hook
+      # https://github.com/NixOS/nixpkgs/pull/41914
+      export NIX_LDFLAGS+=" -F${CoreFoundation}/Library/Frameworks -F${CoreServices}/Library/Frameworks -F${Foundation}/Library/Frameworks"
+
+      # libcxx includes aren't added by libcxx hook
+      # https://github.com/NixOS/nixpkgs/pull/41589
+      export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -isystem ${libcxx}/include/c++/v1"
+
+      # don't use system installed Xcode to run clang, use Nix clang instead
+      sed -i -E "s;/usr/bin/xcrun (--sdk macosx )?clang;${stdenv.cc}/bin/clang $NIX_CFLAGS_COMPILE $(bazelLinkFlags) -framework CoreFoundation;g" \
+        scripts/bootstrap/compile.sh \
+        src/tools/xcode/realpath/BUILD \
+        src/tools/xcode/stdredirect/BUILD \
+        tools/osx/BUILD
+
+      substituteInPlace scripts/bootstrap/compile.sh --replace ' -mmacosx-version-min=10.9' ""
+
+      # nixpkgs's libSystem cannot use pthread headers directly, must import GCD headers instead
+      sed -i -e "/#include <pthread\/spawn.h>/i #include <dispatch/dispatch.h>" src/main/cpp/blaze_util_darwin.cc
+
+      # clang installed from Xcode has a compatibility wrapper that forwards
+      # invocations of gcc to clang, but vanilla clang doesn't
+      sed -i -e 's;_find_generic(repository_ctx, "gcc", "CC", overriden_tools);_find_generic(repository_ctx, "clang", "CC", overriden_tools);g' tools/cpp/unix_cc_configure.bzl
+
+      sed -i -e 's;/usr/bin/libtool;${cctools}/bin/libtool;g' tools/cpp/unix_cc_configure.bzl
+      wrappers=( tools/cpp/osx_cc_wrapper.sh tools/cpp/osx_cc_wrapper.sh.tpl )
+      for wrapper in "''${wrappers[@]}"; do
+        sed -i -e "s,/usr/bin/install_name_tool,${cctools}/bin/install_name_tool,g" $wrapper
+      done
+    '';
+
+    genericPatches = ''
+      # Substitute j2objc and objc wrapper's python shebang to plain python path.
+      # These scripts explicitly depend on Python 2.7, hence we use python27.
+      # See also `postFixup` where python27 is added to $out/nix-support
+      substituteInPlace tools/j2objc/j2objc_header_map.py --replace "$!/usr/bin/python2.7" "#!${python27}/bin/python"
+      substituteInPlace tools/j2objc/j2objc_wrapper.py --replace "$!/usr/bin/python2.7" "#!${python27}/bin/python"
+      substituteInPlace tools/objc/j2objc_dead_code_pruner.py --replace "$!/usr/bin/python2.7" "#!${python27}/bin/python"
+
+      # md5sum is part of coreutils
+      sed -i 's|/sbin/md5|md5sum|' \
+        src/BUILD
+
+      # replace initial value of pythonShebang variable in BazelPythonSemantics.java
+      substituteInPlace src/main/java/com/google/devtools/build/lib/bazel/rules/python/BazelPythonSemantics.java \
+        --replace '"#!/usr/bin/env " + pythonExecutableName' "\"#!${python3}/bin/python\""
+
+      # substituteInPlace is rather slow, so prefilter the files with grep
+      grep -rlZ /bin src/main/java/com/google/devtools | while IFS="" read -r -d "" path; do
+        # If you add more replacements here, you must change the grep above!
+        # Only files containing /bin are taken into account.
+        # We default to python3 where possible. See also `postFixup` where
+        # python3 is added to $out/nix-support
+        substituteInPlace "$path" \
+          --replace /bin/bash ${customBash}/bin/bash \
+          --replace "/usr/bin/env bash" ${customBash}/bin/bash \
+          --replace "/usr/bin/env python" ${python3}/bin/python \
+          --replace /usr/bin/env ${coreutils}/bin/env \
+          --replace /bin/true ${coreutils}/bin/true
+      done
+
+      # bazel test runner include references to /bin/bash
+      substituteInPlace tools/build_rules/test_rules.bzl \
+        --replace /bin/bash ${customBash}/bin/bash
+
+      for i in $(find tools/cpp/ -type f)
+      do
+        substituteInPlace $i \
+          --replace /bin/bash ${customBash}/bin/bash
+      done
+
+      # Fixup scripts that generate scripts. Not fixed up by patchShebangs below.
+      substituteInPlace scripts/bootstrap/compile.sh \
+          --replace /bin/bash ${customBash}/bin/bash
+
+      # add nix environment vars to .bazelrc
+      cat >> .bazelrc <<EOF
+      # Limit the resources Bazel is allowed to use during the build to 1/2 the
+      # available RAM and 3/4 the available CPU cores. This should help avoid
+      # overwhelming the build machine.
+      build --local_ram_resources=HOST_RAM*.5
+      build --local_cpu_resources=HOST_CPUS*.75
+
+      build --distdir=${distDir}
+      fetch --distdir=${distDir}
+      build --copt="$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --copt="/g')"
+      build --host_copt="$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --host_copt="/g')"
+      build --linkopt="$(echo $(< ${stdenv.cc}/nix-support/libcxx-ldflags) | sed -e 's/ /" --linkopt="/g')"
+      build --host_linkopt="$(echo $(< ${stdenv.cc}/nix-support/libcxx-ldflags) | sed -e 's/ /" --host_linkopt="/g')"
+      build --linkopt="-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --linkopt="-Wl,/g')"
+      build --host_linkopt="-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --host_linkopt="-Wl,/g')"
+      build --host_javabase='@local_jdk//:jdk'
+      build --host_java_toolchain='${javaToolchain}'
+      build --verbose_failures
+      EOF
+
+      # add the same environment vars to compile.sh
+      sed -e "/\$command \\\\$/a --copt=\"$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --copt=\"/g')\" \\\\" \
+          -e "/\$command \\\\$/a --host_copt=\"$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --host_copt=\"/g')\" \\\\" \
+          -e "/\$command \\\\$/a --linkopt=\"$(echo $(< ${stdenv.cc}/nix-support/libcxx-ldflags) | sed -e 's/ /" --linkopt=\"/g')\" \\\\" \
+          -e "/\$command \\\\$/a --host_linkopt=\"$(echo $(< ${stdenv.cc}/nix-support/libcxx-ldflags) | sed -e 's/ /" --host_linkopt=\"/g')\" \\\\" \
+          -e "/\$command \\\\$/a --linkopt=\"-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --linkopt=\"-Wl,/g')\" \\\\" \
+          -e "/\$command \\\\$/a --host_linkopt=\"-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --host_linkopt=\"-Wl,/g')\" \\\\" \
+          -e "/\$command \\\\$/a --host_javabase='@local_jdk//:jdk' \\\\" \
+          -e "/\$command \\\\$/a --host_java_toolchain='${javaToolchain}' \\\\" \
+          -e "/\$command \\\\$/a --verbose_failures \\\\" \
+          -i scripts/bootstrap/compile.sh
+
+      # This is necessary to avoid:
+      # "error: no visible @interface for 'NSDictionary' declares the selector
+      # 'initWithContentsOfURL:error:'"
+      # This can be removed when the apple_sdk is upgraded beyond 10.13+
+      sed -i '/initWithContentsOfURL:versionPlistUrl/ {
+        N
+        s/error:nil\];/\];/
+      }' tools/osx/xcode_locator.m
+
+      # append the PATH with defaultShellPath in tools/bash/runfiles/runfiles.bash
+      echo "PATH=\$PATH:${defaultShellPath}" >> runfiles.bash.tmp
+      cat tools/bash/runfiles/runfiles.bash >> runfiles.bash.tmp
+      mv runfiles.bash.tmp tools/bash/runfiles/runfiles.bash
+
+      patchShebangs .
+    '';
+    in lib.optionalString stdenv.hostPlatform.isDarwin darwinPatches
+     + genericPatches;
+
+  buildInputs = [
+    buildJdk
+    python3
+  ];
+
+  # when a command can’t be found in a bazel build, you might also
+  # need to add it to `defaultShellPath`.
+  nativeBuildInputs = [
+    installShellFiles
+    zip
+    python3
+    unzip
+    makeWrapper
+    which
+    customBash
+  ] ++ lib.optionals (stdenv.isDarwin) [ cctools libcxx CoreFoundation CoreServices Foundation ];
+
+  # Bazel makes extensive use of symlinks in the WORKSPACE.
+  # This causes problems with infinite symlinks if the build output is in the same location as the
+  # Bazel WORKSPACE. This is why before executing the build, the source code is moved into a
+  # subdirectory.
+  # Failing to do this causes "infinite symlink expansion detected"
+  preBuildPhases = ["preBuildPhase"];
+  preBuildPhase = ''
+    mkdir bazel_src
+    shopt -s dotglob extglob
+    mv !(bazel_src) bazel_src
+  '';
+  # Needed to build fish completion
+  propagatedBuildInputs = [ python3.pkgs.absl-py ];
+  buildPhase = ''
+    # Increasing memory during compilation might be necessary.
+    # export BAZEL_JAVAC_OPTS="-J-Xmx2g -J-Xms200m"
+
+    # If EMBED_LABEL isn't set, it'd be auto-detected from CHANGELOG.md
+    # and `git rev-parse --short HEAD` which would result in
+    # "3.7.0- (@non-git)" due to non-git build and incomplete changelog.
+    # Actual bazel releases use scripts/release/common.sh which is based
+    # on branch/tag information which we don't have with tarball releases.
+    # Note that .bazelversion is always correct and is based on bazel-*
+    # executable name, version checks should work fine
+    export EMBED_LABEL="${version}- (@non-git)"
+    ${customBash}/bin/bash ./bazel_src/compile.sh
+    ./bazel_src/scripts/generate_bash_completion.sh \
+        --bazel=./bazel_src/output/bazel \
+        --output=./bazel_src/output/bazel-complete.bash \
+        --prepend=./bazel_src/scripts/bazel-complete-header.bash \
+        --prepend=./bazel_src/scripts/bazel-complete-template.bash
+    ${python3}/bin/python3 ./bazel_src/scripts/generate_fish_completion.py \
+        --bazel=./bazel_src/output/bazel \
+        --output=./bazel_src/output/bazel-complete.fish
+
+    # need to change directory for bazel to find the workspace
+    cd ./bazel_src
+    # build execlog tooling
+    export HOME=$(mktemp -d)
+    ./output/bazel build  src/tools/execlog:parser_deploy.jar
+    cd -
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+
+    # official wrapper scripts that searches for $WORKSPACE_ROOT/tools/bazel
+    # if it can’t find something in tools, it calls $out/bin/bazel-{version}-{os_arch}
+    # The binary _must_ exist with this naming if your project contains a .bazelversion
+    # file.
+    cp ./bazel_src/scripts/packages/bazel.sh $out/bin/bazel
+    mv ./bazel_src/output/bazel $out/bin/bazel-${version}-${system}-${arch}
+
+    mkdir $out/share
+    cp ./bazel_src/bazel-bin/src/tools/execlog/parser_deploy.jar $out/share/parser_deploy.jar
+    cat <<EOF > $out/bin/bazel-execlog
+    #!${runtimeShell} -e
+    ${runJdk}/bin/java -jar $out/share/parser_deploy.jar \$@
+    EOF
+    chmod +x $out/bin/bazel-execlog
+
+    # shell completion files
+    installShellCompletion --bash \
+      --name bazel.bash \
+      ./bazel_src/output/bazel-complete.bash
+    installShellCompletion --zsh \
+      --name _bazel \
+      ./bazel_src/scripts/zsh_completion/_bazel
+    installShellCompletion --fish \
+      --name bazel.fish \
+      ./bazel_src/output/bazel-complete.fish
+  '';
+
+  doInstallCheck = true;
+  installCheckPhase = ''
+    export TEST_TMPDIR=$(pwd)
+
+    hello_test () {
+      $out/bin/bazel test \
+        --test_output=errors \
+        --java_toolchain='${javaToolchain}' \
+        examples/cpp:hello-success_test \
+        examples/java-native/src/test/java/com/example/myproject:hello
+    }
+
+    cd ./bazel_src
+
+    # test whether $WORKSPACE_ROOT/tools/bazel works
+
+    mkdir -p tools
+    cat > tools/bazel <<"EOF"
+    #!${runtimeShell} -e
+    exit 1
+    EOF
+    chmod +x tools/bazel
+
+    # first call should fail if tools/bazel is used
+    ! hello_test
+
+    cat > tools/bazel <<"EOF"
+    #!${runtimeShell} -e
+    exec "$BAZEL_REAL" "$@"
+    EOF
+
+    # second call succeeds because it defers to $out/bin/bazel-{version}-{os_arch}
+    hello_test
+  '';
+
+  # Save paths to hardcoded dependencies so Nix can detect them.
+  postFixup = ''
+    mkdir -p $out/nix-support
+    echo "${customBash} ${defaultShellPath}" >> $out/nix-support/depends
+    # The templates get tar’d up into a .jar,
+    # so nix can’t detect python is needed in the runtime closure
+    # Some of the scripts explicitly depend on Python 2.7. Otherwise, we
+    # default to using python3. Therefore, both python27 and python3 are
+    # runtime dependencies.
+    echo "${python27}" >> $out/nix-support/depends
+    echo "${python3}" >> $out/nix-support/depends
+  '' + lib.optionalString stdenv.isDarwin ''
+    echo "${cctools}" >> $out/nix-support/depends
+  '';
+
+  dontStrip = true;
+  dontPatchELF = true;
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_4/no-arc.patch b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_4/no-arc.patch
new file mode 100644
index 000000000000..012e613c2f19
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_4/no-arc.patch
@@ -0,0 +1,34 @@
+--- a/tools/osx/xcode_locator.m	2020-12-10 13:27:29.000000000 +0100
++++ b/tools/osx/xcode_locator.m	2021-02-01 09:09:32.159557051 +0100
+@@ -21,10 +21,6 @@
+ // 6,6.4,6.4.1 = 6.4.1
+ // 6.3,6.3.0 = 6.3
+ 
+-#if !defined(__has_feature) || !__has_feature(objc_arc)
+-#error "This file requires ARC support."
+-#endif
+-
+ #import <CoreServices/CoreServices.h>
+ #import <Foundation/Foundation.h>
+ 
+--- a/tools/osx/xcode_configure.bzl	1980-01-01 01:00:00.000000000 +0100
++++ b/tools/osx/xcode_configure.bzl	2021-02-01 09:36:57.773418444 +0100
+@@ -123,7 +123,6 @@
+         "macosx",
+         "clang",
+         "-mmacosx-version-min=10.9",
+-        "-fobjc-arc",
+         "-framework",
+         "CoreServices",
+         "-framework",
+--- a/tools/osx/BUILD	2021-02-01 11:01:02.191659553 +0100
++++ b/tools/osx/BUILD	2021-02-01 11:04:29.735071019 +0100
+@@ -27,7 +27,7 @@
+ ])
+ 
+ DARWIN_XCODE_LOCATOR_COMPILE_COMMAND = """
+-  /usr/bin/xcrun --sdk macosx clang -mmacosx-version-min=10.9 -fobjc-arc -framework CoreServices \
++  /usr/bin/xcrun --sdk macosx clang -mmacosx-version-min=10.9 -framework CoreServices \
+       -framework Foundation -o $@ $<
+ """
+ 
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_4/src-deps.json b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_4/src-deps.json
new file mode 100644
index 000000000000..43ad41003152
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_4/src-deps.json
@@ -0,0 +1,1498 @@
+{
+    "1.25.0.zip": {
+        "name": "1.25.0.zip",
+        "sha256": "c78be58f5e0a29a04686b628cf54faaee0094322ae0ac99da5a8a8afca59a647",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_sass/archive/1.25.0.zip",
+            "https://github.com/bazelbuild/rules_sass/archive/1.25.0.zip"
+        ]
+    },
+    "1ef781ced3b1443dca3ed05dec1989eca1a4e1cd.tar.gz": {
+        "name": "1ef781ced3b1443dca3ed05dec1989eca1a4e1cd.tar.gz",
+        "sha256": "5a725b777976b77aa122b707d1b6f0f39b6020f66cd427bb111a585599c857b1",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/stardoc/archive/1ef781ced3b1443dca3ed05dec1989eca1a4e1cd.tar.gz",
+            "https://github.com/bazelbuild/stardoc/archive/1ef781ced3b1443dca3ed05dec1989eca1a4e1cd.tar.gz"
+        ]
+    },
+    "382d5afc60e05470c23e8de19b19fc5ad231e732.tar.gz": {
+        "name": "382d5afc60e05470c23e8de19b19fc5ad231e732.tar.gz",
+        "sha256": "7992217989f3156f8109931c1fc6db3434b7414957cb82371552377beaeb9d6c",
+        "urls": [
+            "https://mirror.bazel.build/github.com/protocolbuffers/upb/archive/382d5afc60e05470c23e8de19b19fc5ad231e732.tar.gz",
+            "https://github.com/protocolbuffers/upb/archive/382d5afc60e05470c23e8de19b19fc5ad231e732.tar.gz"
+        ]
+    },
+    "46993efdd33b73649796c5fc5c9efb193ae19d51.zip": {
+        "name": "46993efdd33b73649796c5fc5c9efb193ae19d51.zip",
+        "sha256": "66184688debeeefcc2a16a2f80b03f514deac8346fe888fb7e691a52c023dd88",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/platforms/archive/46993efdd33b73649796c5fc5c9efb193ae19d51.zip",
+            "https://github.com/bazelbuild/platforms/archive/46993efdd33b73649796c5fc5c9efb193ae19d51.zip"
+        ]
+    },
+    "7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip": {
+        "name": "7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip",
+        "sha256": "bc81f1ba47ef5cc68ad32225c3d0e70b8c6f6077663835438da8d5733f917598",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_java/archive/7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip",
+            "https://github.com/bazelbuild/rules_java/archive/7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip"
+        ]
+    },
+    "7e4afce6fe62dbff0a4a03450143146f9f2d7488.tar.gz": {
+        "name": "7e4afce6fe62dbff0a4a03450143146f9f2d7488.tar.gz",
+        "sha256": "8e7d59a5b12b233be5652e3d29f42fba01c7cbab09f6b3a8d0a57ed6d1e9a0da",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_proto/archive/7e4afce6fe62dbff0a4a03450143146f9f2d7488.tar.gz",
+            "https://github.com/bazelbuild/rules_proto/archive/7e4afce6fe62dbff0a4a03450143146f9f2d7488.tar.gz"
+        ]
+    },
+    "aecba11114cf1fac5497aeb844b6966106de3eb6.tar.gz": {
+        "name": "aecba11114cf1fac5497aeb844b6966106de3eb6.tar.gz",
+        "sha256": "9f385e146410a8150b6f4cb1a57eab7ec806ced48d427554b1e754877ff26c3e",
+        "urls": [
+            "https://mirror.bazel.build/github.com/google/re2/archive/aecba11114cf1fac5497aeb844b6966106de3eb6.tar.gz",
+            "https://github.com/google/re2/archive/aecba11114cf1fac5497aeb844b6966106de3eb6.tar.gz"
+        ]
+    },
+    "android_tools": {
+        "name": "android_tools",
+        "sha256": "ea5c0589a01e2a9f43c20e5c145d3530e3b3bdbe7322789bc5da38d0ca49b837",
+        "url": "https://mirror.bazel.build/bazel_android_tools/android_tools_pkg-0.19.0rc3.tar.gz"
+    },
+    "android_tools_for_testing": {
+        "name": "android_tools_for_testing",
+        "patch_cmds": [
+            "test -f BUILD && chmod u+w BUILD || true",
+            "echo >> BUILD",
+            "echo 'exports_files([\"WORKSPACE\"], visibility = [\"//visibility:public\"])' >> BUILD"
+        ],
+        "patch_cmds_win": [
+            "Add-Content -Path BUILD -Value \"`nexports_files([`\"WORKSPACE`\"], visibility = [`\"//visibility:public`\"])`n\" -Force"
+        ],
+        "sha256": "ea5c0589a01e2a9f43c20e5c145d3530e3b3bdbe7322789bc5da38d0ca49b837",
+        "url": "https://mirror.bazel.build/bazel_android_tools/android_tools_pkg-0.19.0rc3.tar.gz"
+    },
+    "android_tools_pkg-0.19.0rc3.tar.gz": {
+        "name": "android_tools_pkg-0.19.0rc3.tar.gz",
+        "sha256": "ea5c0589a01e2a9f43c20e5c145d3530e3b3bdbe7322789bc5da38d0ca49b837",
+        "urls": [
+            "https://mirror.bazel.build/bazel_android_tools/android_tools_pkg-0.19.0rc3.tar.gz"
+        ]
+    },
+    "b1c40e1de81913a3c40e5948f78719c28152486d.zip": {
+        "name": "b1c40e1de81913a3c40e5948f78719c28152486d.zip",
+        "sha256": "d0c573b94a6ef20ef6ff20154a23d0efcb409fb0e1ff0979cec318dfe42f0cdd",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_cc/archive/b1c40e1de81913a3c40e5948f78719c28152486d.zip",
+            "https://github.com/bazelbuild/rules_cc/archive/b1c40e1de81913a3c40e5948f78719c28152486d.zip"
+        ]
+    },
+    "bazel-skylib-1.0.3.tar.gz": {
+        "name": "bazel-skylib-1.0.3.tar.gz",
+        "sha256": "1c531376ac7e5a180e0237938a2536de0c54d93f5c278634818e0efc952dd56c",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/releases/download/1.0.3/bazel-skylib-1.0.3.tar.gz",
+            "https://github.com/bazelbuild/bazel-skylib/releases/download/1.0.3/bazel-skylib-1.0.3.tar.gz"
+        ]
+    },
+    "bazel-toolchains-3.1.0.tar.gz": {
+        "name": "bazel-toolchains-3.1.0.tar.gz",
+        "sha256": "726b5423e1c7a3866a3a6d68e7123b4a955e9fcbe912a51e0f737e6dab1d0af2",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/bazel-toolchains/releases/download/3.1.0/bazel-toolchains-3.1.0.tar.gz",
+            "https://github.com/bazelbuild/bazel-toolchains/releases/download/3.1.0/bazel-toolchains-3.1.0.tar.gz"
+        ]
+    },
+    "bazel_j2objc": {
+        "name": "bazel_j2objc",
+        "sha256": "8d3403b5b7db57e347c943d214577f6879e5b175c2b59b7e075c0b6453330e9b",
+        "strip_prefix": "j2objc-2.5",
+        "urls": [
+            "https://mirror.bazel.build/github.com/google/j2objc/releases/download/2.5/j2objc-2.5.zip",
+            "https://github.com/google/j2objc/releases/download/2.5/j2objc-2.5.zip"
+        ]
+    },
+    "bazel_skylib": {
+        "name": "bazel_skylib",
+        "patch_cmds": [
+            "test -f BUILD && chmod u+w BUILD || true",
+            "echo >> BUILD",
+            "echo 'exports_files([\"WORKSPACE\"], visibility = [\"//visibility:public\"])' >> BUILD"
+        ],
+        "patch_cmds_win": [
+            "Add-Content -Path BUILD -Value \"`nexports_files([`\"WORKSPACE`\"], visibility = [`\"//visibility:public`\"])`n\" -Force"
+        ],
+        "sha256": "1c531376ac7e5a180e0237938a2536de0c54d93f5c278634818e0efc952dd56c",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/releases/download/1.0.3/bazel-skylib-1.0.3.tar.gz",
+            "https://github.com/bazelbuild/bazel-skylib/releases/download/1.0.3/bazel-skylib-1.0.3.tar.gz"
+        ]
+    },
+    "bazel_toolchains": {
+        "name": "bazel_toolchains",
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+        "strip_prefix": "zulu11.37.17-ca-jdk11.0.6-macosx_x64",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.37.17-ca-jdk11.0.6/zulu11.37.17-ca-jdk11.0.6-macosx_x64.tar.gz"
+        ]
+    },
+    "remotejdk11_win": {
+        "build_file": "@bazel_tools//tools/jdk:jdk.BUILD",
+        "generator_function": "maybe",
+        "generator_name": "remotejdk11_win",
+        "name": "remotejdk11_win",
+        "sha256": "a9695617b8374bfa171f166951214965b1d1d08f43218db9a2a780b71c665c18",
+        "strip_prefix": "zulu11.37.17-ca-jdk11.0.6-win_x64",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.37.17-ca-jdk11.0.6/zulu11.37.17-ca-jdk11.0.6-win_x64.zip"
+        ]
+    },
+    "remotejdk11_win_for_testing": {
+        "build_file": "@local_jdk//:BUILD.bazel",
+        "name": "remotejdk11_win_for_testing",
+        "patch_cmds": [
+            "test -f BUILD.bazel && chmod u+w BUILD.bazel || true",
+            "echo >> BUILD.bazel",
+            "echo 'exports_files([\"WORKSPACE\"], visibility = [\"//visibility:public\"])' >> BUILD.bazel"
+        ],
+        "patch_cmds_win": [
+            "Add-Content -Path BUILD.bazel -Value \"`nexports_files([`\"WORKSPACE`\"], visibility = [`\"//visibility:public`\"])`n\" -Force"
+        ],
+        "sha256": "a9695617b8374bfa171f166951214965b1d1d08f43218db9a2a780b71c665c18",
+        "strip_prefix": "zulu11.37.17-ca-jdk11.0.6-win_x64",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.37.17-ca-jdk11.0.6/zulu11.37.17-ca-jdk11.0.6-win_x64.zip"
+        ]
+    },
+    "remotejdk14_linux": {
+        "build_file": "@bazel_tools//tools/jdk:jdk.BUILD",
+        "generator_function": "maybe",
+        "generator_name": "remotejdk14_linux",
+        "name": "remotejdk14_linux",
+        "sha256": "48bb8947034cd079ad1ef83335e7634db4b12a26743a0dc314b6b861480777aa",
+        "strip_prefix": "zulu14.28.21-ca-jdk14.0.1-linux_x64",
+        "urls": [
+            "https://mirror.bazel.build/cdn.azul.com/zulu/bin/zulu14.28.21-ca-jdk14.0.1-linux_x64.tar.gz"
+        ]
+    },
+    "remotejdk14_linux_for_testing": {
+        "build_file": "@local_jdk//:BUILD.bazel",
+        "name": "remotejdk14_linux_for_testing",
+        "patch_cmds": [
+            "test -f BUILD.bazel && chmod u+w BUILD.bazel || true",
+            "echo >> BUILD.bazel",
+            "echo 'exports_files([\"WORKSPACE\"], visibility = [\"//visibility:public\"])' >> BUILD.bazel"
+        ],
+        "patch_cmds_win": [
+            "Add-Content -Path BUILD.bazel -Value \"`nexports_files([`\"WORKSPACE`\"], visibility = [`\"//visibility:public`\"])`n\" -Force"
+        ],
+        "sha256": "48bb8947034cd079ad1ef83335e7634db4b12a26743a0dc314b6b861480777aa",
+        "strip_prefix": "zulu14.28.21-ca-jdk14.0.1-linux_x64",
+        "urls": [
+            "https://mirror.bazel.build/cdn.azul.com/zulu/bin/zulu14.28.21-ca-jdk14.0.1-linux_x64.tar.gz"
+        ]
+    },
+    "remotejdk14_macos": {
+        "build_file": "@bazel_tools//tools/jdk:jdk.BUILD",
+        "generator_function": "maybe",
+        "generator_name": "remotejdk14_macos",
+        "name": "remotejdk14_macos",
+        "sha256": "088bd4d0890acc9f032b738283bf0f26b2a55c50b02d1c8a12c451d8ddf080dd",
+        "strip_prefix": "zulu14.28.21-ca-jdk14.0.1-macosx_x64",
+        "urls": [
+            "https://mirror.bazel.build/cdn.azul.com/zulu/bin/zulu14.28.21-ca-jdk14.0.1-macosx_x64.tar.gz"
+        ]
+    },
+    "remotejdk14_macos_for_testing": {
+        "build_file": "@local_jdk//:BUILD.bazel",
+        "name": "remotejdk14_macos_for_testing",
+        "patch_cmds": [
+            "test -f BUILD.bazel && chmod u+w BUILD.bazel || true",
+            "echo >> BUILD.bazel",
+            "echo 'exports_files([\"WORKSPACE\"], visibility = [\"//visibility:public\"])' >> BUILD.bazel"
+        ],
+        "patch_cmds_win": [
+            "Add-Content -Path BUILD.bazel -Value \"`nexports_files([`\"WORKSPACE`\"], visibility = [`\"//visibility:public`\"])`n\" -Force"
+        ],
+        "sha256": "088bd4d0890acc9f032b738283bf0f26b2a55c50b02d1c8a12c451d8ddf080dd",
+        "strip_prefix": "zulu14.28.21-ca-jdk14.0.1-macosx_x64",
+        "urls": [
+            "https://mirror.bazel.build/cdn.azul.com/zulu/bin/zulu14.28.21-ca-jdk14.0.1-macosx_x64.tar.gz"
+        ]
+    },
+    "remotejdk14_win": {
+        "build_file": "@bazel_tools//tools/jdk:jdk.BUILD",
+        "generator_function": "maybe",
+        "generator_name": "remotejdk14_win",
+        "name": "remotejdk14_win",
+        "sha256": "9cb078b5026a900d61239c866161f0d9558ec759aa15c5b4c7e905370e868284",
+        "strip_prefix": "zulu14.28.21-ca-jdk14.0.1-win_x64",
+        "urls": [
+            "https://mirror.bazel.build/cdn.azul.com/zulu/bin/zulu14.28.21-ca-jdk14.0.1-win_x64.zip"
+        ]
+    },
+    "remotejdk14_win_for_testing": {
+        "build_file": "@local_jdk//:BUILD.bazel",
+        "name": "remotejdk14_win_for_testing",
+        "patch_cmds": [
+            "test -f BUILD.bazel && chmod u+w BUILD.bazel || true",
+            "echo >> BUILD.bazel",
+            "echo 'exports_files([\"WORKSPACE\"], visibility = [\"//visibility:public\"])' >> BUILD.bazel"
+        ],
+        "patch_cmds_win": [
+            "Add-Content -Path BUILD.bazel -Value \"`nexports_files([`\"WORKSPACE`\"], visibility = [`\"//visibility:public`\"])`n\" -Force"
+        ],
+        "sha256": "9cb078b5026a900d61239c866161f0d9558ec759aa15c5b4c7e905370e868284",
+        "strip_prefix": "zulu14.28.21-ca-jdk14.0.1-win_x64",
+        "urls": [
+            "https://mirror.bazel.build/cdn.azul.com/zulu/bin/zulu14.28.21-ca-jdk14.0.1-win_x64.zip"
+        ]
+    },
+    "remotejdk15_linux_for_testing": {
+        "build_file": "@local_jdk//:BUILD.bazel",
+        "name": "remotejdk15_linux_for_testing",
+        "patch_cmds": [
+            "test -f BUILD.bazel && chmod u+w BUILD.bazel || true",
+            "echo >> BUILD.bazel",
+            "echo 'exports_files([\"WORKSPACE\"], visibility = [\"//visibility:public\"])' >> BUILD.bazel"
+        ],
+        "patch_cmds_win": [
+            "Add-Content -Path BUILD.bazel -Value \"`nexports_files([`\"WORKSPACE`\"], visibility = [`\"//visibility:public`\"])`n\" -Force"
+        ],
+        "sha256": "0a38f1138c15a4f243b75eb82f8ef40855afcc402e3c2a6de97ce8235011b1ad",
+        "strip_prefix": "zulu15.27.17-ca-jdk15.0.0-linux_x64",
+        "urls": [
+            "https://mirror.bazel.build/cdn.azul.com/zulu/bin/zulu15.27.17-ca-jdk15.0.0-linux_x64.tar.gz",
+            "https://cdn.azul.com/zulu/bin/zulu15.27.17-ca-jdk15.0.0-linux_x64.tar.gz"
+        ]
+    },
+    "remotejdk15_macos_for_testing": {
+        "build_file": "@local_jdk//:BUILD.bazel",
+        "name": "remotejdk15_macos_for_testing",
+        "patch_cmds": [
+            "test -f BUILD.bazel && chmod u+w BUILD.bazel || true",
+            "echo >> BUILD.bazel",
+            "echo 'exports_files([\"WORKSPACE\"], visibility = [\"//visibility:public\"])' >> BUILD.bazel"
+        ],
+        "patch_cmds_win": [
+            "Add-Content -Path BUILD.bazel -Value \"`nexports_files([`\"WORKSPACE`\"], visibility = [`\"//visibility:public`\"])`n\" -Force"
+        ],
+        "sha256": "f80b2e0512d9d8a92be24497334c974bfecc8c898fc215ce0e76594f00437482",
+        "strip_prefix": "zulu15.27.17-ca-jdk15.0.0-macosx_x64",
+        "urls": [
+            "https://mirror.bazel.build/cdn.azul.com/zulu/bin/zulu15.27.17-ca-jdk15.0.0-macosx_x64.tar.gz",
+            "https://cdn.azul.com/zulu/bin/zulu15.27.17-ca-jdk15.0.0-macosx_x64.tar.gz"
+        ]
+    },
+    "remotejdk15_win_for_testing": {
+        "build_file": "@local_jdk//:BUILD.bazel",
+        "name": "remotejdk15_win_for_testing",
+        "patch_cmds": [
+            "test -f BUILD.bazel && chmod u+w BUILD.bazel || true",
+            "echo >> BUILD.bazel",
+            "echo 'exports_files([\"WORKSPACE\"], visibility = [\"//visibility:public\"])' >> BUILD.bazel"
+        ],
+        "patch_cmds_win": [
+            "Add-Content -Path BUILD.bazel -Value \"`nexports_files([`\"WORKSPACE`\"], visibility = [`\"//visibility:public`\"])`n\" -Force"
+        ],
+        "sha256": "f535a530151e6c20de8a3078057e332b08887cb3ba1a4735717357e72765cad6",
+        "strip_prefix": "zulu15.27.17-ca-jdk15.0.0-win_x64",
+        "urls": [
+            "https://mirror.bazel.build/cdn.azul.com/zulu/bin/zulu15.27.17-ca-jdk15.0.0-win_x64.zip",
+            "https://cdn.azul.com/zulu/bin/zulu15.27.17-ca-jdk15.0.0-win_x64.zip"
+        ]
+    },
+    "rules_cc": {
+        "name": "rules_cc",
+        "patch_cmds": [
+            "test -f BUILD && chmod u+w BUILD || true",
+            "echo >> BUILD",
+            "echo 'exports_files([\"WORKSPACE\"], visibility = [\"//visibility:public\"])' >> BUILD"
+        ],
+        "patch_cmds_win": [
+            "Add-Content -Path BUILD -Value \"`nexports_files([`\"WORKSPACE`\"], visibility = [`\"//visibility:public`\"])`n\" -Force"
+        ],
+        "sha256": "d0c573b94a6ef20ef6ff20154a23d0efcb409fb0e1ff0979cec318dfe42f0cdd",
+        "strip_prefix": "rules_cc-b1c40e1de81913a3c40e5948f78719c28152486d",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_cc/archive/b1c40e1de81913a3c40e5948f78719c28152486d.zip",
+            "https://github.com/bazelbuild/rules_cc/archive/b1c40e1de81913a3c40e5948f78719c28152486d.zip"
+        ]
+    },
+    "rules_java": {
+        "name": "rules_java",
+        "patch_cmds": [
+            "test -f BUILD && chmod u+w BUILD || true",
+            "echo >> BUILD",
+            "echo 'exports_files([\"WORKSPACE\"], visibility = [\"//visibility:public\"])' >> BUILD"
+        ],
+        "patch_cmds_win": [
+            "Add-Content -Path BUILD -Value \"`nexports_files([`\"WORKSPACE`\"], visibility = [`\"//visibility:public`\"])`n\" -Force"
+        ],
+        "sha256": "bc81f1ba47ef5cc68ad32225c3d0e70b8c6f6077663835438da8d5733f917598",
+        "strip_prefix": "rules_java-7cf3cefd652008d0a64a419c34c13bdca6c8f178",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_java/archive/7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip",
+            "https://github.com/bazelbuild/rules_java/archive/7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip"
+        ]
+    },
+    "rules_nodejs-2.2.2.tar.gz": {
+        "name": "rules_nodejs-2.2.2.tar.gz",
+        "sha256": "f2194102720e662dbf193546585d705e645314319554c6ce7e47d8b59f459e9c",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_nodejs/releases/download/2.2.2/rules_nodejs-2.2.2.tar.gz",
+            "https://github.com/bazelbuild/rules_nodejs/releases/download/2.2.2/rules_nodejs-2.2.2.tar.gz"
+        ]
+    },
+    "rules_pkg": {
+        "name": "rules_pkg",
+        "patch_cmds": [
+            "test -f BUILD && chmod u+w BUILD || true",
+            "echo >> BUILD",
+            "echo 'exports_files([\"WORKSPACE\"], visibility = [\"//visibility:public\"])' >> BUILD"
+        ],
+        "patch_cmds_win": [
+            "Add-Content -Path BUILD -Value \"`nexports_files([`\"WORKSPACE`\"], visibility = [`\"//visibility:public`\"])`n\" -Force"
+        ],
+        "sha256": "4ba8f4ab0ff85f2484287ab06c0d871dcb31cc54d439457d28fd4ae14b18450a",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_pkg/releases/download/0.2.4/rules_pkg-0.2.4.tar.gz",
+            "https://github.com/bazelbuild/rules_pkg/releases/download/0.2.4/rules_pkg-0.2.4.tar.gz"
+        ]
+    },
+    "rules_pkg-0.2.4.tar.gz": {
+        "name": "rules_pkg-0.2.4.tar.gz",
+        "sha256": "4ba8f4ab0ff85f2484287ab06c0d871dcb31cc54d439457d28fd4ae14b18450a",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_pkg/releases/download/0.2.4/rules_pkg-0.2.4.tar.gz",
+            "https://github.com/bazelbuild/rules_pkg/releases/download/0.2.4/rules_pkg-0.2.4.tar.gz"
+        ]
+    },
+    "rules_proto": {
+        "name": "rules_proto",
+        "patch_cmds": [
+            "test -f BUILD.bazel && chmod u+w BUILD.bazel || true",
+            "echo >> BUILD.bazel",
+            "echo 'exports_files([\"WORKSPACE\"], visibility = [\"//visibility:public\"])' >> BUILD.bazel"
+        ],
+        "patch_cmds_win": [
+            "Add-Content -Path BUILD.bazel -Value \"`nexports_files([`\"WORKSPACE`\"], visibility = [`\"//visibility:public`\"])`n\" -Force"
+        ],
+        "sha256": "8e7d59a5b12b233be5652e3d29f42fba01c7cbab09f6b3a8d0a57ed6d1e9a0da",
+        "strip_prefix": "rules_proto-7e4afce6fe62dbff0a4a03450143146f9f2d7488",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_proto/archive/7e4afce6fe62dbff0a4a03450143146f9f2d7488.tar.gz",
+            "https://github.com/bazelbuild/rules_proto/archive/7e4afce6fe62dbff0a4a03450143146f9f2d7488.tar.gz"
+        ]
+    },
+    "six": {
+        "build_file": "@com_github_grpc_grpc//third_party:six.BUILD",
+        "generator_function": "grpc_deps",
+        "generator_name": "six",
+        "name": "six",
+        "sha256": "d16a0141ec1a18405cd4ce8b4613101da75da0e9a7aec5bdd4fa804d0e0eba73",
+        "urls": [
+            "https://files.pythonhosted.org/packages/dd/bf/4138e7bfb757de47d1f4b6994648ec67a51efe58fa907c1e11e350cddfca/six-1.12.0.tar.gz"
+        ]
+    },
+    "upb": {
+        "generator_function": "grpc_deps",
+        "generator_name": "upb",
+        "name": "upb",
+        "sha256": "7992217989f3156f8109931c1fc6db3434b7414957cb82371552377beaeb9d6c",
+        "strip_prefix": "upb-382d5afc60e05470c23e8de19b19fc5ad231e732",
+        "urls": [
+            "https://storage.googleapis.com/grpc-bazel-mirror/github.com/protocolbuffers/upb/archive/382d5afc60e05470c23e8de19b19fc5ad231e732.tar.gz",
+            "https://github.com/protocolbuffers/upb/archive/382d5afc60e05470c23e8de19b19fc5ad231e732.tar.gz"
+        ]
+    },
+    "v1.32.0.tar.gz": {
+        "name": "v1.32.0.tar.gz",
+        "sha256": "f880ebeb2ccf0e47721526c10dd97469200e40b5f101a0d9774eb69efa0bd07a",
+        "urls": [
+            "https://mirror.bazel.build/github.com/grpc/grpc/archive/v1.32.0.tar.gz",
+            "https://github.com/grpc/grpc/archive/v1.32.0.tar.gz"
+        ]
+    },
+    "v3.13.0.tar.gz": {
+        "name": "v3.13.0.tar.gz",
+        "sha256": "9b4ee22c250fe31b16f1a24d61467e40780a3fbb9b91c3b65be2a376ed913a1a",
+        "urls": [
+            "https://mirror.bazel.build/github.com/protocolbuffers/protobuf/archive/v3.13.0.tar.gz",
+            "https://github.com/protocolbuffers/protobuf/archive/v3.13.0.tar.gz"
+        ]
+    },
+    "zlib": {
+        "build_file": "@com_github_grpc_grpc//third_party:zlib.BUILD",
+        "generator_function": "grpc_deps",
+        "generator_name": "zlib",
+        "name": "zlib",
+        "sha256": "6d4d6640ca3121620995ee255945161821218752b551a1a180f4215f7d124d45",
+        "strip_prefix": "zlib-cacf7f1d4e3d44d871b605da3b647f07d718623f",
+        "urls": [
+            "https://storage.googleapis.com/grpc-bazel-mirror/github.com/madler/zlib/archive/cacf7f1d4e3d44d871b605da3b647f07d718623f.tar.gz",
+            "https://github.com/madler/zlib/archive/cacf7f1d4e3d44d871b605da3b647f07d718623f.tar.gz"
+        ]
+    },
+    "zulu11.37.17-ca-jdk11.0.6-linux_x64.tar.gz": {
+        "name": "zulu11.37.17-ca-jdk11.0.6-linux_x64.tar.gz",
+        "sha256": "360626cc19063bc411bfed2914301b908a8f77a7919aaea007a977fa8fb3cde1",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.37.17-ca-jdk11.0.6/zulu11.37.17-ca-jdk11.0.6-linux_x64.tar.gz"
+        ]
+    },
+    "zulu11.37.17-ca-jdk11.0.6-macosx_x64.tar.gz": {
+        "name": "zulu11.37.17-ca-jdk11.0.6-macosx_x64.tar.gz",
+        "sha256": "e1fe56769f32e2aaac95e0a8f86b5a323da5af3a3b4bba73f3086391a6cc056f",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.37.17-ca-jdk11.0.6/zulu11.37.17-ca-jdk11.0.6-macosx_x64.tar.gz"
+        ]
+    },
+    "zulu11.37.17-ca-jdk11.0.6-win_x64.zip": {
+        "name": "zulu11.37.17-ca-jdk11.0.6-win_x64.zip",
+        "sha256": "a9695617b8374bfa171f166951214965b1d1d08f43218db9a2a780b71c665c18",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.37.17-ca-jdk11.0.6/zulu11.37.17-ca-jdk11.0.6-win_x64.zip"
+        ]
+    },
+    "zulu11.37.48-ca-jdk11.0.6-linux_aarch64.tar.gz": {
+        "name": "zulu11.37.48-ca-jdk11.0.6-linux_aarch64.tar.gz",
+        "sha256": "a452f1b9682d9f83c1c14e54d1446e1c51b5173a3a05dcb013d380f9508562e4",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.37.48-ca-jdk11.0.6/zulu11.37.48-ca-jdk11.0.6-linux_aarch64.tar.gz"
+        ]
+    }
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_4/update-srcDeps.py b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_4/update-srcDeps.py
new file mode 100755
index 000000000000..9e998e05875e
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_4/update-srcDeps.py
@@ -0,0 +1,54 @@
+#!/usr/bin/env python3
+import sys
+import json
+
+if len(sys.argv) != 2:
+    print("usage: ./this-script src-deps.json < WORKSPACE", file=sys.stderr)
+    print("Takes the bazel WORKSPACE file and reads all archives into a json dict (by evaling it as python code)", file=sys.stderr)
+    print("Hail Eris.", file=sys.stderr)
+    sys.exit(1)
+
+http_archives = []
+
+# just the kw args are the dict { name, sha256, urls … }
+def http_archive(**kw):
+    http_archives.append(kw)
+# like http_file
+def http_file(**kw):
+    http_archives.append(kw)
+
+# this is inverted from http_archive/http_file and bundles multiple archives
+def distdir_tar(**kw):
+    for archive_name in kw['archives']:
+        http_archives.append({
+            "name": archive_name,
+            "sha256": kw['sha256'][archive_name],
+            "urls": kw['urls'][archive_name]
+        })
+
+# TODO?
+def git_repository(**kw):
+    print(json.dumps(kw, sort_keys=True, indent=4), file=sys.stderr)
+    sys.exit(1)
+
+# execute the WORKSPACE like it was python code in this module,
+# using all the function stubs from above.
+exec(sys.stdin.read())
+
+# transform to a dict with the names as keys
+d = { el['name']: el for el in http_archives }
+
+def has_urls(el):
+    return ('url' in el and el['url']) or ('urls' in el and el['urls'])
+def has_sha256(el):
+    return 'sha256' in el and el['sha256']
+bad_archives = list(filter(lambda el: not has_urls(el) or not has_sha256(el), d.values()))
+if bad_archives:
+    print('Following bazel dependencies are missing url or sha256', file=sys.stderr)
+    print('Check bazel sources for master or non-checksummed dependencies', file=sys.stderr)
+    for el in bad_archives:
+        print(json.dumps(el, sort_keys=True, indent=4), file=sys.stderr)
+    sys.exit(1)
+
+with open(sys.argv[1], "w") as f:
+    print(json.dumps(d, sort_keys=True, indent=4), file=f)
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_rc.patch b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_rc.patch
new file mode 100644
index 000000000000..a599ac3ec723
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/bazel_rc.patch
@@ -0,0 +1,13 @@
+diff --git a/src/main/cpp/option_processor.cc b/src/main/cpp/option_processor.cc
+index 8f8f15685f..a7ae52d1e4 100644
+--- a/src/main/cpp/option_processor.cc
++++ b/src/main/cpp/option_processor.cc
+@@ -56,7 +56,7 @@ OptionProcessor::OptionProcessor(
+     : workspace_layout_(workspace_layout),
+       startup_options_(std::move(default_startup_options)),
+       parse_options_called_(false),
+-      system_bazelrc_path_(BAZEL_SYSTEM_BAZELRC_PATH) {}
++      system_bazelrc_path_("@bazelSystemBazelRCPath@") {}
+ 
+ OptionProcessor::OptionProcessor(
+     const WorkspaceLayout* workspace_layout,
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/buildtools/default.nix b/nixpkgs/pkgs/development/tools/build-managers/bazel/buildtools/default.nix
new file mode 100644
index 000000000000..441254ce263c
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/buildtools/default.nix
@@ -0,0 +1,28 @@
+{ lib, buildGoPackage, fetchFromGitHub }:
+
+buildGoPackage rec {
+  pname = "bazel-buildtools";
+  version = "3.5.0";
+
+  goPackagePath = "github.com/bazelbuild/buildtools";
+
+  src = fetchFromGitHub {
+    owner = "bazelbuild";
+    repo = "buildtools";
+    rev = version;
+    sha256 = "179k0kwh7i2azkhk8dw7ac50a05q7n3i29pqaf69yw7jrpbf8k85";
+  };
+
+  goDeps = ./deps.nix;
+
+  excludedPackages = [ "generatetables" ];
+
+  buildFlagsArray = [ "-ldflags=-s -w -X main.buildVersion=${version} -X main.buildScmRevision=${src.rev}" ];
+
+  meta = with lib; {
+    description = "Tools for working with Google's bazel buildtool. Includes buildifier, buildozer, and unused_deps";
+    homepage = "https://github.com/bazelbuild/buildtools";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ elasticdog uri-canva marsam ];
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/buildtools/deps.nix b/nixpkgs/pkgs/development/tools/build-managers/bazel/buildtools/deps.nix
new file mode 100644
index 000000000000..a64f96d2c072
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/buildtools/deps.nix
@@ -0,0 +1,20 @@
+[
+  {
+    goPackagePath = "github.com/golang/protobuf";
+    fetch = {
+      type = "git";
+      url = "https://github.com/golang/protobuf";
+      rev = "84668698ea25b64748563aa20726db66a6b8d299";
+      sha256 = "1gkd1942vk9n8kfzdwy1iil6wgvlwjq7a3y5jc49ck4lz9rhmgkq";
+    };
+  }
+  {
+    goPackagePath = "go.starlark.net";
+    fetch = {
+      type = "git";
+      url = "https://github.com/google/starlark-go";
+      rev = "6677ee5c7211380ec7e6a1b50dc45287e40ca9e1";
+      sha256 = "1dl8q1lwvmm38w2lzfwray2djdcq40z89yy6vzy387w0xrax0jj0";
+    };
+  }
+]
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/cpp-test.nix b/nixpkgs/pkgs/development/tools/build-managers/bazel/cpp-test.nix
new file mode 100644
index 000000000000..f4e03abdbc94
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/cpp-test.nix
@@ -0,0 +1,51 @@
+{
+  bazel
+, bazelTest
+, bazel-examples
+, gccStdenv
+, lib
+, runLocal
+, runtimeShell
+, writeScript
+, writeText
+, distDir
+}:
+
+let
+
+  toolsBazel = writeScript "bazel" ''
+    #! ${runtimeShell}
+
+    export CXX='${gccStdenv.cc}/bin/g++'
+    export LD='${gccStdenv.cc}/bin/ld'
+    export CC='${gccStdenv.cc}/bin/gcc'
+
+    # XXX: hack for macosX, this flags disable bazel usage of xcode
+    # See: https://github.com/bazelbuild/bazel/issues/4231
+    export BAZEL_USE_CPP_ONLY_TOOLCHAIN=1
+
+    exec "$BAZEL_REAL" "$@"
+  '';
+
+  workspaceDir = runLocal "our_workspace" {} (''
+    cp -r ${bazel-examples}/cpp-tutorial/stage3 $out
+    find $out -type d -exec chmod 755 {} \;
+  ''
+  + (lib.optionalString gccStdenv.isDarwin ''
+    mkdir $out/tools
+    cp ${toolsBazel} $out/tools/bazel
+  ''));
+
+  testBazel = bazelTest {
+    name = "bazel-test-cpp";
+    inherit workspaceDir;
+    bazelPkg = bazel;
+    bazelScript = ''
+      ${bazel}/bin/bazel \
+        build --verbose_failures \
+        --distdir=${distDir} \
+          //...
+    '';
+  };
+
+in testBazel
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/java-test.nix b/nixpkgs/pkgs/development/tools/build-managers/bazel/java-test.nix
new file mode 100644
index 000000000000..11931a197c0c
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/java-test.nix
@@ -0,0 +1,58 @@
+{
+  bazel
+, bazelTest
+, bazel-examples
+, gccStdenv
+, lib
+, openjdk8
+, runLocal
+, runtimeShell
+, writeScript
+, writeText
+, distDir
+}:
+
+let
+
+  toolsBazel = writeScript "bazel" ''
+    #! ${runtimeShell}
+
+    export CXX='${gccStdenv.cc}/bin/g++'
+    export LD='${gccStdenv.cc}/bin/ld'
+    export CC='${gccStdenv.cc}/bin/gcc'
+
+    # XXX: hack for macosX, this flags disable bazel usage of xcode
+    # See: https://github.com/bazelbuild/bazel/issues/4231
+    export BAZEL_USE_CPP_ONLY_TOOLCHAIN=1
+
+    exec "$BAZEL_REAL" "$@"
+  '';
+
+  workspaceDir = runLocal "our_workspace" {} (''
+    cp -r ${bazel-examples}/java-tutorial $out
+    find $out -type d -exec chmod 755 {} \;
+  ''
+  + (lib.optionalString gccStdenv.isDarwin ''
+    mkdir $out/tools
+    cp ${toolsBazel} $out/tools/bazel
+  ''));
+
+  testBazel = bazelTest {
+    name = "bazel-test-java";
+    inherit workspaceDir;
+    bazelPkg = bazel;
+    buildInputs = [ openjdk8 ];
+    bazelScript = ''
+      ${bazel}/bin/bazel \
+        run \
+        --distdir=${distDir} \
+          --host_javabase='@local_jdk//:jdk' \
+          --java_toolchain='@bazel_tools//tools/jdk:toolchain_hostjdk8' \
+          --javabase='@local_jdk//:jdk' \
+          --verbose_failures \
+          //:ProjectRunner
+    '';
+  };
+
+in testBazel
+
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/nix-hacks.patch b/nixpkgs/pkgs/development/tools/build-managers/bazel/nix-hacks.patch
new file mode 100644
index 000000000000..95f07646802e
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/nix-hacks.patch
@@ -0,0 +1,43 @@
+diff --git a/src/main/java/com/google/devtools/build/lib/rules/repository/RepositoryDelegatorFunction.java b/src/main/java/com/google/devtools/build/lib/rules/repository/RepositoryDelegatorFunction.java
+index 8e772005cd..6ffa1c919c 100644
+--- a/src/main/java/com/google/devtools/build/lib/rules/repository/RepositoryDelegatorFunction.java
++++ b/src/main/java/com/google/devtools/build/lib/rules/repository/RepositoryDelegatorFunction.java
+@@ -432,25 +432,7 @@ public final class RepositoryDelegatorFunction implements SkyFunction {
+       String content;
+       try {
+         content = FileSystemUtils.readContent(markerPath, StandardCharsets.UTF_8);
+-        String markerRuleKey = readMarkerFile(content, markerData);
+-        boolean verified = false;
+-        if (Preconditions.checkNotNull(ruleKey).equals(markerRuleKey)
+-            && Objects.equals(
+-                markerData.get(MANAGED_DIRECTORIES_MARKER),
+-                this.markerData.get(MANAGED_DIRECTORIES_MARKER))) {
+-          verified = handler.verifyMarkerData(rule, markerData, env);
+-          if (env.valuesMissing()) {
+-            return null;
+-          }
+-        }
+-
+-        if (verified) {
+-          return new Fingerprint().addString(content).digestAndReset();
+-        } else {
+-          // So that we are in a consistent state if something happens while fetching the repository
+-          markerPath.delete();
+-          return null;
+-        }
++        return new Fingerprint().addString(content).digestAndReset();
+       } catch (IOException e) {
+         throw new RepositoryFunctionException(e, Transience.TRANSIENT);
+       }
+diff --git a/src/main/java/com/google/devtools/build/lib/shell/JavaSubprocessFactory.java b/src/main/java/com/google/devtools/build/lib/shell/JavaSubprocessFactory.java
+index c282d57ab6..f9b0c08627 100644
+--- a/src/main/java/com/google/devtools/build/lib/shell/JavaSubprocessFactory.java
++++ b/src/main/java/com/google/devtools/build/lib/shell/JavaSubprocessFactory.java
+@@ -146,7 +146,6 @@ public class JavaSubprocessFactory implements SubprocessFactory {
+     ProcessBuilder builder = new ProcessBuilder();
+     builder.command(params.getArgv());
+     if (params.getEnv() != null) {
+-      builder.environment().clear();
+       builder.environment().putAll(params.getEnv());
+     }
+ 
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/protobuf-test.nix b/nixpkgs/pkgs/development/tools/build-managers/bazel/protobuf-test.nix
new file mode 100644
index 000000000000..3858a681659b
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/protobuf-test.nix
@@ -0,0 +1,176 @@
+{
+  bazel
+, bazelTest
+, fetchFromGitHub
+, fetchurl
+, gccStdenv
+, lib
+, openjdk8
+, runLocal
+, runtimeShell
+, writeScript
+, writeText
+, distDir
+}:
+
+let
+  com_google_protobuf = fetchFromGitHub {
+    owner = "protocolbuffers";
+    repo = "protobuf";
+    rev = "v3.13.0";
+    sha256 = "1nqsvi2yfr93kiwlinz8z7c68ilg1j75b2vcpzxzvripxx5h6xhd";
+  };
+
+  bazel_skylib = fetchFromGitHub {
+    owner = "bazelbuild";
+    repo = "bazel-skylib";
+    rev = "2ec2e6d715e993d96ad6222770805b5bd25399ae";
+    sha256 = "1z2r2vx6kj102zvp3j032djyv99ski1x1sl4i3p6mswnzrzna86s";
+  };
+
+  rules_python = fetchFromGitHub {
+    owner = "bazelbuild";
+    repo = "rules_python";
+    rev = "c8c79aae9aa1b61d199ad03d5fe06338febd0774";
+    sha256 = "1zn58wv5wcylpi0xj7riw34i1jjpqahanxx8y9srwrv0v93b6pqz";
+  };
+
+  rules_proto = fetchFromGitHub {
+    owner = "bazelbuild";
+    repo = "rules_proto";
+    rev = "a0761ed101b939e19d83b2da5f59034bffc19c12";
+    sha256 = "09lqfj5fxm1fywxr5w8pnpqd859gb6751jka9fhxjxjzs33glhqf";
+  };
+
+  net_zlib = fetchurl rec {
+    url = "https://zlib.net/zlib-1.2.11.tar.gz";
+    sha256 = "c3e5e9fdd5004dcb542feda5ee4f0ff0744628baf8ed2dd5d66f8ca1197cb1a1";
+
+    passthru.sha256 = sha256;
+  };
+
+  WORKSPACE = writeText "WORKSPACE" ''
+    workspace(name = "our_workspace")
+
+    load("//:proto-support.bzl", "protobuf_deps")
+    protobuf_deps()
+    load("@rules_proto//proto:repositories.bzl", "rules_proto_toolchains")
+    rules_proto_toolchains()
+    '';
+
+  protoSupport = writeText "proto-support.bzl" ''
+    """Load dependencies needed to compile the protobuf library as a 3rd-party consumer."""
+
+    load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+    def protobuf_deps():
+        """Loads common dependencies needed to compile the protobuf library."""
+
+        if "zlib" not in native.existing_rules():
+            # proto_library, cc_proto_library, and java_proto_library rules implicitly
+            # depend on @com_google_protobuf for protoc and proto runtimes.
+            # This statement defines the @com_google_protobuf repo.
+            native.local_repository(
+                name = "com_google_protobuf",
+                path = "${com_google_protobuf}",
+            )
+            native.local_repository(
+                name = "bazel_skylib",
+                path = "${bazel_skylib}",
+            )
+            native.local_repository(
+                name = "rules_proto",
+                path = "${rules_proto}",
+            )
+            native.local_repository(
+                name = "rules_python",
+                path = "${rules_python}",
+            )
+
+            http_archive(
+                name = "zlib",
+                build_file = "@com_google_protobuf//:third_party/zlib.BUILD",
+                sha256 = "${net_zlib.sha256}",
+                strip_prefix = "zlib-1.2.11",
+                urls = ["file://${net_zlib}"],
+            )
+  '';
+
+  personProto = writeText "person.proto" ''
+    syntax = "proto3";
+
+    package person;
+
+    message Person {
+      string name = 1;
+      int32 id = 2;
+      string email = 3;
+    }
+  '';
+
+  personBUILD = writeText "BUILD" ''
+    load("@rules_proto//proto:defs.bzl", "proto_library")
+
+    proto_library(
+        name = "person_proto",
+        srcs = ["person.proto"],
+        visibility = ["//visibility:public"],
+    )
+
+    java_proto_library(
+        name = "person_java_proto",
+        deps = [":person_proto"],
+    )
+
+    cc_proto_library(
+        name = "person_cc_proto",
+        deps = [":person_proto"],
+    )
+  '';
+
+  toolsBazel = writeScript "bazel" ''
+    #! ${runtimeShell}
+
+    export CXX='${gccStdenv.cc}/bin/g++'
+    export LD='${gccStdenv.cc}/bin/ld'
+    export CC='${gccStdenv.cc}/bin/gcc'
+
+    # XXX: hack for macosX, this flags disable bazel usage of xcode
+    # See: https://github.com/bazelbuild/bazel/issues/4231
+    export BAZEL_USE_CPP_ONLY_TOOLCHAIN=1
+
+    exec "$BAZEL_REAL" "$@"
+  '';
+
+  workspaceDir = runLocal "our_workspace" {} (''
+    mkdir $out
+    cp ${WORKSPACE} $out/WORKSPACE
+    touch $out/BUILD.bazel
+    cp ${protoSupport} $out/proto-support.bzl
+    mkdir $out/person
+    cp ${personProto} $out/person/person.proto
+    cp ${personBUILD} $out/person/BUILD.bazel
+  ''
+  + (lib.optionalString gccStdenv.isDarwin ''
+    mkdir $out/tools
+    cp ${toolsBazel} $out/tools/bazel
+  ''));
+
+  testBazel = bazelTest {
+    name = "bazel-test-protocol-buffers";
+    inherit workspaceDir;
+    bazelPkg = bazel;
+    buildInputs = [ openjdk8 ];
+    bazelScript = ''
+      ${bazel}/bin/bazel \
+        build \
+        --distdir=${distDir} \
+          --host_javabase='@local_jdk//:jdk' \
+          --java_toolchain='@bazel_tools//tools/jdk:toolchain_hostjdk8' \
+          --javabase='@local_jdk//:jdk' \
+          --verbose_failures \
+          //...
+    '';
+  };
+
+in testBazel
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/python-bin-path-test.nix b/nixpkgs/pkgs/development/tools/build-managers/bazel/python-bin-path-test.nix
new file mode 100644
index 000000000000..c02547c08e06
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/python-bin-path-test.nix
@@ -0,0 +1,53 @@
+{ writeText, bazel, bazelTest, runLocal, distDir }:
+
+let
+  WORKSPACE = writeText "WORKSPACE" ''
+    workspace(name = "our_workspace")
+  '';
+
+  pythonLib = writeText "lib.py" ''
+    def foo():
+      return 43
+  '';
+
+  pythonBin = writeText "bin.py" ''
+    from lib import foo
+
+    assert foo() == 43
+  '';
+
+  pythonBUILD = writeText "BUILD" ''
+    py_library(
+      name = "lib",
+      srcs = [ "lib.py" ],
+    )
+
+    py_binary(
+      name = "bin",
+      srcs = [ "bin.py" ],
+      deps = [ ":lib" ],
+    )
+  '';
+
+  workspaceDir = runLocal "our_workspace" {} ''
+    mkdir $out
+    cp ${WORKSPACE} $out/WORKSPACE
+    mkdir $out/python
+    cp ${pythonLib} $out/python/lib.py
+    cp ${pythonBin} $out/python/bin.py
+    cp ${pythonBUILD} $out/python/BUILD.bazel
+  '';
+
+  testBazel = bazelTest {
+    name = "bazel-test-builtin-rules";
+    inherit workspaceDir;
+    bazelPkg = bazel;
+    bazelScript = ''
+      ${bazel}/bin/bazel \
+        run \
+      --distdir=${distDir} \
+          //python:bin
+    '';
+  };
+
+in testBazel
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/shebang-test.nix b/nixpkgs/pkgs/development/tools/build-managers/bazel/shebang-test.nix
new file mode 100644
index 000000000000..fd94f97a7659
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/shebang-test.nix
@@ -0,0 +1,49 @@
+{
+  bazel
+, bazelTest
+, distDir
+, extracted
+, runLocal
+, unzip
+}:
+
+# Tests that all shebangs are patched appropriately.
+# #!/usr/bin/... should be replaced by Nix store references.
+# #!.../bin/env python should be replaced by Nix store reference to the python interpreter.
+
+let
+
+  workspaceDir = runLocal "our_workspace" {} "mkdir $out";
+
+  testBazel = bazelTest {
+    name = "bazel-test-shebangs";
+    inherit workspaceDir;
+    bazelPkg = bazel;
+    bazelScript = ''
+      set -ueo pipefail
+      FAIL=
+      check_shebangs() {
+        local dir="$1"
+        { grep -Re '#!/usr/bin' $dir && FAIL=1; } || true
+        { grep -Re '#![^[:space:]]*/bin/env' $dir && FAIL=1; } || true
+      }
+      BAZEL_EXTRACTED=${extracted bazel}/install
+      check_shebangs $BAZEL_EXTRACTED
+      while IFS= read -r -d "" zip; do
+        unzipped="./$zip/UNPACKED"
+        mkdir -p "$unzipped"
+        unzip -qq $zip -d "$unzipped"
+        check_shebangs "$unzipped"
+        rm -rf unzipped
+      done < <(find $BAZEL_EXTRACTED -type f -name '*.zip' -or -name '*.jar' -print0)
+      if [[ $FAIL = 1 ]]; then
+        echo "Found files in the bazel distribution with illegal shebangs." >&2
+        echo "Replace those by explicit Nix store paths." >&2
+        echo "Python scripts should not use \`bin/env python' but the Python interpreter's store path." >&2
+        exit 1
+      fi
+    '';
+    buildInputs = [ unzip ];
+  };
+
+in testBazel
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/strict_action_env.patch b/nixpkgs/pkgs/development/tools/build-managers/bazel/strict_action_env.patch
new file mode 100644
index 000000000000..1402c20f6bdb
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/strict_action_env.patch
@@ -0,0 +1,13 @@
+diff --git a/src/main/java/com/google/devtools/build/lib/bazel/rules/BazelRuleClassProvider.java b/src/main/java/com/google/devtools/build/lib/bazel/rules/BazelRuleClassProvider.java
+index a70b5559bc..10bdffe961 100644
+--- a/src/main/java/com/google/devtools/build/lib/bazel/rules/BazelRuleClassProvider.java
++++ b/src/main/java/com/google/devtools/build/lib/bazel/rules/BazelRuleClassProvider.java
+@@ -466,7 +466,7 @@ public class BazelRuleClassProvider {
+       // Note that --action_env does not propagate to the host config, so it is not a viable
+       // workaround when a genrule is itself built in the host config (e.g. nested genrules). See
+       // #8536.
+-      return "/bin:/usr/bin:/usr/local/bin";
++      return "@strictActionEnvPatch@";
+     }
+
+     String newPath = "";
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/trim-last-argument-to-gcc-if-empty.patch b/nixpkgs/pkgs/development/tools/build-managers/bazel/trim-last-argument-to-gcc-if-empty.patch
new file mode 100644
index 000000000000..b93b252f3638
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/trim-last-argument-to-gcc-if-empty.patch
@@ -0,0 +1,37 @@
+From 177b4720d6fbaa7fdd17e5e11b2c79ac8f246786 Mon Sep 17 00:00:00 2001
+From: "Wael M. Nasreddine" <wael.nasreddine@gmail.com>
+Date: Thu, 27 Jun 2019 21:08:51 -0700
+Subject: [PATCH] Trim last argument to gcc if empty, on Darwin
+
+On Darwin, the last argument to GCC is coming up as an empty string.
+This is breaking the build of proto_library targets. However, I was not
+able to reproduce with the example cpp project[0].
+
+This commit removes the last argument if it's an empty string. This is
+not a problem on Linux.
+
+[0]: https://github.com/bazelbuild/examples/tree/master/cpp-tutorial/stage3
+---
+ tools/cpp/osx_cc_wrapper.sh.tpl | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/tools/cpp/osx_cc_wrapper.sh.tpl b/tools/cpp/osx_cc_wrapper.sh.tpl
+index 4c85cd9b6b..6c611e3d25 100644
+--- a/tools/cpp/osx_cc_wrapper.sh.tpl
++++ b/tools/cpp/osx_cc_wrapper.sh.tpl
+@@ -53,7 +53,11 @@ done
+ %{env}
+ 
+ # Call the C++ compiler
+-%{cc} "$@"
++if [[ ${*: -1} = "" ]]; then
++    %{cc} "${@:0:$#}"
++else
++    %{cc} "$@"
++fi
+ 
+ function get_library_path() {
+     for libdir in ${LIB_DIRS}; do
+-- 
+2.19.2
+
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bazel/update-srcDeps.py b/nixpkgs/pkgs/development/tools/build-managers/bazel/update-srcDeps.py
new file mode 100755
index 000000000000..4105aeeb11bc
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bazel/update-srcDeps.py
@@ -0,0 +1,62 @@
+#!/usr/bin/env python3
+import sys
+import json
+
+if len(sys.argv) == 1:
+    print("usage: ./this-script WORKSPACE", file=sys.stderr)
+    print("Takes the bazel WORKSPACE file and reads all archives into a json dict (by evaling it as python code)", file=sys.stderr)
+    print("Hail Eris.", file=sys.stderr)
+    sys.exit(1)
+
+http_archives = []
+
+# just the kw args are the dict { name, sha256, urls … }
+def http_archive(**kw):
+    http_archives.append(kw)
+# like http_file
+def http_file(**kw):
+    http_archives.append(kw)
+
+# this is inverted from http_archive/http_file and bundles multiple archives
+def distdir_tar(**kw):
+    for archive_name in kw['archives']:
+        http_archives.append({
+            "name": archive_name,
+            "sha256": kw['sha256'][archive_name],
+            "urls": kw['urls'][archive_name]
+        })
+
+# stubs for symbols we are not interested in
+# might need to be expanded if new bazel releases add symbols to the workspace
+def workspace(name): pass
+def load(*args): pass
+def bind(**kw): pass
+def list_source_repository(**kw): pass
+def new_local_repository(**kw): pass
+def local_repository(**kw): pass
+DOC_VERSIONS = []
+def stardoc_repositories(**kw): pass
+def skydoc_repositories(**kw): pass
+def rules_sass_dependencies(**kw): pass
+def node_repositories(**kw): pass
+def sass_repositories(**kw): pass
+def register_execution_platforms(*args): pass
+def rbe_autoconfig(*args, **kw): pass
+def rules_pkg_dependencies(*args, **kw): pass
+def winsdk_configure(*args, **kw): pass
+def register_local_rc_exe_toolchains(*args, **kw): pass
+def register_toolchains(*args, **kw): pass
+def debian_deps(): pass
+def grpc_deps(): pass
+def grpc_extra_deps(): pass
+def bazel_skylib_workspace(): pass
+
+# execute the WORKSPACE like it was python code in this module,
+# using all the function stubs from above.
+with open(sys.argv[1]) as f:
+    exec(f.read())
+
+# transform to a dict with the names as keys
+d = { el['name']: el for el in http_archives }
+
+print(json.dumps(d, sort_keys=True, indent=4))
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bear/default.nix b/nixpkgs/pkgs/development/tools/build-managers/bear/default.nix
new file mode 100644
index 000000000000..e7b0c1d105b4
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bear/default.nix
@@ -0,0 +1,66 @@
+{ lib, stdenv
+, fetchFromGitHub
+, cmake
+, pkg-config
+, grpc
+, protobuf
+, openssl
+, nlohmann_json
+, gtest
+, fmt
+, spdlog
+, c-ares
+, abseil-cpp
+, zlib
+, sqlite
+, re2
+}:
+
+stdenv.mkDerivation rec {
+  pname = "bear";
+  version = "3.0.9";
+
+  src = fetchFromGitHub {
+    owner = "rizsotto";
+    repo = pname;
+    rev = version;
+    sha256 = "xac8PYo3qYjtQbDy8piOz5BQQpcVlAvMCv1qHrVZmPQ=";
+  };
+
+  nativeBuildInputs = [ cmake pkg-config ];
+
+  buildInputs = [
+    grpc
+    protobuf
+    openssl
+    nlohmann_json
+    gtest
+    fmt
+    spdlog
+    c-ares
+    abseil-cpp
+    zlib
+    sqlite
+    re2
+  ];
+
+  patches = [
+    # Default libexec would be set to /nix/store/*-bear//nix/store/*-bear/libexec/...
+    ./no-double-relative.patch
+  ];
+
+  meta = with lib; {
+    description = "Tool that generates a compilation database for clang tooling";
+    longDescription = ''
+      Note: the bear command is very useful to generate compilation commands
+      e.g. for YouCompleteMe.  You just enter your development nix-shell
+      and run `bear make`.  It's not perfect, but it gets a long way.
+    '';
+    homepage = "https://github.com/rizsotto/Bear";
+    license = licenses.gpl3Plus;
+    platforms = platforms.unix;
+    maintainers = [ maintainers.babariviere ];
+    # ld: symbol(s) not found for architecture x86_64
+    broken = stdenv.isDarwin;
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bear/no-double-relative.patch b/nixpkgs/pkgs/development/tools/build-managers/bear/no-double-relative.patch
new file mode 100644
index 000000000000..f4d247fa5760
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bear/no-double-relative.patch
@@ -0,0 +1,14 @@
+diff --git a/source/config.h.in b/source/config.h.in
+index 728c234..a3e76c6 100644
+--- a/source/config.h.in
++++ b/source/config.h.in
+@@ -65,6 +65,6 @@ constexpr char VERSION[] = "@CMAKE_PROJECT_VERSION@";
+ 
+ constexpr char CITNAMES_DEFAULT_PATH[] = "@ROOT_INSTALL_PREFIX@/@CMAKE_INSTALL_BINDIR@/citnames";
+ constexpr char INTERCEPT_DEFAULT_PATH[] = "@ROOT_INSTALL_PREFIX@/@CMAKE_INSTALL_BINDIR@/intercept";
+-constexpr char LIBRARY_DEFAULT_PATH[] = "@ROOT_INSTALL_PREFIX@/@CMAKE_INSTALL_LIBEXECDIR@/@CMAKE_SHARED_LIBRARY_PREFIX@exec@CMAKE_SHARED_LIBRARY_SUFFIX@";
+-constexpr char WRAPPER_DEFAULT_PATH[] = "@ROOT_INSTALL_PREFIX@/@CMAKE_INSTALL_LIBEXECDIR@/wrapper";
+-constexpr char WRAPPER_DIR_DEFAULT_PATH[] = "@ROOT_INSTALL_PREFIX@/@CMAKE_INSTALL_LIBEXECDIR@/wrapper.d";
++constexpr char LIBRARY_DEFAULT_PATH[] = "@CMAKE_INSTALL_LIBEXECDIR@/@CMAKE_SHARED_LIBRARY_PREFIX@exec@CMAKE_SHARED_LIBRARY_SUFFIX@";
++constexpr char WRAPPER_DEFAULT_PATH[] = "@CMAKE_INSTALL_LIBEXECDIR@/wrapper";
++constexpr char WRAPPER_DIR_DEFAULT_PATH[] = "@CMAKE_INSTALL_LIBEXECDIR@/wrapper.d";
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bloop/default.nix b/nixpkgs/pkgs/development/tools/build-managers/bloop/default.nix
new file mode 100644
index 000000000000..1b4f74f91d43
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bloop/default.nix
@@ -0,0 +1,92 @@
+{ stdenv
+, fetchurl
+, coursier
+, autoPatchelfHook
+, installShellFiles
+, jre
+, lib
+, zlib
+}:
+
+stdenv.mkDerivation rec {
+  pname = "bloop";
+  version = "1.4.8";
+
+  bloop-coursier-channel = fetchurl {
+    url = "https://github.com/scalacenter/bloop/releases/download/v${version}/bloop-coursier.json";
+    sha256 = "1hfd5gc98bp4p4m85jva2mlkh10q10n9s5136z8620mmjq93rx70";
+  };
+
+  bloop-bash = fetchurl {
+    url = "https://github.com/scalacenter/bloop/releases/download/v${version}/bash-completions";
+    sha256 = "1ldxlqv353gvhdn4yq7z506ywvnjv6fjsi8wigwhzg89876pwsys";
+  };
+
+  bloop-fish = fetchurl {
+    url = "https://github.com/scalacenter/bloop/releases/download/v${version}/fish-completions";
+    sha256 = "1pa8h81l2498q8dbd83fzipr99myjwxpy8xdgzhvqzdmfv6aa4m0";
+  };
+
+  bloop-zsh = fetchurl {
+    url = "https://github.com/scalacenter/bloop/releases/download/v${version}/zsh-completions";
+    sha256 = "1xzg0qfkjdmzm3mvg82mc4iia8cl7b6vbl8ng4ir2xsz00zjrlsq";
+  };
+
+  bloop-coursier = stdenv.mkDerivation rec {
+    name = "${pname}-coursier-${version}";
+
+    platform = if stdenv.isLinux && stdenv.isx86_64 then "x86_64-pc-linux"
+               else if stdenv.isDarwin && stdenv.isx86_64 then "x86_64-apple-darwin"
+               else throw "unsupported platform";
+
+    phases = [ "installPhase" ];
+    installPhase = ''
+      export COURSIER_CACHE=$(pwd)
+      export COURSIER_JVM_CACHE=$(pwd)
+
+      mkdir channel
+      ln -s ${bloop-coursier-channel} channel/bloop.json
+      ${coursier}/bin/coursier install --install-dir $out --install-platform ${platform} --default-channels=false --channel channel --only-prebuilt=true bloop
+
+      # Remove binary part of the coursier launcher script to make derivation output hash stable
+      sed -i '5,$ d' $out/bloop
+   '';
+
+    outputHashMode = "recursive";
+    outputHashAlgo = "sha256";
+    outputHash = if stdenv.isLinux && stdenv.isx86_64 then "1cs3ng6bj9s7xf6c4xaiqgg5qr34abnipfgc44sy2ljklr7x0jwa"
+      else if stdenv.isDarwin && stdenv.isx86_64 then "0l9vqvzcmxya1s04cps96skw4dslh3i3ks73dl53ing50zb0ga9r"
+      else throw "unsupported platform";
+  };
+
+  dontUnpack = true;
+  nativeBuildInputs = [ autoPatchelfHook installShellFiles ];
+  buildInputs = [ stdenv.cc.cc.lib zlib ];
+  propagatedBuildInputs = [ jre ];
+
+  installPhase = ''
+    export COURSIER_CACHE=$(pwd)
+    export COURSIER_JVM_CACHE=$(pwd)
+
+    mkdir -p $out/bin
+    cp ${bloop-coursier}/bloop $out/bloop
+    cp ${bloop-coursier}/.bloop.aux $out/.bloop.aux
+    ln -s $out/bloop $out/bin/bloop
+
+    # patch the bloop launcher so that it works when symlinked
+    sed "s|\$(dirname \"\$0\")|$out|" -i $out/bloop
+
+    #Install completions
+    installShellCompletion --name bloop --bash ${bloop-bash}
+    installShellCompletion --name _bloop --zsh ${bloop-zsh}
+    installShellCompletion --name bloop.fish --fish ${bloop-fish}
+  '';
+
+  meta = with lib; {
+    homepage = "https://scalacenter.github.io/bloop/";
+    license = licenses.asl20;
+    description = "A Scala build server and command-line tool to make the compile and test developer workflows fast and productive in a build-tool-agnostic way";
+    platforms = [ "x86_64-linux" "x86_64-darwin" ];
+    maintainers = with maintainers; [ tomahna ];
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bmake/bootstrap-fix.patch b/nixpkgs/pkgs/development/tools/build-managers/bmake/bootstrap-fix.patch
new file mode 100644
index 000000000000..9b1267257ad1
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bmake/bootstrap-fix.patch
@@ -0,0 +1,10 @@
+--- bmake/make-bootstrap.sh.in.orig     2019-02-19 10:55:21.733606117 -0800
++++ bmake/make-bootstrap.sh.in  2019-02-19 10:56:02.150771541 -0800
+@@ -4,6 +4,7 @@
+ 
+ srcdir=@srcdir@
+ 
++prefix="@prefix@"
+ DEFAULT_SYS_PATH="@default_sys_path@"
+ 
+ case "@use_meta@" in
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bmake/default.nix b/nixpkgs/pkgs/development/tools/build-managers/bmake/default.nix
new file mode 100644
index 000000000000..e1e9b348503c
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bmake/default.nix
@@ -0,0 +1,28 @@
+{ lib, stdenv, fetchurl
+, getopt
+}:
+
+stdenv.mkDerivation rec {
+  pname = "bmake";
+  version = "20200902";
+
+  src = fetchurl {
+    url    = "http://www.crufty.net/ftp/pub/sjg/${pname}-${version}.tar.gz";
+    sha256 = "1v1v81llsiy8qbpy38nml1x08dhrihwh040pqgwbwb9zy1108b08";
+  };
+
+  nativeBuildInputs = [ getopt ];
+
+  patches = [
+    ./bootstrap-fix.patch
+    ./fix-unexport-env-test.patch
+  ];
+
+  meta = with lib; {
+    description = "Portable version of NetBSD 'make'";
+    homepage    = "http://www.crufty.net/help/sjg/bmake.html";
+    license     = licenses.bsd3;
+    platforms   = platforms.unix;
+    maintainers = with maintainers; [ thoughtpolice ];
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/bmake/fix-unexport-env-test.patch b/nixpkgs/pkgs/development/tools/build-managers/bmake/fix-unexport-env-test.patch
new file mode 100644
index 000000000000..339348f37c32
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/bmake/fix-unexport-env-test.patch
@@ -0,0 +1,13 @@
+--- bmake/unit-tests/unexport-env.mk.orig       2019-02-19 10:24:14.356713136 -0800
++++ bmake/unit-tests/unexport-env.mk    2019-02-19 10:25:43.838775388 -0800
+@@ -3,8 +3,8 @@
+ # pick up a bunch of exported vars
+ .include "export.mk"
+ 
+-# an example of setting up a minimal environment.
+-PATH = /bin:/usr/bin:/sbin:/usr/sbin
++# preserve PATH so commands used in the "all" target are still available
++PATH := ${PATH}
+ 
+ # now clobber the environment to just PATH and UT_TEST
+ UT_TEST = unexport-env
diff --git a/nixpkgs/pkgs/development/tools/build-managers/boot/builder.sh b/nixpkgs/pkgs/development/tools/build-managers/boot/builder.sh
new file mode 100644
index 000000000000..c1481dc6a144
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/boot/builder.sh
@@ -0,0 +1,13 @@
+source $stdenv/setup
+
+boot_bin=$out/bin/boot
+
+mkdir -pv $(dirname $boot_bin)
+cp -v $src $boot_bin
+chmod -v 755 $boot_bin
+
+patchShebangs $boot_bin
+
+sed -i \
+    -e "s;\${BOOT_JAVA_COMMAND:-java};\${BOOT_JAVA_COMMAND:-${jdk}/bin/java};g" \
+    $boot_bin
diff --git a/nixpkgs/pkgs/development/tools/build-managers/boot/default.nix b/nixpkgs/pkgs/development/tools/build-managers/boot/default.nix
new file mode 100644
index 000000000000..68a4d5f44eaa
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/boot/default.nix
@@ -0,0 +1,25 @@
+{ lib, stdenv, fetchurl, jdk }:
+
+stdenv.mkDerivation rec {
+  version = "2.7.2";
+  pname = "boot";
+
+  src = fetchurl {
+    url = "https://github.com/boot-clj/boot-bin/releases/download/${version}/boot.sh";
+    sha256 = "1hqp3xxmsj5vkym0l3blhlaq9g3w0lhjgmp37g6y3rr741znkk8c";
+  };
+
+  inherit jdk;
+
+  builder = ./builder.sh;
+
+  propagatedBuildInputs = [ jdk ];
+
+  meta = with lib; {
+    description = "Build tooling for Clojure";
+    homepage = "https://boot-clj.com/";
+    license = licenses.epl10;
+    platforms = platforms.linux ++ platforms.darwin;
+    maintainers = with maintainers; [ ragge ];
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/buck/default.nix b/nixpkgs/pkgs/development/tools/build-managers/buck/default.nix
new file mode 100644
index 000000000000..0fbcb95704b0
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/buck/default.nix
@@ -0,0 +1,43 @@
+{ lib, stdenv, fetchFromGitHub, jdk, ant, python2, python2Packages, watchman, bash, makeWrapper }:
+
+stdenv.mkDerivation rec {
+  pname = "buck";
+  version = "2019.10.17.01";
+
+  src = fetchFromGitHub {
+    owner = "facebook";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "1irgp8yq1z11bq3b83yxvj35wqqq7y7b8q4d4y0hc05ac19ja0vj";
+  };
+
+  patches = [ ./pex-mtime.patch ];
+
+  postPatch = ''
+    grep -l -r '/bin/bash' --null | xargs -0 sed -i -e "s!/bin/bash!${bash}/bin/bash!g"
+  '';
+
+  buildInputs = [ jdk ant python2 watchman python2Packages.pywatchman ];
+  nativeBuildInputs = [ makeWrapper ];
+
+  buildPhase = ''
+    ant
+
+    PYTHONDONTWRITEBYTECODE=true ./bin/buck build -c buck.release_version=${version} buck
+  '';
+
+  installPhase = ''
+    install -D -m755 buck-out/gen/programs/buck.pex $out/bin/buck
+    wrapProgram $out/bin/buck \
+      --prefix PYTHONPATH : $PYTHONPATH \
+      --prefix PATH : "${lib.makeBinPath [jdk watchman]}"
+  '';
+
+  meta = with lib; {
+    homepage = "https://buck.build/";
+    description = "A high-performance build tool";
+    maintainers = [ maintainers.jgertm maintainers.marsam ];
+    license = licenses.asl20;
+    platforms = platforms.all;
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/buck/pex-mtime.patch b/nixpkgs/pkgs/development/tools/build-managers/buck/pex-mtime.patch
new file mode 100644
index 000000000000..b8726e64a604
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/buck/pex-mtime.patch
@@ -0,0 +1,13 @@
+diff --git a/third-party/py/pex/pex/common.py b/third-party/py/pex/pex/common.py
+index 76459ce23..eff411b20 100644
+--- a/third-party/py/pex/pex/common.py
++++ b/third-party/py/pex/pex/common.py
+@@ -328,4 +328,7 @@ class Chroot(object):
+   def zip(self, filename, mode='wb'):
+     with contextlib.closing(zipfile.ZipFile(filename, mode)) as zf:
+       for f in sorted(self.files()):
+-        zf.write(os.path.join(self.chroot, f), arcname=f, compress_type=zipfile.ZIP_DEFLATED)
++        path = os.path.join(self.chroot, f)
++        instant = 615532801
++        os.utime(path, (instant, instant))
++        zf.write(path, arcname=f, compress_type=zipfile.ZIP_DEFLATED)
diff --git a/nixpkgs/pkgs/development/tools/build-managers/cmake/2.8.nix b/nixpkgs/pkgs/development/tools/build-managers/cmake/2.8.nix
new file mode 100644
index 000000000000..9dabd7b35560
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/cmake/2.8.nix
@@ -0,0 +1,87 @@
+{ lib, stdenv, fetchurl, fetchpatch, curl, expat, zlib, bzip2
+, useNcurses ? false, ncurses, useQt4 ? false, qt4, ps
+}:
+
+with lib;
+
+assert stdenv ? cc;
+assert stdenv.cc ? libc;
+
+let
+  os = lib.optionalString;
+  majorVersion = "2.8";
+  minorVersion = "12.2";
+  version = "${majorVersion}.${minorVersion}";
+in
+
+stdenv.mkDerivation rec {
+  name = "cmake-${os useNcurses "cursesUI-"}${os useQt4 "qt4UI-"}${version}";
+
+  inherit majorVersion;
+
+  src = fetchurl {
+    url = "${meta.homepage}files/v${majorVersion}/cmake-${version}.tar.gz";
+    sha256 = "0phf295a9cby0v7zqdswr238v5aiy3rb2fs6dz39zjxbmzlp8rcc";
+  };
+
+  enableParallelBuilding = true;
+
+  patches =
+    [(fetchpatch { # see https://www.cmake.org/Bug/view.php?id=13959
+      name = "FindFreetype-2.5.patch";
+      url = "https://public.kitware.com/Bug/file/4660/0001-Support-finding-freetype2-using-pkg-config.patch";
+      sha256 = "136z63ff83hnwd247cq4m8m8164pklzyl5i2csf5h6wd8p01pdkj";
+    })] ++
+    # Don't search in non-Nix locations such as /usr, but do search in our libc.
+    [ ./search-path-2.8.patch ] ++
+    optional (stdenv.hostPlatform != stdenv.buildPlatform) (fetchurl {
+      name = "fix-darwin-cross-compile.patch";
+      url = "https://public.kitware.com/Bug/file_download.php?"
+          + "file_id=4981&type=bug";
+      sha256 = "16acmdr27adma7gs9rs0dxdiqppm15vl3vv3agy7y8s94wyh4ybv";
+    });
+
+  postPatch = ''
+    substituteInPlace Utilities/cmlibarchive/CMakeLists.txt \
+      --replace '"-framework CoreServices"' '""'
+  '';
+
+  buildInputs = [ setupHook curl expat zlib bzip2 ]
+    ++ optional useNcurses ncurses
+    ++ optional useQt4 qt4;
+
+  propagatedBuildInputs = [ ps ];
+
+  CMAKE_PREFIX_PATH = concatStringsSep ":"
+    (concatMap (p: [ (p.dev or p) (p.out or p) ]) buildInputs);
+
+  configureFlags = [
+    "--docdir=/share/doc/${name}"
+    "--mandir=/share/man"
+    "--system-libs"
+    "--no-system-libarchive"
+   ] ++ lib.optional useQt4 "--qt-gui";
+
+  setupHook = ./setup-hook.sh;
+
+  dontUseCmakeConfigure = true;
+
+  preConfigure = with stdenv; ''
+      fixCmakeFiles .
+      substituteInPlace Modules/Platform/UnixPaths.cmake \
+        --subst-var-by libc_bin ${getBin cc.libc} \
+        --subst-var-by libc_dev ${getDev cc.libc} \
+        --subst-var-by libc_lib ${getLib cc.libc}
+      configureFlags="--parallel=''${NIX_BUILD_CORES:-1} $configureFlags"
+    '';
+
+  hardeningDisable = [ "format" ];
+
+  meta = {
+    homepage = "https://cmake.org";
+    description = "Cross-Platform Makefile Generator";
+    platforms = if useQt4 then qt4.meta.platforms else lib.platforms.unix;
+    maintainers = with lib.maintainers; [ xfix ];
+    license = lib.licenses.bsd3;
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/cmake/3.2.2-cygwin.patch b/nixpkgs/pkgs/development/tools/build-managers/cmake/3.2.2-cygwin.patch
new file mode 100644
index 000000000000..982aba17e874
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/cmake/3.2.2-cygwin.patch
@@ -0,0 +1,274 @@
+--- cmake-3.2.2/Source/cmFileCommand.cxx	2015-04-13 19:09:00.000000000 +0200
++++ cmake-3.2.2/Source/ccmFileCommand.cxx	2015-06-10 11:02:27.345598700 +0200
+@@ -1179,7 +1179,7 @@
+   MatchProperties CollectMatchProperties(const char* file)
+     {
+     // Match rules are case-insensitive on some platforms.
+-#if defined(_WIN32) || defined(__APPLE__) || defined(__CYGWIN__)
++#if defined(_WIN32) || defined(__APPLE__)
+     std::string lower = cmSystemTools::LowerCase(file);
+     const char* file_to_match = lower.c_str();
+ #else
+--- cmake-3.2.2/Source/cmInstallCommand.cxx	2015-04-13 19:09:00.000000000 +0200
++++ cmake-3.2.2/Source/cmInstallCommand.cxx	2015-06-10 11:04:19.257935200 +0200
+@@ -1138,7 +1138,7 @@
+       {
+       literal_args += " REGEX \"";
+     // Match rules are case-insensitive on some platforms.
+-#if defined(_WIN32) || defined(__APPLE__) || defined(__CYGWIN__)
++#if defined(_WIN32) || defined(__APPLE__)
+       std::string regex = cmSystemTools::LowerCase(args[i]);
+ #else
+       std::string regex = args[i];
+--- cmake-3.2.2/Source/kwsys/Glob.cxx	2015-04-13 19:09:00.000000000 +0200
++++ cmake-3.2.2/Source/kwsys/Glob.cxx	2015-06-10 11:05:51.602674000 +0200
+@@ -37,7 +37,7 @@
+ #include <string.h>
+ namespace KWSYS_NAMESPACE
+ {
+-#if defined(_WIN32) || defined(__APPLE__) || defined(__CYGWIN__)
++#if defined(_WIN32) || defined(__APPLE__)
+ // On Windows and apple, no difference between lower and upper case
+ # define KWSYS_GLOB_CASE_INDEPENDENT
+ #endif
+--- cmake-3.2.2/Source/kwsys/SystemInformation.cxx	2015-04-13 19:09:00.000000000 +0200
++++ cmake-3.2.2/Source/kwsys/SystemInformation.cxx	2015-06-10 11:13:00.308303500 +0200
+@@ -911,7 +911,7 @@
+ // Hide implementation details in an anonymous namespace.
+ namespace {
+ // *****************************************************************************
+-#if defined(__linux) || defined(__APPLE__)
++#if defined(__linux) || defined(__APPLE__) || defined(__CYGWIN__)
+ int LoadLines(
+       FILE *file,
+       kwsys_stl::vector<kwsys_stl::string> &lines)
+@@ -947,7 +947,7 @@
+   return nRead;
+ }
+ 
+-# if defined(__linux)
++# if defined(__linux) || defined(__CYGWIN__)
+ // *****************************************************************************
+ int LoadLines(
+       const char *fileName,
+@@ -986,7 +986,7 @@
+ }
+ #endif
+ 
+-#if defined(__linux)
++#if defined(__linux) || defined(__CYGWIN__)
+ // ****************************************************************************
+ template<typename T>
+ int GetFieldsFromFile(
+@@ -3132,7 +3132,6 @@
+     pos = buffer.find("processor\t",pos+1);
+     }
+ 
+-#ifdef __linux
+   // Find the largest physical id.
+   int maxId = -1;
+   kwsys_stl::string idc =
+@@ -3165,14 +3164,6 @@
+             atoi(this->ExtractValueFromCpuInfoFile(buffer,"ncpus active").c_str());
+     }
+ 
+-#else // __CYGWIN__
+-  // does not have "physical id" entries, neither "cpu cores"
+-  // this has to be fixed for hyper-threading.
+-  kwsys_stl::string cpucount =
+-    this->ExtractValueFromCpuInfoFile(buffer,"cpu count");
+-  this->NumberOfPhysicalCPU=
+-    this->NumberOfLogicalCPU = atoi(cpucount.c_str());
+-#endif
+   // gotta have one, and if this is 0 then we get a / by 0n
+   // better to have a bad answer than a crash
+   if(this->NumberOfPhysicalCPU <= 0)
+@@ -3370,7 +3361,7 @@
+   GlobalMemoryStatusEx(&statex);
+   return statex.ullTotalPhys/1024;
+ # endif
+-#elif defined(__linux)
++#elif defined(__linux) || defined(__CYGWIN__)
+   SystemInformation::LongLong memTotal=0;
+   int ierr=GetFieldFromFile("/proc/meminfo","MemTotal:",memTotal);
+   if (ierr)
+@@ -3501,7 +3492,7 @@
+   GlobalMemoryStatusEx(&statex);
+   return (statex.ullTotalPhys - statex.ullAvailPhys)/1024;
+ # endif
+-#elif defined(__linux)
++#elif defined(__linux) || defined(__CYGWIN__)
+   const char *names[3]={"MemTotal:","MemFree:",NULL};
+   SystemInformation::LongLong values[2]={SystemInformation::LongLong(0)};
+   int ierr=GetFieldsFromFile("/proc/meminfo",names,values);
+@@ -3560,7 +3551,7 @@
+     return -2;
+     }
+   return pmc.WorkingSetSize/1024;
+-#elif defined(__linux)
++#elif defined(__linux) || defined(__CYGWIN__)
+   SystemInformation::LongLong memUsed=0;
+   int ierr=GetFieldFromFile("/proc/self/status","VmRSS:",memUsed);
+   if (ierr)
+@@ -3612,7 +3603,7 @@
+ {
+ #if defined(_WIN32)
+   return GetCurrentProcessId();
+-#elif defined(__linux) || defined(__APPLE__)
++#elif defined(__linux) || defined(__APPLE__) || defined(__CYGWIN__)
+   return getpid();
+ #else
+   return -1;
+--- cmake-3.2.2/Source/kwsys/SystemTools.cxx	2015-04-13 19:09:00.000000000 +0200
++++ cmake-3.2.2/Source/kwsys/SystemTools.cxx	2015-06-10 11:21:58.980443200 +0200
+@@ -93,19 +93,12 @@
+ # if defined(_MSC_VER) && _MSC_VER >= 1800
+ #  define KWSYS_WINDOWS_DEPRECATED_GetVersionEx
+ # endif
+-#elif defined (__CYGWIN__)
+-# include <windows.h>
+-# undef _WIN32
+ #endif
+ 
+ #if !KWSYS_CXX_HAS_ENVIRON_IN_STDLIB_H
+ extern char **environ;
+ #endif
+ 
+-#ifdef __CYGWIN__
+-# include <sys/cygwin.h>
+-#endif
+-
+ // getpwnam doesn't exist on Windows and Cray Xt3/Catamount
+ // same for TIOCGWINSZ
+ #if defined(_WIN32) || defined (__LIBCATAMOUNT__)
+@@ -1148,15 +1141,7 @@
+     {
+     return false;
+     }
+-#if defined(__CYGWIN__)
+-  // Convert filename to native windows path if possible.
+-  char winpath[MAX_PATH];
+-  if(SystemTools::PathCygwinToWin32(filename.c_str(), winpath))
+-    {
+-    return (GetFileAttributesA(winpath) != INVALID_FILE_ATTRIBUTES);
+-    }
+-  return access(filename.c_str(), R_OK) == 0;
+-#elif defined(_WIN32)
++#if defined(_WIN32)
+   return (GetFileAttributesW(
+             SystemTools::ConvertToWindowsExtendedPath(filename).c_str())
+           != INVALID_FILE_ATTRIBUTES);
+@@ -1190,28 +1175,6 @@
+ }
+ 
+ //----------------------------------------------------------------------------
+-#ifdef __CYGWIN__
+-bool SystemTools::PathCygwinToWin32(const char *path, char *win32_path)
+-{
+-  SystemToolsTranslationMap::iterator i =
+-    SystemTools::Cyg2Win32Map->find(path);
+-
+-  if (i != SystemTools::Cyg2Win32Map->end())
+-    {
+-    strncpy(win32_path, i->second.c_str(), MAX_PATH);
+-    }
+-  else
+-    {
+-    if(cygwin_conv_path(CCP_POSIX_TO_WIN_A, path, win32_path, MAX_PATH) != 0)
+-      {
+-      win32_path[0] = 0;
+-      }
+-    SystemToolsTranslationMap::value_type entry(path, win32_path);
+-    SystemTools::Cyg2Win32Map->insert(entry);
+-    }
+-  return win32_path[0] != 0;
+-}
+-#endif
+ 
+ bool SystemTools::Touch(const kwsys_stl::string& filename, bool create)
+ {
+@@ -4307,7 +4270,7 @@
+ 
+ bool SystemTools::FileIsFullPath(const char* in_name, size_t len)
+ {
+-#if defined(_WIN32) || defined(__CYGWIN__)
++#if defined(_WIN32)
+   // On Windows, the name must be at least two characters long.
+   if(len < 2)
+     {
+@@ -5078,9 +5041,6 @@
+ static unsigned int SystemToolsManagerCount;
+ SystemToolsTranslationMap *SystemTools::TranslationMap;
+ SystemToolsTranslationMap *SystemTools::LongPathMap;
+-#ifdef __CYGWIN__
+-SystemToolsTranslationMap *SystemTools::Cyg2Win32Map;
+-#endif
+ 
+ // SystemToolsManager manages the SystemTools singleton.
+ // SystemToolsManager should be included in any translation unit
+@@ -5126,9 +5086,6 @@
+   // Allocate the translation map first.
+   SystemTools::TranslationMap = new SystemToolsTranslationMap;
+   SystemTools::LongPathMap = new SystemToolsTranslationMap;
+-#ifdef __CYGWIN__
+-  SystemTools::Cyg2Win32Map = new SystemToolsTranslationMap;
+-#endif
+ 
+   // Add some special translation paths for unix.  These are not added
+   // for windows because drive letters need to be maintained.  Also,
+@@ -5183,9 +5140,6 @@
+ {
+   delete SystemTools::TranslationMap;
+   delete SystemTools::LongPathMap;
+-#ifdef __CYGWIN__
+-  delete SystemTools::Cyg2Win32Map;
+-#endif
+ }
+ 
+ 
+--- cmake-3.2.2/Source/kwsys/SystemTools.hxx.in	2015-04-13 19:09:00.000000000 +0200
++++ cmake-3.2.2/Source/kwsys/SystemTools.hxx.in	2015-06-10 11:24:24.271286600 +0200
+@@ -298,15 +298,6 @@
+   static bool FileExists(const kwsys_stl::string& filename);
+ 
+   /**
+-   * Converts Cygwin path to Win32 path. Uses dictionary container for
+-   * caching and calls to cygwin_conv_to_win32_path from Cygwin dll
+-   * for actual translation.  Returns true on success, else false.
+-   */
+-#ifdef __CYGWIN__
+-  static bool PathCygwinToWin32(const char *path, char *win32_path);
+-#endif
+-
+-  /**
+    * Return file length
+    */
+   static unsigned long FileLength(const kwsys_stl::string& filename);
+@@ -942,9 +933,6 @@
+    */
+   static SystemToolsTranslationMap *TranslationMap;
+   static SystemToolsTranslationMap *LongPathMap;
+-#ifdef __CYGWIN__
+-  static SystemToolsTranslationMap *Cyg2Win32Map;
+-#endif
+   friend class SystemToolsManager;
+ };
+ 
+--- cmake-3.2.2/Modules/FindCurses.cmake	2015-04-13 19:09:00.000000000 +0200
++++ cmake-3.2.2/Modules/FindCurses.cmake	2015-06-10 12:10:19.682030300 +0200
+@@ -60,15 +60,6 @@
+ if(CURSES_NCURSES_LIBRARY  AND ((NOT CURSES_CURSES_LIBRARY) OR CURSES_NEED_NCURSES))
+   set(CURSES_USE_NCURSES TRUE)
+ endif()
+-# http://cygwin.com/ml/cygwin-announce/2010-01/msg00002.html
+-# cygwin ncurses stopped providing curses.h symlinks see above
+-# message.  Cygwin is an ncurses package, so force ncurses on
+-# cygwin if the curses.h is missing
+-if(CYGWIN)
+-  if(NOT EXISTS /usr/include/curses.h)
+-    set(CURSES_USE_NCURSES TRUE)
+-  endif()
+-endif()
+ 
+ 
+ # Not sure the logic is correct here.
diff --git a/nixpkgs/pkgs/development/tools/build-managers/cmake/application-services.patch b/nixpkgs/pkgs/development/tools/build-managers/cmake/application-services.patch
new file mode 100644
index 000000000000..f64e220eb29b
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/cmake/application-services.patch
@@ -0,0 +1,45 @@
+diff --git a/Source/CMakeLists.txt b/Source/CMakeLists.txt
+index 1b6bb00d4c..487114daa8 100644
+--- a/Source/CMakeLists.txt
++++ b/Source/CMakeLists.txt
+@@ -893,7 +893,6 @@ endif()
+ # On Apple we need CoreFoundation and CoreServices
+ if(APPLE)
+   target_link_libraries(CMakeLib "-framework CoreFoundation")
+-  target_link_libraries(CMakeLib "-framework CoreServices")
+ endif()
+ 
+ if(WIN32 AND NOT UNIX)
+diff --git a/Source/cmGlobalXCodeGenerator.cxx b/Source/cmGlobalXCodeGenerator.cxx
+index a5ce5d18f4..3d6838ce82 100644
+--- a/Source/cmGlobalXCodeGenerator.cxx
++++ b/Source/cmGlobalXCodeGenerator.cxx
+@@ -43,11 +43,10 @@
+ 
+ struct cmLinkImplementation;
+ 
+ #if !defined(CMAKE_BOOTSTRAP) && defined(__APPLE__)
+-#  define HAVE_APPLICATION_SERVICES
+-#  include <ApplicationServices/ApplicationServices.h>
++#  include <CoreFoundation/CoreFoundation.h>
+ #endif
+
+ #if !defined(CMAKE_BOOTSTRAP)
+ #  include "cmXMLParser.h"
+ 
+diff --git a/Utilities/cmlibarchive/CMakeLists.txt b/Utilities/cmlibarchive/CMakeLists.txt
+index bfcaf30bb7..1da540aee5 100644
+--- a/Utilities/cmlibarchive/CMakeLists.txt
++++ b/Utilities/cmlibarchive/CMakeLists.txt
+@@ -2007,11 +2007,6 @@ IF(ENABLE_TEST)
+ ENDIF(ENABLE_TEST)
+ ENDIF()
+ 
+-# We need CoreServices on Mac OS.
+-IF(APPLE)
+-  LIST(APPEND ADDITIONAL_LIBS "-framework CoreServices")
+-ENDIF(APPLE)
+-
+ add_subdirectory(libarchive)
+ IF(0) # CMake does not build libarchive's command-line tools.
+ add_subdirectory(cat)
diff --git a/nixpkgs/pkgs/development/tools/build-managers/cmake/default.nix b/nixpkgs/pkgs/development/tools/build-managers/cmake/default.nix
new file mode 100644
index 000000000000..65e1b553875b
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/cmake/default.nix
@@ -0,0 +1,132 @@
+{ stdenv, lib, fetchurl, pkg-config
+, bzip2, curlMinimal, expat, libarchive, xz, zlib, libuv, rhash
+, buildPackages
+# darwin attributes
+, ps
+, isBootstrap ? false
+, useSharedLibraries ? (!isBootstrap && !stdenv.isCygwin)
+, useOpenSSL ? !isBootstrap, openssl
+, useNcurses ? false, ncurses
+, useQt4 ? false, qt4
+, withQt5 ? false, qtbase
+}:
+
+assert withQt5 -> useQt4 == false;
+assert useQt4 -> withQt5 == false;
+
+stdenv.mkDerivation (rec {
+  pname = "cmake"
+          + lib.optionalString isBootstrap "-boot"
+          + lib.optionalString useNcurses "-cursesUI"
+          + lib.optionalString withQt5 "-qt5UI"
+          + lib.optionalString useQt4 "-qt4UI";
+  version = "3.19.6";
+
+  src = fetchurl {
+    url = "${meta.homepage}files/v${lib.versions.majorMinor version}/cmake-${version}.tar.gz";
+    # compare with https://cmake.org/files/v${lib.versions.majorMinor version}/cmake-${version}-SHA-256.txt
+    sha256 = "sha256-7IerZ8RfR8QoXyBCgMXN5I4ckgz8/tFVWyf7OxodILo=";
+  };
+
+  patches = [
+    # Don't search in non-Nix locations such as /usr, but do search in our libc.
+    ./search-path.patch
+
+    # Don't depend on frameworks.
+    ./application-services.patch
+
+    # Derived from https://github.com/libuv/libuv/commit/1a5d4f08238dd532c3718e210078de1186a5920d
+    ./libuv-application-services.patch
+
+  ] ++ lib.optional stdenv.isCygwin ./3.2.2-cygwin.patch;
+
+  outputs = [ "out" ];
+  setOutputFlags = false;
+
+  setupHook = ./setup-hook.sh;
+
+  depsBuildBuild = [ buildPackages.stdenv.cc ];
+
+  nativeBuildInputs = [ setupHook pkg-config ];
+
+  buildInputs = []
+    ++ lib.optionals useSharedLibraries [ bzip2 curlMinimal expat libarchive xz zlib libuv rhash ]
+    ++ lib.optional useOpenSSL openssl
+    ++ lib.optional useNcurses ncurses
+    ++ lib.optional useQt4 qt4
+    ++ lib.optional withQt5 qtbase;
+
+  propagatedBuildInputs = lib.optional stdenv.isDarwin ps;
+
+  preConfigure = ''
+    fixCmakeFiles .
+    substituteInPlace Modules/Platform/UnixPaths.cmake \
+      --subst-var-by libc_bin ${lib.getBin stdenv.cc.libc} \
+      --subst-var-by libc_dev ${lib.getDev stdenv.cc.libc} \
+      --subst-var-by libc_lib ${lib.getLib stdenv.cc.libc}
+  ''
+  # CC_FOR_BUILD and CXX_FOR_BUILD are used to bootstrap cmake
+  + ''
+    configureFlags="--parallel=''${NIX_BUILD_CORES:-1} CC=$CC_FOR_BUILD CXX=$CXX_FOR_BUILD $configureFlags"
+  '';
+
+  configureFlags = [
+    "--docdir=share/doc/${pname}${version}"
+  ] ++ (if useSharedLibraries then [ "--no-system-jsoncpp" "--system-libs" ] else [ "--no-system-libs" ]) # FIXME: cleanup
+    ++ lib.optional (useQt4 || withQt5) "--qt-gui"
+    # Workaround https://gitlab.kitware.com/cmake/cmake/-/issues/20568
+    ++ lib.optionals stdenv.hostPlatform.is32bit [
+      "CFLAGS=-D_FILE_OFFSET_BITS=64"
+      "CXXFLAGS=-D_FILE_OFFSET_BITS=64"
+    ]
+    ++ [
+    "--"
+    # We should set the proper `CMAKE_SYSTEM_NAME`.
+    # http://www.cmake.org/Wiki/CMake_Cross_Compiling
+    #
+    # Unfortunately cmake seems to expect absolute paths for ar, ranlib, and
+    # strip. Otherwise they are taken to be relative to the source root of the
+    # package being built.
+    "-DCMAKE_CXX_COMPILER=${stdenv.cc.targetPrefix}c++"
+    "-DCMAKE_C_COMPILER=${stdenv.cc.targetPrefix}cc"
+    "-DCMAKE_AR=${lib.getBin stdenv.cc.bintools.bintools}/bin/${stdenv.cc.targetPrefix}ar"
+    "-DCMAKE_RANLIB=${lib.getBin stdenv.cc.bintools.bintools}/bin/${stdenv.cc.targetPrefix}ranlib"
+    "-DCMAKE_STRIP=${lib.getBin stdenv.cc.bintools.bintools}/bin/${stdenv.cc.targetPrefix}strip"
+
+    "-DCMAKE_USE_OPENSSL=${if useOpenSSL then "ON" else "OFF"}"
+    # Avoid depending on frameworks.
+    "-DBUILD_CursesDialog=${if useNcurses then "ON" else "OFF"}"
+  ];
+
+  # make install attempts to use the just-built cmake
+  preInstall = lib.optional (stdenv.hostPlatform != stdenv.buildPlatform) ''
+    sed -i 's|bin/cmake|${buildPackages.cmakeMinimal}/bin/cmake|g' Makefile
+  '';
+
+  dontUseCmakeConfigure = true;
+  enableParallelBuilding = true;
+
+  # This isn't an autoconf configure script; triples are passed via
+  # CMAKE_SYSTEM_NAME, etc.
+  configurePlatforms = [ ];
+
+  doCheck = false; # fails
+
+  meta = with lib; {
+    homepage = "https://cmake.org/";
+    changelog = "https://cmake.org/cmake/help/v${lib.versions.majorMinor version}/"
+      + "release/${lib.versions.majorMinor version}.html";
+    description = "Cross-Platform Makefile Generator";
+    longDescription = ''
+      CMake is an open-source, cross-platform family of tools designed to
+      build, test and package software. CMake is used to control the software
+      compilation process using simple platform and compiler independent
+      configuration files, and generate native makefiles and workspaces that
+      can be used in the compiler environment of your choice.
+    '';
+    platforms = if useQt4 then qt4.meta.platforms else platforms.all;
+    maintainers = with maintainers; [ ttuegel lnl7 ];
+    license = licenses.bsd3;
+  };
+} // (if withQt5 then { dontWrapQtApps = true; } else {})
+)
diff --git a/nixpkgs/pkgs/development/tools/build-managers/cmake/libuv-application-services.patch b/nixpkgs/pkgs/development/tools/build-managers/cmake/libuv-application-services.patch
new file mode 100644
index 000000000000..6607a9c6ed1f
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/cmake/libuv-application-services.patch
@@ -0,0 +1,55 @@
+diff --git a/Utilities/cmlibuv/CMakeLists.txt b/Utilities/cmlibuv/CMakeLists.txt
+index 7625cf65d9..167903e309 100644
+--- a/Utilities/cmlibuv/CMakeLists.txt
++++ b/Utilities/cmlibuv/CMakeLists.txt
+@@ -193,6 +193,22 @@ if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
+     src/unix/kqueue.c
+     src/unix/proctitle.c
+     )
++
++  include(CheckIncludeFile)
++
++  check_include_file("ApplicationServices/ApplicationServices.h" HAVE_ApplicationServices)
++  if (HAVE_ApplicationServices)
++    list(APPEND uv_defines
++      HAVE_APPLICATIONSERVICES_APPLICATIONSERVICES_H=1
++      )
++  endif()
++
++  check_include_file("CoreServices/CoreServices.h" HAVE_CoreServices)
++  if (HAVE_CoreServices)
++    list(APPEND uv_defines
++      HAVE_CORESERVICES_CORESERVICES_H=1
++      )
++  endif()
+ endif()
+ 
+ if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
+diff --git a/Utilities/cmlibuv/src/unix/fsevents.c b/Utilities/cmlibuv/src/unix/fsevents.c
+index a51f29b3f6..3f6bf01968 100644
+--- a/Utilities/cmlibuv/src/unix/fsevents.c
++++ b/Utilities/cmlibuv/src/unix/fsevents.c
+@@ -21,7 +21,7 @@
+ #include "uv.h"
+ #include "internal.h"
+ 
+-#if TARGET_OS_IPHONE || MAC_OS_X_VERSION_MAX_ALLOWED < 1070
++#if !HAVE_CORESERVICES_CORESERVICES_H || MAC_OS_X_VERSION_MAX_ALLOWED < 1070
+ 
+ /* iOS (currently) doesn't provide the FSEvents-API (nor CoreServices) */
+ /* macOS prior to 10.7 doesn't provide the full FSEvents API so use kqueue */
+@@ -39,7 +39,7 @@ int uv__fsevents_close(uv_fs_event_t* handle) {
+ void uv__fsevents_loop_delete(uv_loop_t* loop) {
+ }
+ 
+-#else /* TARGET_OS_IPHONE */
++#else /* !HAVE_CORESERVICES_CORESERVICES_H */
+ 
+ #include "darwin-stub.h"
+ 
+@@ -920,4 +920,4 @@ int uv__fsevents_close(uv_fs_event_t* handle) {
+   return 0;
+ }
+ 
+-#endif /* TARGET_OS_IPHONE */
++#endif /* !HAVE_CORESERVICES_CORESERVICES_H */
diff --git a/nixpkgs/pkgs/development/tools/build-managers/cmake/search-path-2.8.patch b/nixpkgs/pkgs/development/tools/build-managers/cmake/search-path-2.8.patch
new file mode 100644
index 000000000000..9fc949661686
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/cmake/search-path-2.8.patch
@@ -0,0 +1,92 @@
+diff -ru3 cmake-2.8.12.2/Modules/Platform/Linux.cmake cmake-2.8.12.2-new/Modules/Platform/Linux.cmake
+--- cmake-2.8.12.2/Modules/Platform/Linux.cmake	2014-01-16 21:15:08.000000000 +0400
++++ cmake-2.8.12.2-new/Modules/Platform/Linux.cmake	2016-04-13 22:00:32.928575740 +0300
+@@ -36,22 +36,11 @@
+   # checking the platform every time.  This option is advanced enough
+   # that only package maintainers should need to adjust it.  They are
+   # capable of providing a setting on the command line.
+-  if(EXISTS "/etc/debian_version")
+-    set(CMAKE_INSTALL_SO_NO_EXE 1 CACHE INTERNAL
+-      "Install .so files without execute permission.")
+-  else()
+-    set(CMAKE_INSTALL_SO_NO_EXE 0 CACHE INTERNAL
+-      "Install .so files without execute permission.")
+-  endif()
++  set(CMAKE_INSTALL_SO_NO_EXE 0 CACHE INTERNAL
++    "Install .so files without execute permission.")
+ endif()
+ 
+ # Match multiarch library directory names.
+ set(CMAKE_LIBRARY_ARCHITECTURE_REGEX "[a-z0-9_]+(-[a-z0-9_]+)?-linux-gnu[a-z0-9_]*")
+ 
+ include(Platform/UnixPaths)
+-
+-# Debian has lib64 paths only for compatibility so they should not be
+-# searched.
+-if(EXISTS "/etc/debian_version")
+-  set_property(GLOBAL PROPERTY FIND_LIBRARY_USE_LIB64_PATHS FALSE)
+-endif()
+diff -ru3 cmake-2.8.12.2/Modules/Platform/UnixPaths.cmake cmake-2.8.12.2-new/Modules/Platform/UnixPaths.cmake
+--- cmake-2.8.12.2/Modules/Platform/UnixPaths.cmake	2014-01-16 21:15:08.000000000 +0400
++++ cmake-2.8.12.2-new/Modules/Platform/UnixPaths.cmake	2016-04-14 00:09:10.106362636 +0300
+@@ -32,9 +32,6 @@
+ # List common installation prefixes.  These will be used for all
+ # search types.
+ list(APPEND CMAKE_SYSTEM_PREFIX_PATH
+-  # Standard
+-  /usr/local /usr /
+-
+   # CMake install location
+   "${_CMAKE_INSTALL_DIR}"
+ 
+@@ -44,44 +41,26 @@
+ 
+ # List common include file locations not under the common prefixes.
+ list(APPEND CMAKE_SYSTEM_INCLUDE_PATH
+-  # Windows API on Cygwin
+-  /usr/include/w32api
+-
+-  # X11
+-  /usr/X11R6/include /usr/include/X11
+-
+-  # Other
+-  /usr/pkg/include
+-  /opt/csw/include /opt/include
+-  /usr/openwin/include
++  @libc_dev@/include
+   )
+ 
+ list(APPEND CMAKE_SYSTEM_LIBRARY_PATH
+-  # Windows API on Cygwin
+-  /usr/lib/w32api
+-
+-  # X11
+-  /usr/X11R6/lib /usr/lib/X11
+-
+-  # Other
+-  /usr/pkg/lib
+-  /opt/csw/lib /opt/lib
+-  /usr/openwin/lib
++  @libc_lib@/lib
+   )
+ 
+ list(APPEND CMAKE_SYSTEM_PROGRAM_PATH
+-  /usr/pkg/bin
++  @libc_bin@/bin
+   )
+ 
+ list(APPEND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES
+-  /lib /usr/lib /usr/lib32 /usr/lib64
++  @libc_lib@/lib
+   )
+ 
+ list(APPEND CMAKE_C_IMPLICIT_INCLUDE_DIRECTORIES
+-  /usr/include
++  @libc_dev@/include
+   )
+ list(APPEND CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES
+-  /usr/include
++  @libc_dev@/include
+   )
+ 
+ # Enable use of lib64 search path variants by default.
diff --git a/nixpkgs/pkgs/development/tools/build-managers/cmake/search-path.patch b/nixpkgs/pkgs/development/tools/build-managers/cmake/search-path.patch
new file mode 100644
index 000000000000..b71c2dd44416
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/cmake/search-path.patch
@@ -0,0 +1,74 @@
+diff --git a/Modules/Platform/UnixPaths.cmake b/Modules/Platform/UnixPaths.cmake
+index b9381c3d7d..cecc40a89e 100644
+--- a/Modules/Platform/UnixPaths.cmake
++++ b/Modules/Platform/UnixPaths.cmake
+@@ -26,9 +26,6 @@ get_filename_component(_CMAKE_INSTALL_DIR "${_CMAKE_INSTALL_DIR}" PATH)
+ # please make sure to keep Help/variable/CMAKE_SYSTEM_PREFIX_PATH.rst
+ # synchronized
+ list(APPEND CMAKE_SYSTEM_PREFIX_PATH
+-  # Standard
+-  /usr/local /usr /
+-
+   # CMake install location
+   "${_CMAKE_INSTALL_DIR}"
+   )
+@@ -47,24 +44,19 @@ endif()
+ 
+ # Non "standard" but common install prefixes
+ list(APPEND CMAKE_SYSTEM_PREFIX_PATH
+-  /usr/X11R6
+-  /usr/pkg
+-  /opt
+   )
+ 
+ # List common include file locations not under the common prefixes.
+ list(APPEND CMAKE_SYSTEM_INCLUDE_PATH
+-  # X11
+-  /usr/include/X11
++  @libc_dev@/include
+   )
+ 
+ list(APPEND CMAKE_SYSTEM_LIBRARY_PATH
+-  # X11
+-  /usr/lib/X11
++  @libc_lib@/lib
+   )
+ 
+ list(APPEND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES
+-  /lib /lib32 /lib64 /usr/lib /usr/lib32 /usr/lib64
++  @libc_lib@/lib
+   )
+ 
+ if(CMAKE_SYSROOT_COMPILE)
+@@ -77,15 +69,15 @@ endif()
+ # parsing the implicit directory information from compiler output.
+ set(_CMAKE_C_IMPLICIT_INCLUDE_DIRECTORIES_INIT
+   ${CMAKE_C_IMPLICIT_INCLUDE_DIRECTORIES}
+-  "${_cmake_sysroot_compile}/usr/include"
++  @libc_dev@/include
+   )
+ set(_CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES_INIT
+   ${CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES}
+-  "${_cmake_sysroot_compile}/usr/include"
++  @libc_dev@/include
+   )
+ set(_CMAKE_CUDA_IMPLICIT_INCLUDE_DIRECTORIES_INIT
+   ${CMAKE_CUDA_IMPLICIT_INCLUDE_DIRECTORIES}
+-  "${_cmake_sysroot_compile}/usr/include"
++  @libc_dev@/include
+   )
+ 
+ unset(_cmake_sysroot_compile)
+diff --git a/Modules/Platform/WindowsPaths.cmake b/Modules/Platform/WindowsPaths.cmake
+index b9e2f17979..ab517cd4a7 100644
+--- a/Modules/Platform/WindowsPaths.cmake
++++ b/Modules/Platform/WindowsPaths.cmake
+@@ -70,7 +70,7 @@ endif()
+ 
+ if(CMAKE_CROSSCOMPILING AND NOT CMAKE_HOST_SYSTEM_NAME MATCHES "Windows")
+   # MinGW (useful when cross compiling from linux with CMAKE_FIND_ROOT_PATH set)
+-  list(APPEND CMAKE_SYSTEM_PREFIX_PATH /)
++  # list(APPEND CMAKE_SYSTEM_PREFIX_PATH /)
+ endif()
+ 
+ list(APPEND CMAKE_SYSTEM_INCLUDE_PATH
diff --git a/nixpkgs/pkgs/development/tools/build-managers/cmake/setup-hook.sh b/nixpkgs/pkgs/development/tools/build-managers/cmake/setup-hook.sh
new file mode 100755
index 000000000000..89e8e0e197a0
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/cmake/setup-hook.sh
@@ -0,0 +1,175 @@
+addCMakeParams() {
+    addToSearchPath CMAKE_PREFIX_PATH $1
+}
+
+fixCmakeFiles() {
+    # Replace occurences of /usr and /opt by /var/empty.
+    echo "fixing cmake files..."
+    find "$1" \( -type f -name "*.cmake" -o -name "*.cmake.in" -o -name CMakeLists.txt \) -print |
+        while read fn; do
+            sed -e 's^/usr\([ /]\|$\)^/var/empty\1^g' -e 's^/opt\([ /]\|$\)^/var/empty\1^g' < "$fn" > "$fn.tmp"
+            mv "$fn.tmp" "$fn"
+        done
+}
+
+cmakeConfigurePhase() {
+    runHook preConfigure
+
+    export CTEST_OUTPUT_ON_FAILURE=1
+    if [ -n "${enableParallelChecking-1}" ]; then
+        export CTEST_PARALLEL_LEVEL=$NIX_BUILD_CORES
+    fi
+
+    if [ -z "${dontFixCmake-}" ]; then
+        fixCmakeFiles .
+    fi
+
+    if [ -z "${dontUseCmakeBuildDir-}" ]; then
+        mkdir -p build
+        cd build
+        cmakeDir=${cmakeDir:-..}
+    fi
+
+    if [ -z "${dontAddPrefix-}" ]; then
+        cmakeFlags="-DCMAKE_INSTALL_PREFIX=$prefix $cmakeFlags"
+    fi
+
+    # We should set the proper `CMAKE_SYSTEM_NAME`.
+    # http://www.cmake.org/Wiki/CMake_Cross_Compiling
+    #
+    # Unfortunately cmake seems to expect absolute paths for ar, ranlib, and
+    # strip. Otherwise they are taken to be relative to the source root of the
+    # package being built.
+    cmakeFlags="-DCMAKE_CXX_COMPILER=$CXX $cmakeFlags"
+    cmakeFlags="-DCMAKE_C_COMPILER=$CC $cmakeFlags"
+    cmakeFlags="-DCMAKE_AR=$(command -v $AR) $cmakeFlags"
+    cmakeFlags="-DCMAKE_RANLIB=$(command -v $RANLIB) $cmakeFlags"
+    cmakeFlags="-DCMAKE_STRIP=$(command -v $STRIP) $cmakeFlags"
+
+    # on macOS we want to prefer Unix-style headers to Frameworks
+    # because we usually do not package the framework
+    cmakeFlags="-DCMAKE_FIND_FRAMEWORK=LAST $cmakeFlags"
+
+    # we never want to use the global macOS SDK
+    cmakeFlags="-DCMAKE_OSX_SYSROOT= $cmakeFlags"
+
+    # correctly detect our clang compiler
+    cmakeFlags="-DCMAKE_POLICY_DEFAULT_CMP0025=NEW $cmakeFlags"
+
+    # This installs shared libraries with a fully-specified install
+    # name. By default, cmake installs shared libraries with just the
+    # basename as the install name, which means that, on Darwin, they
+    # can only be found by an executable at runtime if the shared
+    # libraries are in a system path or in the same directory as the
+    # executable. This flag makes the shared library accessible from its
+    # nix/store directory.
+    cmakeFlags="-DCMAKE_INSTALL_NAME_DIR=${!outputLib}/lib $cmakeFlags"
+
+    # The docdir flag needs to include PROJECT_NAME as per GNU guidelines,
+    # try to extract it from CMakeLists.txt.
+    if [[ -z "$shareDocName" ]]; then
+        local cmakeLists="${cmakeDir}/CMakeLists.txt"
+        if [[ -f "$cmakeLists" ]]; then
+            local shareDocName="$(grep --only-matching --perl-regexp --ignore-case '\bproject\s*\(\s*"?\K([^[:space:]")]+)' < "$cmakeLists" | head -n1)"
+        fi
+        # The argument sometimes contains garbage or variable interpolation.
+        # When that is the case, let’s fall back to the derivation name.
+        if [[ -z "$shareDocName" ]] || echo "$shareDocName" | grep -q '[^a-zA-Z0-9_+-]'; then
+            if [[ -n "${pname-}" ]]; then
+                shareDocName="$pname"
+            else
+                shareDocName="$(echo "$name" | sed 's/-[^a-zA-Z].*//')"
+            fi
+        fi
+    fi
+
+    # This ensures correct paths with multiple output derivations
+    # It requires the project to use variables from GNUInstallDirs module
+    # https://cmake.org/cmake/help/latest/module/GNUInstallDirs.html
+    cmakeFlags="-DCMAKE_INSTALL_BINDIR=${!outputBin}/bin $cmakeFlags"
+    cmakeFlags="-DCMAKE_INSTALL_SBINDIR=${!outputBin}/sbin $cmakeFlags"
+    cmakeFlags="-DCMAKE_INSTALL_INCLUDEDIR=${!outputInclude}/include $cmakeFlags"
+    cmakeFlags="-DCMAKE_INSTALL_OLDINCLUDEDIR=${!outputInclude}/include $cmakeFlags"
+    cmakeFlags="-DCMAKE_INSTALL_MANDIR=${!outputMan}/share/man $cmakeFlags"
+    cmakeFlags="-DCMAKE_INSTALL_INFODIR=${!outputInfo}/share/info $cmakeFlags"
+    cmakeFlags="-DCMAKE_INSTALL_DOCDIR=${!outputDoc}/share/doc/${shareDocName} $cmakeFlags"
+    cmakeFlags="-DCMAKE_INSTALL_LIBDIR=${!outputLib}/lib $cmakeFlags"
+    cmakeFlags="-DCMAKE_INSTALL_LIBEXECDIR=${!outputLib}/libexec $cmakeFlags"
+    cmakeFlags="-DCMAKE_INSTALL_LOCALEDIR=${!outputLib}/share/locale $cmakeFlags"
+
+    # Don’t build tests when doCheck = false
+    if [ -z "${doCheck-}" ]; then
+        cmakeFlags="-DBUILD_TESTING=OFF $cmakeFlags"
+    fi
+
+    # Avoid cmake resetting the rpath of binaries, on make install
+    # And build always Release, to ensure optimisation flags
+    cmakeFlags="-DCMAKE_BUILD_TYPE=${cmakeBuildType:-Release} -DCMAKE_SKIP_BUILD_RPATH=ON $cmakeFlags"
+
+    # Disable user package registry to avoid potential side effects
+    # and unecessary attempts to access non-existent home folder
+    # https://cmake.org/cmake/help/latest/manual/cmake-packages.7.html#disabling-the-package-registry
+    cmakeFlags="-DCMAKE_EXPORT_NO_PACKAGE_REGISTRY=ON $cmakeFlags"
+    cmakeFlags="-DCMAKE_FIND_USE_PACKAGE_REGISTRY=OFF $cmakeFlags"
+    cmakeFlags="-DCMAKE_FIND_USE_SYSTEM_PACKAGE_REGISTRY=OFF $cmakeFlags"
+
+    if [ "${buildPhase-}" = ninjaBuildPhase ]; then
+        cmakeFlags="-GNinja $cmakeFlags"
+    fi
+
+    echo "cmake flags: $cmakeFlags ${cmakeFlagsArray[@]}"
+
+    cmake ${cmakeDir:-.} $cmakeFlags "${cmakeFlagsArray[@]}"
+
+    if ! [[ -v enableParallelBuilding ]]; then
+        enableParallelBuilding=1
+        echo "cmake: enabled parallel building"
+    fi
+
+    runHook postConfigure
+}
+
+if [ -z "${dontUseCmakeConfigure-}" -a -z "${configurePhase-}" ]; then
+    setOutputFlags=
+    configurePhase=cmakeConfigurePhase
+fi
+
+addEnvHooks "$targetOffset" addCMakeParams
+
+makeCmakeFindLibs(){
+  isystem_seen=
+  iframework_seen=
+  for flag in ${NIX_CFLAGS_COMPILE-} ${NIX_LDFLAGS-}; do
+    if test -n "$isystem_seen" && test -d "$flag"; then
+      isystem_seen=
+      export CMAKE_INCLUDE_PATH="${CMAKE_INCLUDE_PATH-}${CMAKE_INCLUDE_PATH:+:}${flag}"
+    elif test -n "$iframework_seen" && test -d "$flag"; then
+      iframework_seen=
+      export CMAKE_FRAMEWORK_PATH="${CMAKE_FRAMEWORK_PATH-}${CMAKE_FRAMEWORK_PATH:+:}${flag}"
+    else
+      isystem_seen=
+      iframework_seen=
+      case $flag in
+        -I*)
+          export CMAKE_INCLUDE_PATH="${CMAKE_INCLUDE_PATH-}${CMAKE_INCLUDE_PATH:+:}${flag:2}"
+          ;;
+        -L*)
+          export CMAKE_LIBRARY_PATH="${CMAKE_LIBRARY_PATH-}${CMAKE_LIBRARY_PATH:+:}${flag:2}"
+          ;;
+        -F*)
+          export CMAKE_FRAMEWORK_PATH="${CMAKE_FRAMEWORK_PATH-}${CMAKE_FRAMEWORK_PATH:+:}${flag:2}"
+          ;;
+        -isystem)
+          isystem_seen=1
+          ;;
+        -iframework)
+          iframework_seen=1
+          ;;
+      esac
+    fi
+  done
+}
+
+# not using setupHook, because it could be a setupHook adding additional
+# include flags to NIX_CFLAGS_COMPILE
+postHooks+=(makeCmakeFindLibs)
diff --git a/nixpkgs/pkgs/development/tools/build-managers/colormake/default.nix b/nixpkgs/pkgs/development/tools/build-managers/colormake/default.nix
new file mode 100644
index 000000000000..251268a449d4
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/colormake/default.nix
@@ -0,0 +1,28 @@
+{ lib, stdenv, fetchFromGitHub, perl }:
+
+stdenv.mkDerivation {
+  pname = "colormake";
+  version = "2.1.0";
+
+  buildInputs = [ perl ];
+
+  src = fetchFromGitHub {
+    owner = "pagekite";
+    repo = "Colormake";
+    rev = "66544f40d";
+    sha256 = "8e714c5540305d169989d9387dbac47b8b9fb2cfb424af7bcd412bfe684dc6d7";
+  };
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp -fa colormake.pl colormake colormake-short clmake clmake-short $out/bin
+  '';
+
+  meta = with lib; {
+    description = "Simple wrapper around make to colorize the output";
+    homepage = "https://bre.klaki.net/programs/colormake/";
+    license = licenses.gpl2;
+    platforms = platforms.unix;
+    maintainers = with maintainers; [ bhipple ];
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/conan/default.nix b/nixpkgs/pkgs/development/tools/build-managers/conan/default.nix
new file mode 100644
index 000000000000..da5e11cce2c8
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/conan/default.nix
@@ -0,0 +1,112 @@
+{ lib, stdenv, python3, fetchFromGitHub, git, pkg-config, fetchpatch }:
+
+# Note:
+# Conan has specific dependency demands; check
+#     https://github.com/conan-io/conan/blob/master/conans/requirements.txt
+#     https://github.com/conan-io/conan/blob/master/conans/requirements_server.txt
+# on the release branch/commit we're packaging.
+#
+# Two approaches are used here to deal with that:
+# Pinning the specific versions it wants in `newPython`,
+# and using `substituteInPlace conans/requirements.txt ...`
+# in `postPatch` to allow newer versions when we know
+# (e.g. from changelogs) that they are compatible.
+
+let newPython = python3.override {
+  packageOverrides = self: super: {
+    distro = super.distro.overridePythonAttrs (oldAttrs: rec {
+      version = "1.1.0";
+      src = oldAttrs.src.override {
+        inherit version;
+        sha256 = "1vn1db2akw98ybnpns92qi11v94hydwp130s8753k6ikby95883j";
+      };
+      patches = oldAttrs.patches or [] ++ [
+        # Don't raise import error on non-linux os. Remove after upgrading to distro≥1.2.0
+        (fetchpatch {
+          url = "https://github.com/nir0s/distro/commit/25aa3f8c5934346dc838387fc081ce81baddeb95.patch";
+          sha256 = "0m09ldf75gacazh2kr04cifgsqfxg670vk4ypl62zv7fp3nyd5dc";
+        })
+      ];
+    });
+    node-semver = super.node-semver.overridePythonAttrs (oldAttrs: rec {
+      version = "0.6.1";
+      src = oldAttrs.src.override {
+        inherit version;
+        sha256 = "1dv6mjsm67l1razcgmq66riqmsb36wns17mnipqr610v0z0zf5j0";
+      };
+    });
+    pluginbase = super.pluginbase.overridePythonAttrs (oldAttrs: rec {
+      version = "0.7";
+      src = oldAttrs.src.override {
+        inherit version;
+        sha256 = "c0abe3218b86533cca287e7057a37481883c07acef7814b70583406938214cc8";
+      };
+    });
+  };
+};
+
+in newPython.pkgs.buildPythonApplication rec {
+  version = "1.27.0";
+  pname = "conan";
+
+  src = fetchFromGitHub {
+    owner = "conan-io";
+    repo = "conan";
+    rev = version;
+    sha256 = "0ncqs1p4g23fmzgdmwppgxr8w275h38hgjdzs456cgivz8xs9rjl";
+  };
+
+  propagatedBuildInputs = with newPython.pkgs; [
+    bottle
+    colorama
+    dateutil
+    deprecation
+    distro
+    fasteners
+    future
+    jinja2
+    node-semver
+    patch-ng
+    pluginbase
+    pygments
+    pyjwt
+    pylint # Not in `requirements.txt` but used in hooks, see https://github.com/conan-io/conan/pull/6152
+    pyyaml
+    requests
+    six
+    tqdm
+    urllib3
+  ] ++ lib.optionals stdenv.isDarwin [ idna cryptography pyopenssl ];
+
+  checkInputs = [
+    pkg-config
+    git
+  ] ++ (with newPython.pkgs; [
+    codecov
+    mock
+    nose
+    parameterized
+    webtest
+  ]);
+
+  # TODO: reenable tests now that we fetch tests w/ the source from GitHub.
+  # Not enabled right now due to time constraints/failing tests that I didn't have time to track down
+  doCheck = false;
+
+  postPatch = ''
+    substituteInPlace conans/requirements.txt \
+      --replace "PyYAML>=3.11, <3.14.0" "PyYAML" \
+      --replace "deprecation>=2.0, <2.1" "deprecation" \
+      --replace "idna==2.6" "idna" \
+      --replace "cryptography>=1.3.4, <2.4.0" "cryptography" \
+      --replace "pyOpenSSL>=16.0.0, <19.0.0" "pyOpenSSL" \
+      --replace "six>=1.10.0,<=1.14.0" "six"
+  '';
+
+  meta = with lib; {
+    homepage = "https://conan.io";
+    description = "Decentralized and portable C/C++ package manager";
+    license = licenses.mit;
+    maintainers = with maintainers; [ HaoZeke ];
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/corrosion/cmake-install-full-dir.patch b/nixpkgs/pkgs/development/tools/build-managers/corrosion/cmake-install-full-dir.patch
new file mode 100644
index 000000000000..da5e923e0fa5
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/corrosion/cmake-install-full-dir.patch
@@ -0,0 +1,18 @@
+diff --git a/cmake/CorrosionConfig.cmake.in b/cmake/CorrosionConfig.cmake.in
+index c042a00..491f53c 100644
+--- a/cmake/CorrosionConfig.cmake.in
++++ b/cmake/CorrosionConfig.cmake.in
+@@ -4,11 +4,11 @@ if (Corrosion_FOUND)
+     return()
+ endif()
+ 
+-list(APPEND CMAKE_MODULE_PATH "${PACKAGE_PREFIX_DIR}/@CORROSION_INSTALL_PREFIX@@CMAKE_INSTALL_DATADIR@/cmake")
++list(APPEND CMAKE_MODULE_PATH "@CMAKE_INSTALL_FULL_DATADIR@/cmake")
+ 
+ add_executable(Corrosion::Generator IMPORTED GLOBAL)
+ set_property(
+     TARGET Corrosion::Generator
+-    PROPERTY IMPORTED_LOCATION "${PACKAGE_PREFIX_DIR}/@CORROSION_INSTALL_PREFIX@@CMAKE_INSTALL_LIBEXECDIR@/corrosion-generator")
++    PROPERTY IMPORTED_LOCATION "@CMAKE_INSTALL_FULL_LIBEXECDIR@/corrosion-generator")
+ 
+ include(Corrosion)
diff --git a/nixpkgs/pkgs/development/tools/build-managers/corrosion/default.nix b/nixpkgs/pkgs/development/tools/build-managers/corrosion/default.nix
new file mode 100644
index 000000000000..2285579b0bbd
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/corrosion/default.nix
@@ -0,0 +1,54 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, cmake
+, rustPlatform
+}:
+
+stdenv.mkDerivation rec {
+  pname = "corrosion";
+  version = "unstable-2021-02-23";
+
+  src = fetchFromGitHub {
+    owner = "AndrewGaspar";
+    repo = "corrosion";
+    rev = "e6c35c7e55a59c8223577b5abc4d253b4a82898b";
+    sha256 = "0vq6g3ggnqiln0q8gsr8rr5rrdgpfcgfly79jwcygxrviw37m44d";
+  };
+
+  patches = [
+    # https://github.com/AndrewGaspar/corrosion/issues/84
+    ./cmake-install-full-dir.patch
+  ];
+
+  cargoRoot = "generator";
+
+  cargoDeps = rustPlatform.fetchCargoTarball {
+    inherit src;
+    sourceRoot = "${src.name}/${cargoRoot}";
+    name = "${pname}-${version}";
+    sha256 = "1fsq8zzzq28fj2fh92wmg8kmdj4y10mcpdmlgxsygy5lbh4xs13f";
+  };
+
+  nativeBuildInputs = [
+    cmake
+  ] ++ (with rustPlatform; [
+    cargoSetupHook
+    rust.cargo
+    rust.rustc
+  ]);
+
+  cmakeFlags = [
+    "-DRust_CARGO=${rustPlatform.rust.cargo}/bin/cargo"
+
+    # tests cannot find cargo because Rust_CARGO is unset before tests
+    "-DCORROSION_BUILD_TESTS=OFF"
+  ];
+
+  meta = with lib; {
+    description = "Tool for integrating Rust into an existing CMake project";
+    homepage = "https://github.com/AndrewGaspar/corrosion";
+    license = licenses.mit;
+    maintainers = with maintainers; [ dotlambda ];
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/drake/Gemfile b/nixpkgs/pkgs/development/tools/build-managers/drake/Gemfile
new file mode 100644
index 000000000000..ddb13a65c165
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/drake/Gemfile
@@ -0,0 +1,2 @@
+source 'https://rubygems.org'
+gem 'drake'
diff --git a/nixpkgs/pkgs/development/tools/build-managers/drake/Gemfile.lock b/nixpkgs/pkgs/development/tools/build-managers/drake/Gemfile.lock
new file mode 100644
index 000000000000..466133010e04
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/drake/Gemfile.lock
@@ -0,0 +1,15 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    comp_tree (1.1.3)
+    drake (0.9.2.0.3.1)
+      comp_tree (>= 1.1.3)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  drake
+
+BUNDLED WITH
+   2.1.4
diff --git a/nixpkgs/pkgs/development/tools/build-managers/drake/default.nix b/nixpkgs/pkgs/development/tools/build-managers/drake/default.nix
new file mode 100644
index 000000000000..2f753c82521e
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/drake/default.nix
@@ -0,0 +1,17 @@
+{ lib, bundlerApp, bundlerUpdateScript }:
+
+bundlerApp {
+  pname = "drake";
+  gemdir = ./.;
+  exes = [ "drake" ];
+
+  passthru.updateScript = bundlerUpdateScript "drake";
+
+  meta = with lib; {
+    description = "A branch of Rake supporting automatic parallelizing of tasks";
+    homepage = "http://quix.github.io/rake/";
+    maintainers = with maintainers; [ romildo manveru nicknovitski ];
+    license = licenses.mit;
+    platforms = platforms.unix;
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/drake/gemset.nix b/nixpkgs/pkgs/development/tools/build-managers/drake/gemset.nix
new file mode 100644
index 000000000000..09b3bc7ec061
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/drake/gemset.nix
@@ -0,0 +1,23 @@
+{
+  comp_tree = {
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "0dj9lkfxcczn67l1j12dcxswrfxxd1zgxa344zk6vqs2gwwhy9m9";
+      type = "gem";
+    };
+    version = "1.1.3";
+  };
+  drake = {
+    dependencies = ["comp_tree"];
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "09gkmdshwdmdnkdxi03dv4rk1dip0wdv6dx14wscrmi0jyk86yag";
+      type = "gem";
+    };
+    version = "0.9.2.0.3.1";
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/dub/default.nix b/nixpkgs/pkgs/development/tools/build-managers/dub/default.nix
new file mode 100644
index 000000000000..fb85c1f33269
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/dub/default.nix
@@ -0,0 +1,155 @@
+{ lib, stdenv, fetchFromGitHub, curl, libevent, rsync, ldc, dcompiler ? ldc }:
+
+assert dcompiler != null;
+
+stdenv.mkDerivation rec {
+  pname = "dub";
+  version = "1.23.0";
+
+  enableParallelBuilding = true;
+
+  src = fetchFromGitHub {
+    owner = "dlang";
+    repo = "dub";
+    rev = "v${version}";
+    sha256 = "06a4whsl1m600k096nwif83n7za3vr7pj1xwapncy5fcad1gmady";
+  };
+
+  postUnpack = ''
+      patchShebangs .
+  '';
+
+  # Can be removed with https://github.com/dlang/dub/pull/1368
+  dubvar = "\\$DUB";
+  postPatch = ''
+      substituteInPlace test/fetchzip.sh \
+          --replace "dub remove" "\"${dubvar}\" remove"
+  '';
+
+  nativeBuildInputs = [ dcompiler libevent rsync ];
+  buildInputs = [ curl ];
+
+  buildPhase = ''
+    for dc_ in dmd ldmd2 gdmd; do
+      echo "... check for D compiler $dc_ ..."
+      dc=$(type -P $dc_ || echo "")
+      if [ ! "$dc" == "" ]; then
+        break
+      fi
+    done
+    if [ "$dc" == "" ]; then
+      exit "Error: could not find D compiler"
+    fi
+    echo "$dc_ found and used as D compiler to build $pname"
+    $dc ./build.d
+    ./build
+  '';
+
+  doCheck = !stdenv.isDarwin;
+
+  checkPhase = ''
+    export DUB=$NIX_BUILD_TOP/source/bin/dub
+    export PATH=$PATH:$NIX_BUILD_TOP/source/bin/
+    export DC=${dcompiler.out}/bin/${dcompiler.pname}
+    echo "DC out --> $DC"
+    export HOME=$TMP
+
+    rm -rf test/issue502-root-import
+    rm test/issue674-concurrent-dub.sh
+    rm test/issue672-upgrade-optional.sh
+    rm test/issue990-download-optional-selected.sh
+    rm test/issue877-auto-fetch-package-on-run.sh
+    rm test/issue1037-better-dependency-messages.sh
+    rm test/issue1416-maven-repo-pkg-supplier.sh
+    rm test/issue1180-local-cache-broken.sh
+    rm test/issue1574-addcommand.sh
+    rm test/issue1524-maven-upgrade-dependency-tree.sh
+    rm test/issue1773-lint.sh
+
+    rm test/ddox.sh
+    rm test/fetchzip.sh
+    rm test/feat663-search.sh
+    rm -rf test/git-dependency
+    rm test/interactive-remove.sh
+    rm test/timeout.sh
+    rm test/version-spec.sh
+    rm test/0-init-multi.sh
+    rm test/0-init-multi-json.sh
+    rm test/4-describe-data-1-list.sh
+    rm test/4-describe-data-3-zero-delim.sh
+    rm test/4-describe-import-paths.sh
+    rm test/4-describe-string-import-paths.sh
+    rm test/4-describe-json.sh
+    rm test/5-convert-stdout.sh
+    rm test/issue1003-check-empty-ld-flags.sh
+    rm test/issue103-single-file-package.sh
+    rm test/issue1040-run-with-ver.sh
+    rm test/issue1091-bogus-rebuild.sh
+    rm test/issue1194-warn-wrong-subconfig.sh
+    rm test/issue1277.sh
+    rm test/issue1372-ignore-files-in-hidden-dirs.sh
+    rm test/issue1447-build-settings-vars.sh
+    rm test/issue1531-toolchain-requirements.sh
+    rm test/issue346-redundant-flags.sh
+    rm test/issue361-optional-deps.sh
+    rm test/issue564-invalid-upgrade-dependency.sh
+    rm test/issue586-subpack-dep.sh
+    rm test/issue616-describe-vs-generate-commands.sh
+    rm test/issue686-multiple-march.sh
+    rm test/issue813-fixed-dependency.sh
+    rm test/issue813-pure-sub-dependency.sh
+    rm test/issue820-extra-fields-after-convert.sh
+    rm test/issue923-subpackage-deps.sh
+    rm test/single-file-sdl-default-name.sh
+    rm test/subpackage-common-with-sourcefile-globbing.sh
+    rm test/issue934-path-dep.sh
+    rm -r test/1-dynLib-simple
+    rm -r test/1-exec-simple-package-json
+    rm -r test/1-exec-simple
+    rm -r test/1-staticLib-simple
+    rm -r test/2-dynLib-dep
+    rm -r test/2-staticLib-dep
+    rm -r test/2-dynLib-with-staticLib-dep
+    rm -r test/2-sourceLib-dep/
+    rm -r test/3-copyFiles
+    rm -r test/custom-source-main-bug487
+    rm -r test/custom-unittest
+    rm -r test/issue1262-version-inheritance-diamond
+    rm -r test/issue1003-check-empty-ld-flags
+    rm -r test/ignore-hidden-1
+    rm -r test/ignore-hidden-2
+    rm -r test/issue1427-betterC
+    rm -r test/issue130-unicode-*
+    rm -r test/issue1262-version-inheritance
+    rm -r test/issue1372-ignore-files-in-hidden-dirs
+    rm -r test/issue1350-transitive-none-deps
+    rm -r test/issue1775
+    rm -r test/issue1447-build-settings-vars
+    rm -r test/issue1408-inherit-linker-files
+    rm -r test/issue1551-var-escaping
+    rm -r test/issue754-path-selection-fail
+    rm -r test/issue1788-incomplete-string-import-override
+    rm -r test/subpackage-ref
+    rm -r test/issue777-bogus-path-dependency
+    rm -r test/issue959-path-based-subpack-dep
+    rm -r test/issue97-targettype-none-nodeps
+    rm -r test/issue97-targettype-none-onerecipe
+    rm -r test/path-subpackage-ref
+    rm -r test/sdl-package-simple
+
+    ./test/run-unittest.sh
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp bin/dub $out/bin
+  '';
+
+  meta = with lib; {
+    description = "Package and build manager for D applications and libraries";
+    homepage = "https://code.dlang.org/";
+    license = licenses.mit;
+    maintainers = with maintainers; [ ThomasMader ];
+    platforms = [ "x86_64-linux" "i686-linux" "x86_64-darwin" ];
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/fac/cargo-lock.patch b/nixpkgs/pkgs/development/tools/build-managers/fac/cargo-lock.patch
new file mode 100644
index 000000000000..86768d4611e3
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/fac/cargo-lock.patch
@@ -0,0 +1,802 @@
+diff --git a/Cargo.lock b/Cargo.lock
+new file mode 100644
+index 0000000..4ab2c17
+--- /dev/null
++++ b/Cargo.lock
+@@ -0,0 +1,796 @@
++# This file is automatically @generated by Cargo.
++# It is not intended for manual editing.
++[[package]]
++name = "ahash"
++version = "0.3.8"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "e8fd72866655d1904d6b0997d0b07ba561047d070fbe29de039031c641b61217"
++
++[[package]]
++name = "aho-corasick"
++version = "0.7.13"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "043164d8ba5c4c3035fec9bbee8647c0261d788f3474306f93bb65901cae0e86"
++dependencies = [
++ "memchr",
++]
++
++[[package]]
++name = "ansi_term"
++version = "0.11.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "ee49baf6cb617b853aa8d93bf420db2383fab46d314482ca2803b40d5fde979b"
++dependencies = [
++ "winapi 0.3.9",
++]
++
++[[package]]
++name = "atty"
++version = "0.2.14"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
++dependencies = [
++ "hermit-abi",
++ "libc",
++ "winapi 0.3.9",
++]
++
++[[package]]
++name = "autocfg"
++version = "1.0.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
++
++[[package]]
++name = "bigbro"
++version = "0.5.2"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "3eaac07a3e62cd31e2102ca97c7fdf20002893ba2a396d29ea4710d2415cdce5"
++dependencies = [
++ "libc",
++ "seccomp-droundy",
++]
++
++[[package]]
++name = "bitflags"
++version = "1.2.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
++
++[[package]]
++name = "cc"
++version = "1.0.59"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "66120af515773fb005778dc07c261bd201ec8ce50bd6e7144c927753fe013381"
++
++[[package]]
++name = "cfg-if"
++version = "0.1.10"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
++
++[[package]]
++name = "clap"
++version = "2.33.3"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "37e58ac78573c40708d45522f0d80fa2f01cc4f9b4e2bf749807255454312002"
++dependencies = [
++ "ansi_term",
++ "atty",
++ "bitflags",
++ "strsim",
++ "textwrap",
++ "unicode-width",
++ "vec_map",
++]
++
++[[package]]
++name = "crude-profiler"
++version = "0.1.7"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "9389510ac716b6ace8c4b635420cf023e12c81b61e933bfef06639142f149ecd"
++dependencies = [
++ "lazy_static 0.2.11",
++]
++
++[[package]]
++name = "ctrlc"
++version = "3.1.6"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "d0b676fa23f995faf587496dcd1c80fead847ed58d2da52ac1caca9a72790dd2"
++dependencies = [
++ "nix",
++ "winapi 0.3.9",
++]
++
++[[package]]
++name = "either"
++version = "1.6.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "cd56b59865bce947ac5958779cfa508f6c3b9497cc762b7e24a12d11ccde2c4f"
++
++[[package]]
++name = "env_logger"
++version = "0.7.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "44533bbbb3bb3c1fa17d9f2e4e38bbbaf8396ba82193c4cb1b6445d711445d36"
++dependencies = [
++ "log",
++ "regex",
++]
++
++[[package]]
++name = "fac"
++version = "0.5.3"
++dependencies = [
++ "atty",
++ "bigbro",
++ "clap",
++ "crude-profiler",
++ "ctrlc",
++ "git-version",
++ "internment",
++ "lazy_static 1.4.0",
++ "libc",
++ "metrohash",
++ "notify",
++ "num_cpus",
++ "pathdiff",
++ "quickcheck",
++ "termcolor",
++ "tinyset",
++]
++
++[[package]]
++name = "filetime"
++version = "0.2.12"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "3ed85775dcc68644b5c950ac06a2b23768d3bc9390464151aaf27136998dcf9e"
++dependencies = [
++ "cfg-if",
++ "libc",
++ "redox_syscall",
++ "winapi 0.3.9",
++]
++
++[[package]]
++name = "fsevent"
++version = "0.4.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "5ab7d1bd1bd33cc98b0889831b72da23c0aa4df9cec7e0702f46ecea04b35db6"
++dependencies = [
++ "bitflags",
++ "fsevent-sys",
++]
++
++[[package]]
++name = "fsevent-sys"
++version = "2.0.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "f41b048a94555da0f42f1d632e2e19510084fb8e303b0daa2816e733fb3644a0"
++dependencies = [
++ "libc",
++]
++
++[[package]]
++name = "fuchsia-zircon"
++version = "0.3.3"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "2e9763c69ebaae630ba35f74888db465e49e259ba1bc0eda7d06f4a067615d82"
++dependencies = [
++ "bitflags",
++ "fuchsia-zircon-sys",
++]
++
++[[package]]
++name = "fuchsia-zircon-sys"
++version = "0.3.3"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "3dcaa9ae7725d12cdb85b3ad99a434db70b468c09ded17e012d86b5c1010f7a7"
++
++[[package]]
++name = "gcc"
++version = "0.3.55"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "8f5f3913fa0bfe7ee1fd8248b6b9f42a5af4b9d65ec2dd2c3c26132b950ecfc2"
++
++[[package]]
++name = "getrandom"
++version = "0.1.15"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "fc587bc0ec293155d5bfa6b9891ec18a1e330c234f896ea47fbada4cadbe47e6"
++dependencies = [
++ "cfg-if",
++ "libc",
++ "wasi",
++]
++
++[[package]]
++name = "git-version"
++version = "0.3.4"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "94918e83f1e01dedc2e361d00ce9487b14c58c7f40bab148026fa39d42cb41e2"
++dependencies = [
++ "git-version-macro",
++ "proc-macro-hack",
++]
++
++[[package]]
++name = "git-version-macro"
++version = "0.3.4"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "34a97a52fdee1870a34fa6e4b77570cba531b27d1838874fef4429a791a3d657"
++dependencies = [
++ "proc-macro-hack",
++ "proc-macro2",
++ "quote",
++ "syn",
++]
++
++[[package]]
++name = "hashbrown"
++version = "0.8.2"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "e91b62f79061a0bc2e046024cb7ba44b08419ed238ecbd9adbd787434b9e8c25"
++dependencies = [
++ "ahash",
++ "autocfg",
++]
++
++[[package]]
++name = "hermit-abi"
++version = "0.1.15"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "3deed196b6e7f9e44a2ae8d94225d80302d81208b1bb673fd21fe634645c85a9"
++dependencies = [
++ "libc",
++]
++
++[[package]]
++name = "inotify"
++version = "0.7.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "4816c66d2c8ae673df83366c18341538f234a26d65a9ecea5c348b453ac1d02f"
++dependencies = [
++ "bitflags",
++ "inotify-sys",
++ "libc",
++]
++
++[[package]]
++name = "inotify-sys"
++version = "0.1.3"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "e74a1aa87c59aeff6ef2cc2fa62d41bc43f54952f55652656b18a02fd5e356c0"
++dependencies = [
++ "libc",
++]
++
++[[package]]
++name = "internment"
++version = "0.3.13"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "7e5cba670f596a69e619cb796bcf609cb32c0ba4415d1e809104b8b832130d79"
++dependencies = [
++ "hashbrown",
++ "lazy_static 1.4.0",
++ "serde",
++ "state",
++ "tinyset",
++]
++
++[[package]]
++name = "iovec"
++version = "0.1.4"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "b2b3ea6ff95e175473f8ffe6a7eb7c00d054240321b84c57051175fe3c1e075e"
++dependencies = [
++ "libc",
++]
++
++[[package]]
++name = "itertools"
++version = "0.9.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "284f18f85651fe11e8a991b2adb42cb078325c996ed026d994719efcfca1d54b"
++dependencies = [
++ "either",
++]
++
++[[package]]
++name = "kernel32-sys"
++version = "0.2.2"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
++dependencies = [
++ "winapi 0.2.8",
++ "winapi-build",
++]
++
++[[package]]
++name = "lazy_static"
++version = "0.2.11"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "76f033c7ad61445c5b347c7382dd1237847eb1bce590fe50365dcb33d546be73"
++
++[[package]]
++name = "lazy_static"
++version = "1.4.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
++
++[[package]]
++name = "lazycell"
++version = "1.3.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "830d08ce1d1d941e6b30645f1a0eb5643013d835ce3779a5fc208261dbe10f55"
++
++[[package]]
++name = "libc"
++version = "0.2.77"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "f2f96b10ec2560088a8e76961b00d47107b3a625fecb76dedb29ee7ccbf98235"
++
++[[package]]
++name = "log"
++version = "0.4.11"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "4fabed175da42fed1fa0746b0ea71f412aa9d35e76e95e59b192c64b9dc2bf8b"
++dependencies = [
++ "cfg-if",
++]
++
++[[package]]
++name = "memchr"
++version = "2.3.3"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "3728d817d99e5ac407411fa471ff9800a778d88a24685968b36824eaf4bee400"
++
++[[package]]
++name = "metrohash"
++version = "1.0.6"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "3ba553cb19e2acbc54baa16faef215126243fe45e53357a3b2e9f4ebc7b0506c"
++
++[[package]]
++name = "mio"
++version = "0.6.22"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "fce347092656428bc8eaf6201042cb551b8d67855af7374542a92a0fbfcac430"
++dependencies = [
++ "cfg-if",
++ "fuchsia-zircon",
++ "fuchsia-zircon-sys",
++ "iovec",
++ "kernel32-sys",
++ "libc",
++ "log",
++ "miow",
++ "net2",
++ "slab",
++ "winapi 0.2.8",
++]
++
++[[package]]
++name = "mio-extras"
++version = "2.0.6"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "52403fe290012ce777c4626790c8951324a2b9e3316b3143779c72b029742f19"
++dependencies = [
++ "lazycell",
++ "log",
++ "mio",
++ "slab",
++]
++
++[[package]]
++name = "miow"
++version = "0.2.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "8c1f2f3b1cf331de6896aabf6e9d55dca90356cc9960cca7eaaf408a355ae919"
++dependencies = [
++ "kernel32-sys",
++ "net2",
++ "winapi 0.2.8",
++ "ws2_32-sys",
++]
++
++[[package]]
++name = "net2"
++version = "0.2.35"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "3ebc3ec692ed7c9a255596c67808dee269f64655d8baf7b4f0638e51ba1d6853"
++dependencies = [
++ "cfg-if",
++ "libc",
++ "winapi 0.3.9",
++]
++
++[[package]]
++name = "nix"
++version = "0.17.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "50e4785f2c3b7589a0d0c1dd60285e1188adac4006e8abd6dd578e1567027363"
++dependencies = [
++ "bitflags",
++ "cc",
++ "cfg-if",
++ "libc",
++ "void",
++]
++
++[[package]]
++name = "notify"
++version = "4.0.15"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "80ae4a7688d1fab81c5bf19c64fc8db920be8d519ce6336ed4e7efe024724dbd"
++dependencies = [
++ "bitflags",
++ "filetime",
++ "fsevent",
++ "fsevent-sys",
++ "inotify",
++ "libc",
++ "mio",
++ "mio-extras",
++ "walkdir",
++ "winapi 0.3.9",
++]
++
++[[package]]
++name = "num_cpus"
++version = "1.13.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "05499f3756671c15885fee9034446956fff3f243d6077b91e5767df161f766b3"
++dependencies = [
++ "hermit-abi",
++ "libc",
++]
++
++[[package]]
++name = "pathdiff"
++version = "0.2.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "877630b3de15c0b64cc52f659345724fbf6bdad9bd9566699fc53688f3c34a34"
++
++[[package]]
++name = "pkg-config"
++version = "0.3.18"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "d36492546b6af1463394d46f0c834346f31548646f6ba10849802c9c9a27ac33"
++
++[[package]]
++name = "ppv-lite86"
++version = "0.2.9"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "c36fa947111f5c62a733b652544dd0016a43ce89619538a8ef92724a6f501a20"
++
++[[package]]
++name = "proc-macro-hack"
++version = "0.5.18"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "99c605b9a0adc77b7211c6b1f722dcb613d68d66859a44f3d485a6da332b0598"
++
++[[package]]
++name = "proc-macro2"
++version = "1.0.21"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "36e28516df94f3dd551a587da5357459d9b36d945a7c37c3557928c1c2ff2a2c"
++dependencies = [
++ "unicode-xid",
++]
++
++[[package]]
++name = "quickcheck"
++version = "0.9.2"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "a44883e74aa97ad63db83c4bf8ca490f02b2fc02f92575e720c8551e843c945f"
++dependencies = [
++ "env_logger",
++ "log",
++ "rand",
++ "rand_core",
++]
++
++[[package]]
++name = "quote"
++version = "1.0.7"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
++dependencies = [
++ "proc-macro2",
++]
++
++[[package]]
++name = "rand"
++version = "0.7.3"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
++dependencies = [
++ "getrandom",
++ "libc",
++ "rand_chacha",
++ "rand_core",
++ "rand_hc",
++]
++
++[[package]]
++name = "rand_chacha"
++version = "0.2.2"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
++dependencies = [
++ "ppv-lite86",
++ "rand_core",
++]
++
++[[package]]
++name = "rand_core"
++version = "0.5.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
++dependencies = [
++ "getrandom",
++]
++
++[[package]]
++name = "rand_hc"
++version = "0.2.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
++dependencies = [
++ "rand_core",
++]
++
++[[package]]
++name = "redox_syscall"
++version = "0.1.57"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "41cc0f7e4d5d4544e8861606a285bb08d3e70712ccc7d2b84d7c0ccfaf4b05ce"
++
++[[package]]
++name = "regex"
++version = "1.3.9"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "9c3780fcf44b193bc4d09f36d2a3c87b251da4a046c87795a0d35f4f927ad8e6"
++dependencies = [
++ "aho-corasick",
++ "memchr",
++ "regex-syntax",
++ "thread_local 1.0.1",
++]
++
++[[package]]
++name = "regex-syntax"
++version = "0.6.18"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "26412eb97c6b088a6997e05f69403a802a92d520de2f8e63c2b65f9e0f47c4e8"
++
++[[package]]
++name = "same-file"
++version = "1.0.6"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "93fc1dc3aaa9bfed95e02e6eadabb4baf7e3078b0bd1b4d7b6b0b68378900502"
++dependencies = [
++ "winapi-util",
++]
++
++[[package]]
++name = "seccomp-droundy"
++version = "0.1.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "d4b762ab71c6bf1a9a3e0b21e8600b73b088f2a6562e03cd77b2826821fae5f8"
++dependencies = [
++ "libc",
++ "seccomp-droundy-sys",
++]
++
++[[package]]
++name = "seccomp-droundy-sys"
++version = "0.1.2"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "200976cc4ff22cd8b9c6c23681fe6aa89a12aa3637c86dd16e44c05d7c373488"
++dependencies = [
++ "gcc",
++ "libc",
++ "pkg-config",
++]
++
++[[package]]
++name = "serde"
++version = "1.0.115"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "e54c9a88f2da7238af84b5101443f0c0d0a3bbdc455e34a5c9497b1903ed55d5"
++
++[[package]]
++name = "slab"
++version = "0.4.2"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "c111b5bd5695e56cffe5129854aa230b39c93a305372fdbb2668ca2394eea9f8"
++
++[[package]]
++name = "state"
++version = "0.4.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "7345c971d1ef21ffdbd103a75990a15eb03604fc8b8852ca8cb418ee1a099028"
++dependencies = [
++ "thread_local 0.3.3",
++]
++
++[[package]]
++name = "strsim"
++version = "0.8.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
++
++[[package]]
++name = "syn"
++version = "1.0.40"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "963f7d3cc59b59b9325165add223142bbf1df27655d07789f109896d353d8350"
++dependencies = [
++ "proc-macro2",
++ "quote",
++ "unicode-xid",
++]
++
++[[package]]
++name = "termcolor"
++version = "1.1.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "bb6bfa289a4d7c5766392812c0a1f4c1ba45afa1ad47803c11e1f407d846d75f"
++dependencies = [
++ "winapi-util",
++]
++
++[[package]]
++name = "textwrap"
++version = "0.11.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060"
++dependencies = [
++ "unicode-width",
++]
++
++[[package]]
++name = "thread-id"
++version = "3.3.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "c7fbf4c9d56b320106cd64fd024dadfa0be7cb4706725fc44a7d7ce952d820c1"
++dependencies = [
++ "libc",
++ "redox_syscall",
++ "winapi 0.3.9",
++]
++
++[[package]]
++name = "thread_local"
++version = "0.3.3"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "c85048c6260d17cf486ceae3282d9fb6b90be220bf5b28c400f5485ffc29f0c7"
++dependencies = [
++ "thread-id",
++ "unreachable",
++]
++
++[[package]]
++name = "thread_local"
++version = "1.0.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "d40c6d1b69745a6ec6fb1ca717914848da4b44ae29d9b3080cbee91d72a69b14"
++dependencies = [
++ "lazy_static 1.4.0",
++]
++
++[[package]]
++name = "tinyset"
++version = "0.4.4"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "784f540960a63144d63992caf430ed87e39d920f2c474cb8ac586ff31fb861fc"
++dependencies = [
++ "itertools",
++ "rand",
++]
++
++[[package]]
++name = "unicode-width"
++version = "0.1.8"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "9337591893a19b88d8d87f2cec1e73fad5cdfd10e5a6f349f498ad6ea2ffb1e3"
++
++[[package]]
++name = "unicode-xid"
++version = "0.2.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
++
++[[package]]
++name = "unreachable"
++version = "0.1.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "1f2ae5ddb18e1c92664717616dd9549dde73f539f01bd7b77c2edb2446bdff91"
++dependencies = [
++ "void",
++]
++
++[[package]]
++name = "vec_map"
++version = "0.8.2"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
++
++[[package]]
++name = "void"
++version = "1.0.2"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
++
++[[package]]
++name = "walkdir"
++version = "2.3.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "777182bc735b6424e1a57516d35ed72cb8019d85c8c9bf536dccb3445c1a2f7d"
++dependencies = [
++ "same-file",
++ "winapi 0.3.9",
++ "winapi-util",
++]
++
++[[package]]
++name = "wasi"
++version = "0.9.0+wasi-snapshot-preview1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
++
++[[package]]
++name = "winapi"
++version = "0.2.8"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
++
++[[package]]
++name = "winapi"
++version = "0.3.9"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
++dependencies = [
++ "winapi-i686-pc-windows-gnu",
++ "winapi-x86_64-pc-windows-gnu",
++]
++
++[[package]]
++name = "winapi-build"
++version = "0.1.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
++
++[[package]]
++name = "winapi-i686-pc-windows-gnu"
++version = "0.4.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
++
++[[package]]
++name = "winapi-util"
++version = "0.1.5"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
++dependencies = [
++ "winapi 0.3.9",
++]
++
++[[package]]
++name = "winapi-x86_64-pc-windows-gnu"
++version = "0.4.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
++
++[[package]]
++name = "ws2_32-sys"
++version = "0.2.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
++dependencies = [
++ "winapi 0.2.8",
++ "winapi-build",
++]
diff --git a/nixpkgs/pkgs/development/tools/build-managers/fac/default.nix b/nixpkgs/pkgs/development/tools/build-managers/fac/default.nix
new file mode 100644
index 000000000000..601f7ea9fea0
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/fac/default.nix
@@ -0,0 +1,50 @@
+{ lib, git, fetchFromGitHub, rustPlatform }:
+
+rustPlatform.buildRustPackage rec {
+  pname = "fac-build";
+  version = "0.5.3";
+
+  src = fetchFromGitHub {
+    owner = "droundy";
+    repo = "fac";
+    rev = version;
+    sha256 = "1gifrlb31jy8633rnhny58ccp3wlmd338129c6sh0h1a38vkmsxk";
+  };
+
+  # workaround for missing Cargo.lock file
+  cargoPatches = [ ./cargo-lock.patch ];
+
+  cargoSha256 = "0hjfq61y1ikdcajr2k514k7fad2zxbwq7yb5nk1wx38f1524709q";
+
+  # fac includes a unit test called ls_files_works which assumes it's
+  # running in a git repo. Nix's sandbox runs cargo build outside git,
+  # so this test won't work.
+  checkFlagsArray = [ "--skip=ls_files_works" ];
+
+  # fac calls git at runtime, expecting it to be in the PATH,
+  # so we need to patch it to call git by absolute path instead.
+  postPatch = ''
+    substituteInPlace src/git.rs \
+        --replace 'std::process::Command::new("git")' \
+        'std::process::Command::new("${git}/bin/git")'
+  '';
+
+  meta = with lib; {
+    description = ''
+      A build system that uses ptrace to handle dependencies automatically
+    '';
+    longDescription = ''
+      Fac is a general-purpose build system inspired by make that utilizes
+      ptrace to ensure that all dependences are enumerated and that all
+      source files are added to a (git) repo. An important feature of fac
+      is that it automatically handles dependencies, rather than either
+      complaining about them or giving an incorrect build. Currently, fac
+      only runs on linux systems, but on those systems it is incredibly
+      easy to use!
+    '';
+    homepage = "https://physics.oregonstate.edu/~roundyd/fac";
+    license = licenses.gpl2Plus;
+    platforms = platforms.linux;
+    maintainers = [ maintainers.dpercy ];
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/gn/default.nix b/nixpkgs/pkgs/development/tools/build-managers/gn/default.nix
new file mode 100644
index 000000000000..3c0abb3edeab
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/gn/default.nix
@@ -0,0 +1,64 @@
+{ stdenv, lib, fetchgit, darwin, writeText
+, ninja, python3
+}:
+
+let
+  # Note: Please use the recommended version for Chromium, e.g.:
+  # https://git.archlinux.org/svntogit/packages.git/tree/trunk/chromium-gn-version.sh?h=packages/gn
+  rev = "fd3d768bcfd44a8d9639fe278581bd9851d0ce3a";
+  revNum = "1718"; # git describe HEAD --match initial-commit | cut -d- -f3
+  version = "2020-03-09";
+  sha256 = "1asc14y8by7qcn10vbk467hvx93s30pif8r0brissl0sihsaqazr";
+
+  revShort = builtins.substring 0 7 rev;
+  lastCommitPosition = writeText "last_commit_position.h" ''
+    #ifndef OUT_LAST_COMMIT_POSITION_H_
+    #define OUT_LAST_COMMIT_POSITION_H_
+
+    #define LAST_COMMIT_POSITION_NUM ${revNum}
+    #define LAST_COMMIT_POSITION "${revNum} (${revShort})"
+
+    #endif  // OUT_LAST_COMMIT_POSITION_H_
+  '';
+
+in stdenv.mkDerivation {
+  pname = "gn-unstable";
+  inherit version;
+
+  src = fetchgit {
+    # Note: The TAR-Archives (+archive/${rev}.tar.gz) are not deterministic!
+    url = "https://gn.googlesource.com/gn";
+    inherit rev sha256;
+  };
+
+  nativeBuildInputs = [ ninja python3 ];
+  buildInputs = lib.optionals stdenv.isDarwin (with darwin; with apple_sdk.frameworks; [
+    libobjc
+    cctools
+
+    # frameworks
+    ApplicationServices
+    Foundation
+    AppKit
+  ]);
+
+  buildPhase = ''
+    python build/gen.py --no-last-commit-position
+    ln -s ${lastCommitPosition} out/last_commit_position.h
+    ninja -j $NIX_BUILD_CORES -C out gn
+  '';
+
+  installPhase = ''
+    install -vD out/gn "$out/bin/gn"
+  '';
+
+  setupHook = ./setup-hook.sh;
+
+  meta = with lib; {
+    description = "A meta-build system that generates build files for Ninja";
+    homepage = "https://gn.googlesource.com/gn";
+    license = licenses.bsd3;
+    platforms = platforms.unix;
+    maintainers = with maintainers; [ stesie matthewbauer primeos ];
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/gn/setup-hook.sh b/nixpkgs/pkgs/development/tools/build-managers/gn/setup-hook.sh
new file mode 100644
index 000000000000..850f18948cad
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/gn/setup-hook.sh
@@ -0,0 +1,14 @@
+gnConfigurePhase() {
+    runHook preConfigure
+
+    echo "gn flags: $gnFlags ${gnFlagsArray[@]}"
+
+    gn gen out/Release --args="$gnFlags ${gnFlagsArray[@]}"
+    cd out/Release/
+
+    runHook postConfigure
+}
+
+if [ -z "${dontUseGnConfigure-}" -a -z "${configurePhase-}" ]; then
+    configurePhase=gnConfigurePhase
+fi
diff --git a/nixpkgs/pkgs/development/tools/build-managers/gnumake/4.2/default.nix b/nixpkgs/pkgs/development/tools/build-managers/gnumake/4.2/default.nix
new file mode 100644
index 000000000000..387650e85ab7
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/gnumake/4.2/default.nix
@@ -0,0 +1,63 @@
+{ lib, stdenv, fetchurl, guileSupport ? false, pkg-config ? null , guile ? null }:
+
+assert guileSupport -> ( pkg-config != null && guile != null );
+
+let
+  version = "4.2.1";
+in
+stdenv.mkDerivation {
+  pname = "gnumake";
+  inherit version;
+
+  src = fetchurl {
+    url = "mirror://gnu/make/make-${version}.tar.bz2";
+    sha256 = "12f5zzyq2w56g95nni65hc0g5p7154033y2f3qmjvd016szn5qnn";
+  };
+
+  patchFlags = [ "-p0" ];
+  patches = [
+    # Purity: don't look for library dependencies (of the form `-lfoo') in /lib
+    # and /usr/lib. It's a stupid feature anyway. Likewise, when searching for
+    # included Makefiles, don't look in /usr/include and friends.
+    ./impure-dirs.patch
+    ./pselect.patch
+    # Fix support for glibc 2.27's glob, inspired by http://www.linuxfromscratch.org/lfs/view/8.2/chapter05/make.html
+    ./glibc-2.27-glob.patch
+  ];
+
+  nativeBuildInputs = lib.optionals guileSupport [ pkg-config ];
+  buildInputs = lib.optionals guileSupport [ guile ];
+
+  configureFlags = lib.optional guileSupport "--with-guile"
+
+    # Make uses this test to decide whether it should keep track of
+    # subseconds. Apple made this possible with APFS and macOS 10.13.
+    # However, we still support macOS 10.11 and 10.12. Binaries built
+    # in Nixpkgs will be unable to use futimens to set mtime less than
+    # a second. So, tell Make to ignore nanoseconds in mtime here by
+    # overriding the autoconf test for the struct.
+    # See https://github.com/NixOS/nixpkgs/issues/51221 for discussion.
+    ++ lib.optional stdenv.isDarwin "ac_cv_struct_st_mtim_nsec=no";
+
+  outputs = [ "out" "man" "info" ];
+
+  meta = with lib; {
+    homepage = "https://www.gnu.org/software/make/";
+    description = "A tool to control the generation of non-source files from sources";
+    license = licenses.gpl3Plus;
+
+    longDescription = ''
+      Make is a tool which controls the generation of executables and
+      other non-source files of a program from the program's source files.
+
+      Make gets its knowledge of how to build your program from a file
+      called the makefile, which lists each of the non-source files and
+      how to compute it from other files. When you write a program, you
+      should write a makefile for it, so that it is possible to use Make
+      to build and install the program.
+    '';
+
+    platforms = platforms.all;
+    maintainers = [ maintainers.vrthra ];
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/gnumake/4.2/glibc-2.27-glob.patch b/nixpkgs/pkgs/development/tools/build-managers/gnumake/4.2/glibc-2.27-glob.patch
new file mode 100644
index 000000000000..186212d0d298
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/gnumake/4.2/glibc-2.27-glob.patch
@@ -0,0 +1,32 @@
+diff -Naur glob/glob.c glob/glob.c
+--- glob/glob.c	2013-10-20 13:14:38.000000000 -0400
++++ glob/glob.c	2018-03-16 14:32:38.483496170 -0400
+@@ -208,28 +208,9 @@
+ #endif /* __GNU_LIBRARY__ || __DJGPP__ */
+ 
+ 
+-#if !defined __alloca && !defined __GNU_LIBRARY__
+-
+-# ifdef	__GNUC__
+-#  undef alloca
+-#  define alloca(n)	__builtin_alloca (n)
+-# else	/* Not GCC.  */
+-#  ifdef HAVE_ALLOCA_H
+ #   include <alloca.h>
+-#  else	/* Not HAVE_ALLOCA_H.  */
+-#   ifndef _AIX
+-#    ifdef WINDOWS32
+-#     include <malloc.h>
+-#    else
+-extern char *alloca ();
+-#    endif /* WINDOWS32 */
+-#   endif /* Not _AIX.  */
+-#  endif /* sparc or HAVE_ALLOCA_H.  */
+-# endif	/* GCC.  */
+-
+ # define __alloca	alloca
+ 
+-#endif
+ 
+ #ifndef __GNU_LIBRARY__
+ # define __stat stat
diff --git a/nixpkgs/pkgs/development/tools/build-managers/gnumake/4.2/impure-dirs.patch b/nixpkgs/pkgs/development/tools/build-managers/gnumake/4.2/impure-dirs.patch
new file mode 100644
index 000000000000..f6646f1d0126
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/gnumake/4.2/impure-dirs.patch
@@ -0,0 +1,34 @@
+diff -rc read.c read.c
+*** read.c	2006-03-17 15:24:20.000000000 +0100
+--- read.c	2007-05-24 17:16:31.000000000 +0200
+***************
+*** 99,107 ****
+--- 99,109 ----
+  #endif
+      INCLUDEDIR,
+  #ifndef _AMIGA
++ #if 0    
+      "/usr/gnu/include",
+      "/usr/local/include",
+      "/usr/include",
++ #endif    
+  #endif
+      0
+    };
+diff -rc reremake.c
+*** remake.c	2006-03-20 03:36:37.000000000 +0100
+--- remake.c	2007-05-24 17:06:54.000000000 +0200
+***************
+*** 1452,1460 ****
+--- 1452,1462 ----
+    static char *dirs[] =
+      {
+  #ifndef _AMIGA
++ #if 0
+        "/lib",
+        "/usr/lib",
+  #endif
++ #endif
+  #if defined(WINDOWS32) && !defined(LIBDIR)
+  /*
+   * This is completely up to the user at product install time. Just define
diff --git a/nixpkgs/pkgs/development/tools/build-managers/gnumake/4.2/pselect.patch b/nixpkgs/pkgs/development/tools/build-managers/gnumake/4.2/pselect.patch
new file mode 100644
index 000000000000..5a03acb2f7ca
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/gnumake/4.2/pselect.patch
@@ -0,0 +1,170 @@
+From b552b05251980f693c729e251f93f5225b400714 Mon Sep 17 00:00:00 2001
+From: Paul Smith <psmith@gnu.org>
+Date: Sat, 3 Jun 2017 16:20:51 -0400
+Subject: [SV 51159] Use a non-blocking read with pselect to avoid hangs.
+
+* posixos.c (set_blocking): Set blocking on a file descriptor.
+(jobserver_setup): Set non-blocking on the jobserver read side.
+(jobserver_parse_auth): Ditto.
+(jobserver_acquire_all): Set blocking to avoid a busy-wait loop.
+(jobserver_acquire): If the non-blocking read() returns without
+taking a token then try again.
+---
+ posixos.c | 97 ++++++++++++++++++++++++++++++++++++++++++++++-----------------
+ 1 file changed, 71 insertions(+), 26 deletions(-)
+
+diff --git posixos.c posixos.c
+index e642d7f..dbafa51 100644
+--- posixos.c
++++ posixos.c
+@@ -62,6 +62,24 @@ make_job_rfd (void)
+ #endif
+ }
+ 
++static void
++set_blocking (int fd, int blocking)
++{
++  // If we're not using pselect() don't change the blocking
++#ifdef HAVE_PSELECT
++  int flags;
++  EINTRLOOP (flags, fcntl (fd, F_GETFL));
++  if (flags >= 0)
++    {
++      int r;
++      flags = blocking ? (flags & ~O_NONBLOCK) : (flags | O_NONBLOCK);
++      EINTRLOOP (r, fcntl (fd, F_SETFL, flags));
++      if (r < 0)
++        pfatal_with_name ("fcntl(O_NONBLOCK)");
++    }
++#endif
++}
++
+ unsigned int
+ jobserver_setup (int slots)
+ {
+@@ -86,6 +104,9 @@ jobserver_setup (int slots)
+         pfatal_with_name (_("init jobserver pipe"));
+     }
+ 
++  /* When using pselect() we want the read to be non-blocking.  */
++  set_blocking (job_fds[0], 0);
++
+   return 1;
+ }
+ 
+@@ -121,6 +142,9 @@ jobserver_parse_auth (const char *auth)
+       return 0;
+     }
+ 
++  /* When using pselect() we want the read to be non-blocking.  */
++  set_blocking (job_fds[0], 0);
++
+   return 1;
+ }
+ 
+@@ -169,7 +193,10 @@ jobserver_acquire_all (void)
+ {
+   unsigned int tokens = 0;
+ 
+-  /* Close the write side, so the read() won't hang.  */
++  /* Use blocking reads to wait for all outstanding jobs.  */
++  set_blocking (job_fds[0], 1);
++
++  /* Close the write side, so the read() won't hang forever.  */
+   close (job_fds[1]);
+   job_fds[1] = -1;
+ 
+@@ -236,18 +263,12 @@ jobserver_pre_acquire (void)
+ unsigned int
+ jobserver_acquire (int timeout)
+ {
+-  sigset_t empty;
+-  fd_set readfds;
+   struct timespec spec;
+   struct timespec *specp = NULL;
+-  int r;
+-  char intake;
++  sigset_t empty;
+ 
+   sigemptyset (&empty);
+ 
+-  FD_ZERO (&readfds);
+-  FD_SET (job_fds[0], &readfds);
+-
+   if (timeout)
+     {
+       /* Alarm after one second (is this too granular?)  */
+@@ -256,28 +277,52 @@ jobserver_acquire (int timeout)
+       specp = &spec;
+     }
+ 
+-  r = pselect (job_fds[0]+1, &readfds, NULL, NULL, specp, &empty);
+-
+-  if (r == -1)
++  while (1)
+     {
+-      /* Better be SIGCHLD.  */
+-      if (errno != EINTR)
+-        pfatal_with_name (_("pselect jobs pipe"));
+-      return 0;
+-    }
++      fd_set readfds;
++      int r;
++      char intake;
+ 
+-  if (r == 0)
+-    /* Timeout.  */
+-    return 0;
++      FD_ZERO (&readfds);
++      FD_SET (job_fds[0], &readfds);
+ 
+-  /* The read FD is ready: read it!  */
+-  EINTRLOOP (r, read (job_fds[0], &intake, 1));
+-  if (r < 0)
+-    pfatal_with_name (_("read jobs pipe"));
++      r = pselect (job_fds[0]+1, &readfds, NULL, NULL, specp, &empty);
++      if (r < 0)
++        switch (errno)
++          {
++          case EINTR:
++            /* SIGCHLD will show up as an EINTR.  */
++            return 0;
++
++          case EBADF:
++            /* Someone closed the jobs pipe.
++               That shouldn't happen but if it does we're done.  */
++              O (fatal, NILF, _("job server shut down"));
+ 
+-  /* What does it mean if read() returns 0?  It shouldn't happen because only
+-     the master make can reap all the tokens and close the write side...??  */
+-  return r > 0;
++          default:
++            pfatal_with_name (_("pselect jobs pipe"));
++          }
++
++      if (r == 0)
++        /* Timeout.  */
++        return 0;
++
++      /* The read FD is ready: read it!  This is non-blocking.  */
++      EINTRLOOP (r, read (job_fds[0], &intake, 1));
++
++      if (r < 0)
++        {
++          /* Someone sniped our token!  Try again.  */
++          if (errno == EAGAIN)
++            continue;
++
++          pfatal_with_name (_("read jobs pipe"));
++        }
++
++      /* read() should never return 0: only the master make can reap all the
++         tokens and close the write side...??  */
++      return r > 0;
++    }
+ }
+ 
+ #else
+-- 
+cgit v1.0-41-gc330
+
diff --git a/nixpkgs/pkgs/development/tools/build-managers/gnumake/default.nix b/nixpkgs/pkgs/development/tools/build-managers/gnumake/default.nix
new file mode 100644
index 000000000000..fb9dab54049a
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/gnumake/default.nix
@@ -0,0 +1,59 @@
+{ lib, stdenv, fetchurl, guileSupport ? false, pkg-config ? null , guile ? null }:
+
+assert guileSupport -> ( pkg-config != null && guile != null );
+
+let
+  version = "4.3";
+in
+stdenv.mkDerivation {
+  pname = "gnumake";
+  inherit version;
+
+  src = fetchurl {
+    url = "mirror://gnu/make/make-${version}.tar.gz";
+    sha256 = "06cfqzpqsvdnsxbysl5p2fgdgxgl9y4p7scpnrfa8z2zgkjdspz0";
+  };
+
+  patches = [
+    # Purity: don't look for library dependencies (of the form `-lfoo') in /lib
+    # and /usr/lib. It's a stupid feature anyway. Likewise, when searching for
+    # included Makefiles, don't look in /usr/include and friends.
+    ./impure-dirs.patch
+  ];
+
+  nativeBuildInputs = lib.optionals guileSupport [ pkg-config ];
+  buildInputs = lib.optionals guileSupport [ guile ];
+
+  configureFlags = lib.optional guileSupport "--with-guile"
+
+    # Make uses this test to decide whether it should keep track of
+    # subseconds. Apple made this possible with APFS and macOS 10.13.
+    # However, we still support macOS 10.11 and 10.12. Binaries built
+    # in Nixpkgs will be unable to use futimens to set mtime less than
+    # a second. So, tell Make to ignore nanoseconds in mtime here by
+    # overriding the autoconf test for the struct.
+    # See https://github.com/NixOS/nixpkgs/issues/51221 for discussion.
+    ++ lib.optional stdenv.isDarwin "ac_cv_struct_st_mtim_nsec=no";
+
+  outputs = [ "out" "man" "info" ];
+
+  meta = with lib; {
+    homepage = "https://www.gnu.org/software/make/";
+    description = "A tool to control the generation of non-source files from sources";
+    license = licenses.gpl3Plus;
+
+    longDescription = ''
+      Make is a tool which controls the generation of executables and
+      other non-source files of a program from the program's source files.
+
+      Make gets its knowledge of how to build your program from a file
+      called the makefile, which lists each of the non-source files and
+      how to compute it from other files. When you write a program, you
+      should write a makefile for it, so that it is possible to use Make
+      to build and install the program.
+    '';
+
+    platforms = platforms.all;
+    maintainers = [ maintainers.vrthra ];
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/gnumake/impure-dirs.patch b/nixpkgs/pkgs/development/tools/build-managers/gnumake/impure-dirs.patch
new file mode 100644
index 000000000000..6c7d9d2463c3
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/gnumake/impure-dirs.patch
@@ -0,0 +1,25 @@
+diff -Naur a/src/read.c b/src/read.c
+--- a/src/read.c
++++ b/src/read.c
+@@ -109,9 +109,6 @@
+ #endif
+     INCLUDEDIR,
+ #ifndef _AMIGA
+-    "/usr/gnu/include",
+-    "/usr/local/include",
+-    "/usr/include",
+ #endif
+     0
+   };
+diff -Naur a/src/remake.c b/src/remake.c
+--- a/src/remake.c
++++ b/src/remake.c
+@@ -1601,8 +1601,6 @@
+   static const char *dirs[] =
+     {
+ #ifndef _AMIGA
+-      "/lib",
+-      "/usr/lib",
+ #endif
+ #if defined(WINDOWS32) && !defined(LIBDIR)
+ /*
diff --git a/nixpkgs/pkgs/development/tools/build-managers/gradle/default.nix b/nixpkgs/pkgs/development/tools/build-managers/gradle/default.nix
new file mode 100644
index 000000000000..993bd6684639
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/gradle/default.nix
@@ -0,0 +1,90 @@
+{ lib, stdenv, fetchurl, unzip, jdk, java ? jdk, makeWrapper }:
+
+let
+  gradleSpec = { version, nativeVersion, sha256 }: rec {
+    inherit nativeVersion;
+    name = "gradle-${version}";
+    src = fetchurl {
+      inherit sha256;
+      url = "https://services.gradle.org/distributions/${name}-bin.zip";
+    };
+  };
+in rec {
+  gradleGen = {name, src, nativeVersion} : stdenv.mkDerivation {
+    inherit name src nativeVersion;
+
+    dontBuild = true;
+
+    installPhase = ''
+      mkdir -pv $out/lib/gradle/
+      cp -rv lib/ $out/lib/gradle/
+
+      gradle_launcher_jar=$(echo $out/lib/gradle/lib/gradle-launcher-*.jar)
+      test -f $gradle_launcher_jar
+      makeWrapper ${java}/bin/java $out/bin/gradle \
+        --set JAVA_HOME ${java} \
+        --add-flags "-classpath $gradle_launcher_jar org.gradle.launcher.GradleMain"
+    '';
+
+    fixupPhase = if (!stdenv.isLinux) then ":" else
+      let arch = if stdenv.is64bit then "amd64" else "i386"; in ''
+        mkdir patching
+        pushd patching
+        jar xf $out/lib/gradle/lib/native-platform-linux-${arch}-${nativeVersion}.jar
+        patchelf --set-rpath "${stdenv.cc.cc.lib}/lib:${stdenv.cc.cc.lib}/lib64" net/rubygrapefruit/platform/linux-${arch}/libnative-platform.so
+        jar cf native-platform-linux-${arch}-${nativeVersion}.jar .
+        mv native-platform-linux-${arch}-${nativeVersion}.jar $out/lib/gradle/lib/
+        popd
+
+        # The scanner doesn't pick up the runtime dependency in the jar.
+        # Manually add a reference where it will be found.
+        mkdir $out/nix-support
+        echo ${stdenv.cc.cc} > $out/nix-support/manual-runtime-dependencies
+      '';
+
+    nativeBuildInputs = [ makeWrapper unzip ];
+    buildInputs = [ java ];
+
+    meta = {
+      description = "Enterprise-grade build system";
+      longDescription = ''
+        Gradle is a build system which offers you ease, power and freedom.
+        You can choose the balance for yourself. It has powerful multi-project
+        build support. It has a layer on top of Ivy that provides a
+        build-by-convention integration for Ivy. It gives you always the choice
+        between the flexibility of Ant and the convenience of a
+        build-by-convention behavior.
+      '';
+      homepage = "http://www.gradle.org/";
+      license = lib.licenses.asl20;
+      platforms = lib.platforms.unix;
+    };
+  };
+
+  # NOTE: Gradle 7 is a release candidate, so point to 6.8.
+  gradle_latest = gradle_6_8;
+
+  gradle_7 = gradleGen (gradleSpec {
+    version = "7.0-rc-2";
+    nativeVersion = "0.22-milestone-11";
+    sha256 = "0gzvigyvwwizx90vnzhdnbm5rdaki11inxna11s4y67xkn8hrnx5";
+  });
+
+  gradle_6_8 = gradleGen (gradleSpec {
+    version = "6.8.3";
+    nativeVersion = "0.22-milestone-9";
+    sha256 = "01fjrk5nfdp6mldyblfmnkq2gv1rz1818kzgr0k2i1wzfsc73akz";
+  });
+
+  gradle_5_6 = gradleGen (gradleSpec {
+    version = "5.6.4";
+    nativeVersion = "0.18";
+    sha256 = "1f3067073041bc44554d0efe5d402a33bc3d3c93cc39ab684f308586d732a80d";
+  });
+
+  gradle_4_10 = gradleGen (gradleSpec {
+    version = "4.10.3";
+    nativeVersion = "0.14";
+    sha256 = "0vhqxnk0yj3q9jam5w4kpia70i4h0q4pjxxqwynh3qml0vrcn9l6";
+  });
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/gup/default.nix b/nixpkgs/pkgs/development/tools/build-managers/gup/default.nix
new file mode 100644
index 000000000000..dfa65736f99f
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/gup/default.nix
@@ -0,0 +1,42 @@
+{ stdenv, fetchFromGitHub, nix-update-source, lib, python3
+, which, runtimeShell, pychecker ? null }:
+stdenv.mkDerivation rec {
+  version = "0.7.0";
+  src = fetchFromGitHub {
+    owner = "timbertson";
+    repo = "gup";
+    rev = "version-0.7.0";
+    sha256 = "1pwnmlq2pgkkln9sgz4wlb9dqlqw83bkf105qljnlvggc21zm3pv";
+  };
+  pname = "gup";
+  nativeBuildInputs = [ python3 which pychecker ];
+  buildInputs = [ python3 ];
+  strictDeps = true;
+  SKIP_PYCHECKER = pychecker == null;
+  buildPhase = "make python";
+  installPhase = ''
+    mkdir $out
+    cp -r python/bin $out/bin
+  '';
+  passthru.updateScript = ''
+    #!${runtimeShell}
+    set -e
+    echo
+    cd ${toString ./.}
+    ${nix-update-source}/bin/nix-update-source \
+      --prompt version \
+      --replace-attr version \
+      --set owner timbertson \
+      --set repo gup \
+      --set type fetchFromGitHub \
+      --set rev 'version-{version}' \
+      --modify-nix default.nix
+  '';
+  meta = {
+    inherit (src.meta) homepage;
+    description = "A better make, inspired by djb's redo";
+    license = lib.licenses.lgpl2Plus;
+    maintainers = [ lib.maintainers.timbertson ];
+    platforms = lib.platforms.all;
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/icmake/default.nix b/nixpkgs/pkgs/development/tools/build-managers/icmake/default.nix
new file mode 100644
index 000000000000..6320646974ad
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/icmake/default.nix
@@ -0,0 +1,46 @@
+{ lib, stdenv, fetchFromGitLab, makeWrapper, gcc, ncurses }:
+
+stdenv.mkDerivation rec {
+  pname = "icmake";
+  version = "9.03.01";
+
+  src = fetchFromGitLab {
+    sha256 = "05r0a69w0hv2qhjpb2bxd0lmp2vv5r2d4iggg6ly4miam0i318jy";
+    rev = version;
+    repo = "icmake";
+    owner = "fbb-git";
+  };
+
+
+  setSourceRoot = ''
+    sourceRoot=$(echo */icmake)
+  '';
+
+  nativeBuildInputs = [ makeWrapper ];
+  buildInputs = [ gcc ];
+
+  preConfigure = ''
+    patchShebangs ./
+    substituteInPlace INSTALL.im --replace "usr/" ""
+  '';
+
+  buildPhase = ''
+    ./icm_prepare $out
+    ./icm_bootstrap x
+  '';
+
+  installPhase = ''
+    ./icm_install all /
+
+    wrapProgram $out/bin/icmbuild \
+     --prefix PATH : ${ncurses}/bin
+  '';
+
+  meta = with lib; {
+    description = "A program maintenance (make) utility using a C-like grammar";
+    homepage = "https://fbb-git.gitlab.io/icmake/";
+    license = licenses.gpl3;
+    maintainers = with maintainers; [ pSub ];
+    platforms = platforms.linux;
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/jam/default.nix b/nixpkgs/pkgs/development/tools/build-managers/jam/default.nix
new file mode 100644
index 000000000000..859497345ff6
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/jam/default.nix
@@ -0,0 +1,36 @@
+{ lib, stdenv, fetchurl, bison }:
+
+stdenv.mkDerivation rec {
+  name = "jam-2.6.1";
+
+  src = fetchurl {
+    url = "https://swarm.workshop.perforce.com/projects/perforce_software-jam/download/main/${name}.tar";
+    sha256 = "19xkvkpycxfsncxvin6yqrql3x3z9ypc1j8kzls5k659q4kv5rmc";
+  };
+
+  nativeBuildInputs = [ bison ];
+
+  preConfigure = ''
+    unset AR
+  '';
+
+  buildPhase = ''
+    make jam0
+    ./jam0 -j$NIX_BUILD_CORES -sBINDIR=$out/bin install
+  '';
+
+  installPhase = ''
+    mkdir -p $out/doc/jam
+    cp *.html $out/doc/jam
+  '';
+
+  enableParallelBuilding = true;
+
+  meta = with lib; {
+    homepage = "https://www.perforce.com/resources/documentation/jam";
+    license = licenses.free;
+    description = "Just Another Make";
+    maintainers = with maintainers; [ orivej ];
+    platforms = platforms.unix;
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/kati/default.nix b/nixpkgs/pkgs/development/tools/build-managers/kati/default.nix
new file mode 100644
index 000000000000..ed5923e74d0a
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/kati/default.nix
@@ -0,0 +1,27 @@
+{ lib, stdenv, fetchFromGitHub }:
+
+stdenv.mkDerivation {
+  pname = "kati-unstable";
+  version = "2019-09-23";
+
+  src = fetchFromGitHub {
+    owner = "google";
+    repo = "kati";
+    rev = "9da3296746a0cd55b38ebebf91e7f57105a4c36f";
+    sha256 = "0s5dfhgpcbx12b1fqmm8p0jpvrhgrnl9qywv1ksbwhw3pfp7j866";
+  };
+
+  patches = [ ./version.patch ];
+
+  installPhase = ''
+    install -D ckati $out/bin/ckati
+  '';
+
+  meta = with lib; {
+    description = "An experimental GNU make clone";
+    homepage = "https://github.com/google/kati";
+    platforms = platforms.all;
+    license = licenses.asl20;
+    maintainers = with maintainers; [ danielfullmer ];
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/kati/version.patch b/nixpkgs/pkgs/development/tools/build-managers/kati/version.patch
new file mode 100644
index 000000000000..1821ac6bbb73
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/kati/version.patch
@@ -0,0 +1,19 @@
+diff --git a/Makefile.ckati b/Makefile.ckati
+index e4067bb..15518f3 100644
+--- a/Makefile.ckati
++++ b/Makefile.ckati
+@@ -102,14 +102,8 @@ $(KATI_CXX_TEST_EXES): $(KATI_BIN_PATH)/%: $(KATI_INTERMEDIATES_PATH)/%.o
+ 	$(KATI_LD) $^ -o $@ $(KATI_LIBS)
+ 
+ # Rule to generate version.cc
+-KATI_GIT_DIR := $(shell git -C $(KATI_SRC_PATH) rev-parse --show-toplevel)
+-ifneq ($(KATI_GIT_DIR),)
+-KATI_VERSION_DEPS := $(KATI_GIT_DIR)/.git/HEAD $(KATI_GIT_DIR)/.git/index
+-KATI_VERSION := $(shell git -C $(KATI_GIT_DIR) rev-parse HEAD)
+-else
+ KATI_VERSION_DEPS :=
+ KATI_VERSION := unknown
+-endif
+ $(KATI_INTERMEDIATES_PATH)/version.cc: $(KATI_VERSION_DEPS)
+ 	@mkdir -p $(dir $@)
+ 	echo '// +build ignore' > $@
diff --git a/nixpkgs/pkgs/development/tools/build-managers/leiningen/default.nix b/nixpkgs/pkgs/development/tools/build-managers/leiningen/default.nix
new file mode 100644
index 000000000000..51b97b242d5c
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/leiningen/default.nix
@@ -0,0 +1,53 @@
+{ lib, stdenv, fetchurl, makeWrapper
+, coreutils, jdk, rlwrap, gnupg }:
+
+stdenv.mkDerivation rec {
+  pname = "leiningen";
+  version = "2.9.5";
+
+  src = fetchurl {
+    url = "https://raw.github.com/technomancy/leiningen/${version}/bin/lein-pkg";
+    sha256 = "12kv3286a2vkm3qpm2msiks87mkspxddgl7bwiacdias9dfda09n";
+  };
+
+  jarsrc = fetchurl {
+    # NOTE: This is actually a .jar, Github has issues
+    url = "https://github.com/technomancy/leiningen/releases/download/${version}/${pname}-${version}-standalone.zip";
+    sha256 = "1shyvg1471sc3bv4h3ax51626xw8a8w05f43bny6gmp8pyc0qjfz";
+  };
+
+  JARNAME = "${pname}-${version}-standalone.jar";
+
+  dontUnpack = true;
+
+  nativeBuildInputs = [ makeWrapper ];
+  propagatedBuildInputs = [ jdk ];
+
+  # the jar is not in share/java, because it's a standalone jar and should
+  # never be picked up by set-java-classpath.sh
+
+  installPhase = ''
+    mkdir -p $out/bin $out/share
+    cp -v $src $out/bin/lein
+    cp -v $jarsrc $out/share/$JARNAME
+  '';
+
+  fixupPhase = ''
+    chmod +x $out/bin/lein
+    patchShebangs $out/bin/lein
+    substituteInPlace $out/bin/lein \
+      --replace 'LEIN_JAR=/usr/share/java/leiningen-$LEIN_VERSION-standalone.jar' "LEIN_JAR=$out/share/$JARNAME"
+    wrapProgram $out/bin/lein \
+      --prefix PATH ":" "${lib.makeBinPath [ rlwrap coreutils ]}" \
+      --set LEIN_GPG ${gnupg}/bin/gpg \
+      --set JAVA_CMD ${jdk}/bin/java
+  '';
+
+  meta = {
+    homepage = "https://leiningen.org/";
+    description = "Project automation for Clojure";
+    license = lib.licenses.epl10;
+    platforms = lib.platforms.linux ++ lib.platforms.darwin;
+    maintainers = with lib.maintainers; [ thiagokokada ];
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/mage/default.nix b/nixpkgs/pkgs/development/tools/build-managers/mage/default.nix
new file mode 100644
index 000000000000..d8ccd3ad2fe0
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/mage/default.nix
@@ -0,0 +1,31 @@
+{ buildGoModule, fetchFromGitHub, lib }:
+
+buildGoModule rec {
+  pname = "mage";
+  version = "1.11.0";
+
+  src = fetchFromGitHub {
+    owner = "magefile";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "sha256-ghOk44VcQUAAYm9NCLsgYdky1KEpwOeChBNrgUKjnC8=";
+  };
+
+  vendorSha256 = null;
+
+  doCheck = false;
+
+  buildFlagsArray = [
+    "-ldflags="
+    "-X github.com/magefile/mage/mage.commitHash=v${version}"
+    "-X github.com/magefile/mage/mage.gitTag=v${version}"
+    "-X github.com/magefile/mage/mage.timestamp=1970-01-01T00:00:00Z"
+  ];
+
+  meta = with lib; {
+    description = "A Make/Rake-like Build Tool Using Go";
+    homepage = "https://magefile.org/";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ swdunlop ];
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/meson/allow-dirs-outside-of-prefix.patch b/nixpkgs/pkgs/development/tools/build-managers/meson/allow-dirs-outside-of-prefix.patch
new file mode 100644
index 000000000000..4eb292a2e529
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/meson/allow-dirs-outside-of-prefix.patch
@@ -0,0 +1,19 @@
+--- a/mesonbuild/coredata.py
++++ b/mesonbuild/coredata.py
+@@ -506,7 +506,6 @@ class CoreData:
+             return value
+         if option.name.endswith('dir') and value.is_absolute() and \
+            option not in BULITIN_DIR_NOPREFIX_OPTIONS:
+-            # Value must be a subdir of the prefix
+             # commonpath will always return a path in the native format, so we
+             # must use pathlib.PurePath to do the same conversion before
+             # comparing.
+@@ -518,7 +517,7 @@ class CoreData:
+             try:
+                 value = value.relative_to(prefix)
+             except ValueError:
+-                raise MesonException(msg.format(option, value, prefix))
++                pass
+             if '..' in str(value):
+                 raise MesonException(msg.format(option, value, prefix))
+         return value.as_posix()
diff --git a/nixpkgs/pkgs/development/tools/build-managers/meson/boost-Do-not-add-system-paths-on-nix.patch b/nixpkgs/pkgs/development/tools/build-managers/meson/boost-Do-not-add-system-paths-on-nix.patch
new file mode 100644
index 000000000000..5b9020b3d540
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/meson/boost-Do-not-add-system-paths-on-nix.patch
@@ -0,0 +1,40 @@
+From 536108b10271f2f42d41c7d9ddb4ce2ea1851f4f Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Niklas=20Hamb=C3=BCchen?= <mail@nh2.me>
+Date: Sat, 17 Oct 2020 19:27:08 +0200
+Subject: [PATCH] boost: Do not add system paths on nix
+
+---
+ mesonbuild/dependencies/boost.py | 17 +----------------
+ 1 file changed, 1 insertion(+), 16 deletions(-)
+
+diff --git a/mesonbuild/dependencies/boost.py b/mesonbuild/dependencies/boost.py
+index 907c0c275..ecaf11b18 100644
+--- a/mesonbuild/dependencies/boost.py
++++ b/mesonbuild/dependencies/boost.py
+@@ -643,22 +643,7 @@ class BoostDependency(ExternalDependency):
+             roots += [x for x in candidates if x.name.lower().startswith('boost') and x.is_dir()]
+         else:
+             tmp = []  # type: T.List[Path]
+-
+-            # Homebrew
+-            brew_boost = Path('/usr/local/Cellar/boost')
+-            if brew_boost.is_dir():
+-                tmp += [x for x in brew_boost.iterdir()]
+-
+-            # Add some default system paths
+-            tmp += [Path('/opt/local')]
+-            tmp += [Path('/usr/local/opt/boost')]
+-            tmp += [Path('/usr/local')]
+-            tmp += [Path('/usr')]
+-
+-            # Cleanup paths
+-            tmp = [x for x in tmp if x.is_dir()]
+-            tmp = [x.resolve() for x in tmp]
+-            roots += tmp
++            # Do not add any non-explicit paths on nix
+ 
+         return roots
+ 
+-- 
+2.25.4
+
diff --git a/nixpkgs/pkgs/development/tools/build-managers/meson/clear-old-rpath.patch b/nixpkgs/pkgs/development/tools/build-managers/meson/clear-old-rpath.patch
new file mode 100644
index 000000000000..f1e3c76e8b53
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/meson/clear-old-rpath.patch
@@ -0,0 +1,20 @@
+diff --git a/mesonbuild/scripts/depfixer.py b/mesonbuild/scripts/depfixer.py
+index 4176b9a03..faaabf616 100644
+--- a/mesonbuild/scripts/depfixer.py
++++ b/mesonbuild/scripts/depfixer.py
+@@ -336,6 +336,15 @@ class Elf(DataSizes):
+         if not new_rpath:
+             self.remove_rpath_entry(entrynum)
+         else:
++            # Clear old rpath to avoid stale references,
++            # not heeding the warning above about de-duplication
++            # since it does not seem to cause issues for us
++            # and not doing so trips up Nix’s reference checker.
++            # See https://github.com/NixOS/nixpkgs/pull/46020
++            # and https://github.com/NixOS/nixpkgs/issues/95163
++            self.bf.seek(rp_off)
++            self.bf.write(b'\0'*len(old_rpath))
++
+             self.bf.seek(rp_off)
+             self.bf.write(new_rpath)
+             self.bf.write(b'\0')
diff --git a/nixpkgs/pkgs/development/tools/build-managers/meson/default.nix b/nixpkgs/pkgs/development/tools/build-managers/meson/default.nix
new file mode 100644
index 000000000000..de82609a5486
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/meson/default.nix
@@ -0,0 +1,95 @@
+{ lib
+, python3
+
+, writeTextDir
+, substituteAll
+, fetchpatch
+, installShellFiles
+}:
+
+python3.pkgs.buildPythonApplication rec {
+  pname = "meson";
+  version = "0.57.1";
+
+  src = python3.pkgs.fetchPypi {
+    inherit pname version;
+    sha256 = "19n8alcpzv6npgp27iqljkmvdmr7s2c7zm8y997j1nlvpa1cgqbj";
+  };
+
+  patches = [
+    # Upstream insists on not allowing bindir and other dir options
+    # outside of prefix for some reason:
+    # https://github.com/mesonbuild/meson/issues/2561
+    # We remove the check so multiple outputs can work sanely.
+    ./allow-dirs-outside-of-prefix.patch
+
+    # Meson is currently inspecting fewer variables than autoconf does, which
+    # makes it harder for us to use setup hooks, etc.  Taken from
+    # https://github.com/mesonbuild/meson/pull/6827
+    ./more-env-vars.patch
+
+    # Unlike libtool, vanilla Meson does not pass any information
+    # about the path library will be installed to to g-ir-scanner,
+    # breaking the GIR when path other than ${!outputLib}/lib is used.
+    # We patch Meson to add a --fallback-library-path argument with
+    # library install_dir to g-ir-scanner.
+    ./gir-fallback-path.patch
+
+    # In common distributions, RPATH is only needed for internal libraries so
+    # meson removes everything else. With Nix, the locations of libraries
+    # are not as predictable, therefore we need to keep them in the RPATH.
+    # At the moment we are keeping the paths starting with /nix/store.
+    # https://github.com/NixOS/nixpkgs/issues/31222#issuecomment-365811634
+    (substituteAll {
+      src = ./fix-rpath.patch;
+      inherit (builtins) storeDir;
+    })
+
+    # When Meson removes build_rpath from DT_RUNPATH entry, it just writes
+    # the shorter NUL-terminated new rpath over the old one to reduce
+    # the risk of potentially breaking the ELF files.
+    # But this can cause much bigger problem for Nix as it can produce
+    # cut-in-half-by-\0 store path references.
+    # Let’s just clear the whole rpath and hope for the best.
+    ./clear-old-rpath.patch
+
+    # Patch out default boost search paths to avoid impure builds on
+    # unsandboxed non-NixOS builds, see:
+    # https://github.com/NixOS/nixpkgs/issues/86131#issuecomment-711051774
+    ./boost-Do-not-add-system-paths-on-nix.patch
+  ];
+
+  setupHook = ./setup-hook.sh;
+
+  # 0.45 update enabled tests but they are failing
+  doCheck = false;
+  # checkInputs = [ ninja pkg-config ];
+  # checkPhase = "python ./run_project_tests.py";
+
+  postFixup = ''
+    pushd $out/bin
+    # undo shell wrapper as meson tools are called with python
+    for i in *; do
+      mv ".$i-wrapped" "$i"
+    done
+    popd
+
+    # Do not propagate Python
+    rm $out/nix-support/propagated-build-inputs
+  '';
+
+  nativeBuildInputs = [ installShellFiles ];
+
+  postInstall = ''
+    installShellCompletion --zsh data/shell-completions/zsh/_meson
+    installShellCompletion --bash data/shell-completions/bash/meson
+  '';
+
+  meta = with lib; {
+    homepage = "https://mesonbuild.com";
+    description = "SCons-like build system that use python as a front-end language and Ninja as a building backend";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ jtojnar mbe ];
+    platforms = platforms.all;
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/meson/fix-rpath.patch b/nixpkgs/pkgs/development/tools/build-managers/meson/fix-rpath.patch
new file mode 100644
index 000000000000..d34b6c4c4345
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/meson/fix-rpath.patch
@@ -0,0 +1,24 @@
+--- a/mesonbuild/backend/backends.py
++++ b/mesonbuild/backend/backends.py
+@@ -456,6 +456,21 @@ class Backend:
+                 args.extend(self.environment.coredata.get_external_link_args(target.for_machine, lang))
+             except Exception:
+                 pass
++
++        nix_ldflags = os.environ.get('NIX_LDFLAGS', '').split()
++        next_is_path = False
++        # Try to add rpaths set by user or ld-wrapper so that they are not removed.
++        # Based on https://github.com/NixOS/nixpkgs/blob/69711a2f5ffe8cda208163be5258266172ff527f/pkgs/build-support/bintools-wrapper/ld-wrapper.sh#L148-L177
++        for flag in nix_ldflags:
++            if flag == '-rpath' or flag == '-L':
++                next_is_path = True
++            elif next_is_path or flag.startswith('-L/'):
++                if flag.startswith('-L/'):
++                    flag = flag[2:]
++                if flag.startswith('@storeDir@'):
++                    dirs.add(flag)
++                next_is_path = False
++
+         # Match rpath formats:
+         # -Wl,-rpath=
+         # -Wl,-rpath,
diff --git a/nixpkgs/pkgs/development/tools/build-managers/meson/gir-fallback-path.patch b/nixpkgs/pkgs/development/tools/build-managers/meson/gir-fallback-path.patch
new file mode 100644
index 000000000000..0c924bacf73f
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/meson/gir-fallback-path.patch
@@ -0,0 +1,16 @@
+--- a/mesonbuild/modules/gnome.py
++++ b/mesonbuild/modules/gnome.py
+@@ -807,6 +807,13 @@ class GnomeModule(ExtensionModule):
+         if fatal_warnings:
+             scan_command.append('--warn-error')
+ 
++        if len(set([girtarget.get_custom_install_dir()[0] for girtarget in girtargets])) > 1:
++            raise MesonException('generate_gir tries to build multiple libraries with different install_dir at once: {}'.format(','.join([str(girtarget) for girtarget in girtargets])))
++
++        fallback_libpath = girtargets[0].get_custom_install_dir()[0]
++        if fallback_libpath is not None and isinstance(fallback_libpath, str) and len(fallback_libpath) > 0 and fallback_libpath[0] == "/":
++            scan_command += ['--fallback-library-path=' + fallback_libpath]
++
+         scan_target = self._make_gir_target(state, girfile, scan_command, depends, kwargs)
+ 
+         typelib_output = '%s-%s.typelib' % (ns, nsversion)
diff --git a/nixpkgs/pkgs/development/tools/build-managers/meson/more-env-vars.patch b/nixpkgs/pkgs/development/tools/build-managers/meson/more-env-vars.patch
new file mode 100644
index 000000000000..4b2606e2d694
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/meson/more-env-vars.patch
@@ -0,0 +1,13 @@
+diff --git a/mesonbuild/environment.py b/mesonbuild/environment.py
+index 756dd8193..a5cc6ef8b 100644
+--- a/mesonbuild/environment.py
++++ b/mesonbuild/environment.py
+@@ -151,7 +151,7 @@ def _get_env_var(for_machine: MachineChoice, is_cross: bool, var_name: str) -> T
+         # compiling we fall back on the unprefixed host version. This
+         # allows native builds to never need to worry about the 'BUILD_*'
+         # ones.
+-        ([var_name + '_FOR_BUILD'] if is_cross else [var_name]),
++        [var_name + '_FOR_BUILD'] + ([] if is_cross else [var_name]),
+         # Always just the unprefixed host verions
+         [var_name]
+     )[for_machine]
diff --git a/nixpkgs/pkgs/development/tools/build-managers/meson/setup-hook.sh b/nixpkgs/pkgs/development/tools/build-managers/meson/setup-hook.sh
new file mode 100644
index 000000000000..3d946fcffd52
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/meson/setup-hook.sh
@@ -0,0 +1,37 @@
+mesonConfigurePhase() {
+    runHook preConfigure
+
+    if [ -z "${dontAddPrefix-}" ]; then
+        mesonFlags="--prefix=$prefix $mesonFlags"
+    fi
+
+    # See multiple-outputs.sh and meson’s coredata.py
+    mesonFlags="\
+        --libdir=${!outputLib}/lib --libexecdir=${!outputLib}/libexec \
+        --bindir=${!outputBin}/bin --sbindir=${!outputBin}/sbin \
+        --includedir=${!outputInclude}/include \
+        --mandir=${!outputMan}/share/man --infodir=${!outputInfo}/share/info \
+        --localedir=${!outputLib}/share/locale \
+        -Dauto_features=${mesonAutoFeatures:-enabled} \
+        -Dwrap_mode=${mesonWrapMode:-nodownload} \
+        $mesonFlags"
+
+    mesonFlags="${crossMesonFlags+$crossMesonFlags }--buildtype=${mesonBuildType:-plain} $mesonFlags"
+
+    echo "meson flags: $mesonFlags ${mesonFlagsArray[@]}"
+
+    meson build $mesonFlags "${mesonFlagsArray[@]}"
+    cd build
+
+    if ! [[ -v enableParallelBuilding ]]; then
+        enableParallelBuilding=1
+        echo "meson: enabled parallel building"
+    fi
+
+    runHook postConfigure
+}
+
+if [ -z "${dontUseMesonConfigure-}" -a -z "${configurePhase-}" ]; then
+    setOutputFlags=
+    configurePhase=mesonConfigurePhase
+fi
diff --git a/nixpkgs/pkgs/development/tools/build-managers/mill/default.nix b/nixpkgs/pkgs/development/tools/build-managers/mill/default.nix
new file mode 100644
index 000000000000..4538c212da58
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/mill/default.nix
@@ -0,0 +1,42 @@
+{ lib, stdenv, fetchurl, jre, makeWrapper }:
+
+stdenv.mkDerivation rec {
+  pname = "mill";
+  version = "0.9.5";
+
+  src = fetchurl {
+    url = "https://github.com/com-lihaoyi/mill/releases/download/${version}/${version}";
+    sha256 = "142vr40p60mapvvb5amn8hz6a8930kxsz510baql40hai4yhga7z";
+  };
+
+  nativeBuildInputs = [ makeWrapper ];
+
+  dontUnpack = true;
+  dontConfigure = true;
+  dontBuild = true;
+
+  installPhase = ''
+    runHook preInstall
+    install -Dm555 "$src" "$out/bin/.mill-wrapped"
+    # can't use wrapProgram because it sets --argv0
+    makeWrapper "$out/bin/.mill-wrapped" "$out/bin/mill" \
+      --prefix PATH : "${jre}/bin" \
+      --set JAVA_HOME "${jre}"
+    runHook postInstall
+  '';
+
+  meta = with lib; {
+    homepage = "https://www.lihaoyi.com/mill";
+    license = licenses.mit;
+    description = "A build tool for Scala, Java and more";
+    longDescription = ''
+      Mill is a build tool borrowing ideas from modern tools like Bazel, to let you build
+      your projects in a way that's simple, fast, and predictable. Mill has built in
+      support for the Scala programming language, and can serve as a replacement for
+      SBT, but can also be extended to support any other language or platform via
+      modules (written in Java or Scala) or through an external subprocesses.
+    '';
+    maintainers = with maintainers; [ scalavision ];
+    platforms = lib.platforms.all;
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/mk/builder.sh b/nixpkgs/pkgs/development/tools/build-managers/mk/builder.sh
new file mode 100644
index 000000000000..73678ae9f5cc
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/mk/builder.sh
@@ -0,0 +1,4 @@
+source $stdenv/setup
+installFlags="PREFIX=$out"
+preInstall="mkdir -p $out/man/man1 $out/bin"
+genericBuild
diff --git a/nixpkgs/pkgs/development/tools/build-managers/mk/default.nix b/nixpkgs/pkgs/development/tools/build-managers/mk/default.nix
new file mode 100644
index 000000000000..1eaa51a5de0b
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/mk/default.nix
@@ -0,0 +1,14 @@
+{lib, stdenv, fetchurl}:
+
+stdenv.mkDerivation {
+  name = "mk-2006-01-31";
+  src = fetchurl {
+    url = "http://tarballs.nixos.org/mk-20060131.tar.gz";
+    sha256 = "0za8dp1211bdp4584xb59liqpww7w1ql0cmlv34p9y928nibcxsr";
+  };
+  builder = ./builder.sh;
+
+  meta = {
+    platforms = lib.platforms.unix;
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/msbuild/default.nix b/nixpkgs/pkgs/development/tools/build-managers/msbuild/default.nix
new file mode 100644
index 000000000000..82c5c88d174e
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/msbuild/default.nix
@@ -0,0 +1,133 @@
+{ lib, stdenv, fetchurl, makeWrapper, glibcLocales, mono, dotnetPackages, unzip, dotnet-sdk }:
+
+let
+
+  xplat = fetchurl {
+    url = "https://github.com/mono/msbuild/releases/download/0.07/mono_msbuild_xplat-master-8f608e49.zip";
+    sha256 = "1jxq3fk9a6q2a8i9zacxaz3fkvc22i9qvzlpa7wbb95h42g0ffhq";
+  };
+
+  deps = import ./nuget.nix { inherit fetchurl; };
+
+in
+
+stdenv.mkDerivation rec {
+  pname = "msbuild";
+  version = "16.3+xamarinxplat.2019.07.26.14.57";
+
+  src = fetchurl {
+    url = "https://download.mono-project.com/sources/msbuild/msbuild-${version}.tar.xz";
+    sha256 = "1zcdfx4xsh62wj3g1jc2an0lppsfs691lz4dv05xbgi01aq1hk6a";
+  };
+
+  nativeBuildInputs = [
+    dotnet-sdk
+    mono
+    unzip
+  ];
+
+  buildInputs = [
+    dotnetPackages.Nuget
+    glibcLocales
+    makeWrapper
+  ];
+
+  # https://aur.archlinux.org/cgit/aur.git/tree/PKGBUILD?h=msbuild
+  phases = ["unpackPhase" "buildPhase" "installPhase" "installCheckPhase"];
+
+  # https://github.com/NixOS/nixpkgs/issues/38991
+  # bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)
+  LOCALE_ARCHIVE = lib.optionalString stdenv.isLinux
+      "${glibcLocales}/lib/locale/locale-archive";
+
+  buildPhase = ''
+    # nuget would otherwise try to base itself in /homeless-shelter
+    export HOME=$(pwd)/fake-home
+
+    for package in ${toString deps}; do
+      nuget add $package -Source nixos
+    done
+
+    nuget sources Disable -Name "nuget.org"
+    nuget sources Add -Name nixos -Source $(pwd)/nixos
+
+    # license check is case sensitive
+    mv LICENSE license.bak && mv license.bak license
+
+    mkdir -p artifacts
+    unzip ${xplat} -d artifacts
+    mv artifacts/msbuild artifacts/mono-msbuild
+    chmod +x artifacts/mono-msbuild/MSBuild.dll
+
+    ln -s $(find ${dotnet-sdk} -name libhostfxr.so) artifacts/mono-msbuild/SdkResolvers/Microsoft.DotNet.MSBuildSdkResolver/
+
+    # overwrite the file
+    echo "#!${stdenv.shell}" > eng/common/dotnet-install.sh
+
+    # msbuild response files to use only the nixos source
+    echo "/p:RestoreSources=nixos" > artifacts/mono-msbuild/MSBuild.rsp
+    echo "/p:RestoreSources=nixos" > src/MSBuild/MSBuild.rsp
+
+    # not patchShebangs, there is /bin/bash in the body of the script as well
+    substituteInPlace ./eng/cibuild_bootstrapped_msbuild.sh --replace /bin/bash ${stdenv.shell}
+
+    # DisableNerdbankVersioning https://gitter.im/Microsoft/msbuild/archives/2018/06/27?at=5b33dbc4ce3b0f268d489bfa
+    # TODO there are some (many?) failing tests
+    ./eng/cibuild_bootstrapped_msbuild.sh --host_type mono --configuration Release --skip_tests /p:DisableNerdbankVersioning=true
+  '';
+
+  installPhase = ''
+    mono artifacts/mono-msbuild/MSBuild.dll mono/build/install.proj /p:MonoInstallPrefix="$out" /p:Configuration=Release-MONO
+
+    ln -s ${mono}/lib/mono/msbuild/Current/bin/Roslyn $out/lib/mono/msbuild/Current/bin/Roslyn
+
+    makeWrapper ${mono}/bin/mono $out/bin/msbuild \
+      --set MSBuildExtensionsPath $out/lib/mono/xbuild \
+      --set-default MONO_GC_PARAMS "nursery-size=64m" \
+      --add-flags "$out/lib/mono/msbuild/15.0/bin/MSBuild.dll"
+  '';
+
+  doInstallCheck = true;
+
+  # https://docs.microsoft.com/cs-cz/visualstudio/msbuild/walkthrough-creating-an-msbuild-project-file-from-scratch?view=vs-2019
+  installCheckPhase = ''
+    cat > Helloworld.cs <<EOF
+using System;
+
+class HelloWorld
+{
+    static void Main()
+    {
+#if DebugConfig
+        Console.WriteLine("WE ARE IN THE DEBUG CONFIGURATION");
+#endif
+
+        Console.WriteLine("Hello, world!");
+    }
+}
+EOF
+
+    cat > Helloworld.csproj <<EOF
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Compile Include="Helloworld.cs" />
+  </ItemGroup>
+  <Target Name="Build">
+    <Csc Sources="@(Compile)"/>
+  </Target>
+</Project>
+EOF
+
+    $out/bin/msbuild Helloworld.csproj -t:Build
+    ${mono}/bin/mono Helloworld.exe | grep "Hello, world!"
+  '';
+
+  meta = with lib; {
+    description = "Mono version of Microsoft Build Engine, the build platform for .NET, and Visual Studio";
+    homepage = "https://github.com/mono/msbuild";
+    license = licenses.mit;
+    maintainers = with maintainers; [ jdanek ];
+    platforms = platforms.unix;
+  };
+}
+
diff --git a/nixpkgs/pkgs/development/tools/build-managers/msbuild/nuget.nix b/nixpkgs/pkgs/development/tools/build-managers/msbuild/nuget.nix
new file mode 100644
index 000000000000..0aae3840752d
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/msbuild/nuget.nix
@@ -0,0 +1,1130 @@
+{ fetchurl }: let
+
+  fetchNuGet = { url, name, version, sha256 }: fetchurl {
+    inherit name url sha256;
+  };
+
+in [
+(fetchNuGet {
+        name = "microsoft.build";
+        version = "14.3.0";
+        url = "https://www.nuget.org/api/v2/package/microsoft.build/14.3.0";
+        sha256 = "1zamn3p8xxi0wsjlpln0y71ncb977f3fp08mvaz4wmbmi76nr0rz";
+        })
+(fetchNuGet {
+        name = "system.io";
+        version = "4.1.0";
+        url = "https://www.nuget.org/api/v2/package/system.io/4.1.0";
+        sha256 = "1g0yb8p11vfd0kbkyzlfsbsp5z44lwsvyc0h3dpw6vqnbi035ajp";
+        })
+(fetchNuGet {
+        name = "system.io";
+        version = "4.3.0";
+        url = "https://www.nuget.org/api/v2/package/system.io/4.3.0";
+        sha256 = "05l9qdrzhm4s5dixmx68kxwif4l99ll5gqmh7rqgw554fx0agv5f";
+        })
+(fetchNuGet {
+        name = "system.xml.xpath";
+        version = "4.3.0";
+        url = "https://www.nuget.org/api/v2/package/system.xml.xpath/4.3.0";
+        sha256 = "1cv2m0p70774a0sd1zxc8fm8jk3i5zk2bla3riqvi8gsm0r4kpci";
+        })
+(fetchNuGet {
+        name = "microsoft.net.compilers.toolset";
+        version = "3.3.0-beta2-19367-02";
+        url = "https://dotnetfeed.blob.core.windows.net/dotnet-core/flatcontainer/microsoft.net.compilers.toolset/3.3.0-beta2-19367-02/microsoft.net.compilers.toolset.3.3.0-beta2-19367-02.nupkg";
+        sha256 = "1v9lz2fmfprhql0klqa8iipiiz3wcflvlgr3a86pcjjk7x0y84sl";
+        })
+(fetchNuGet {
+        name = "system.io.filesystem";
+        version = "4.0.1";
+        url = "https://www.nuget.org/api/v2/package/system.io.filesystem/4.0.1";
+        sha256 = "0kgfpw6w4djqra3w5crrg8xivbanh1w9dh3qapb28q060wb9flp1";
+        })
+(fetchNuGet {
+        name = "system.io.filesystem";
+        version = "4.3.0";
+        url = "https://www.nuget.org/api/v2/package/system.io.filesystem/4.3.0";
+        sha256 = "0z2dfrbra9i6y16mm9v1v6k47f0fm617vlb7s5iybjjsz6g1ilmw";
+        })
+(fetchNuGet {
+        name = "largeaddressaware";
+        version = "1.0.3";
+        url = "https://www.nuget.org/api/v2/package/largeaddressaware/1.0.3";
+        sha256 = "1ppss9bgj0hf5s8307bnm2a4qm10mrymp0v12m28a5q81zjz0fr5";
+        })
+(fetchNuGet {
+        name = "nuget.protocol";
+        version = "5.2.0-rtm.6067";
+        url = "https://dotnet.myget.org/F/nuget-build/api/v2/package/nuget.protocol/5.2.0-rtm.6067";
+        sha256 = "0fm3qgcdsy6dy6fih0n9a4w39mzdha4cz51gr9pp9g4nag34za2a";
+        })
+(fetchNuGet {
+        name = "runtime.native.system.security.cryptography.openssl";
+        version = "4.3.0";
+        url = "https://www.nuget.org/api/v2/package/runtime.native.system.security.cryptography.openssl/4.3.0";
+        sha256 = "18pzfdlwsg2nb1jjjjzyb5qlgy6xjxzmhnfaijq5s2jw3cm3ab97";
+        })
+(fetchNuGet {
+        name = "runtime.ubuntu.14.04-x64.runtime.native.system.security.cryptography.openssl";
+        version = "4.3.0";
+        url = "https://www.nuget.org/api/v2/package/runtime.ubuntu.14.04-x64.runtime.native.system.security.cryptography.openssl/4.3.0";
+        sha256 = "160p68l2c7cqmyqjwxydcvgw7lvl1cr0znkw8fp24d1by9mqc8p3";
+        })
+(fetchNuGet {
+        name = "system.buffers";
+        version = "4.3.0";
+        url = "https://www.nuget.org/api/v2/package/system.buffers/4.3.0";
+        sha256 = "0fgns20ispwrfqll4q1zc1waqcmylb3zc50ys9x8zlwxh9pmd9jy";
+        })
+(fetchNuGet {
+        name = "system.buffers";
+        version = "4.4.0";
+        url = "https://www.nuget.org/api/v2/package/system.buffers/4.4.0";
+        sha256 = "183f8063w8zqn99pv0ni0nnwh7fgx46qzxamwnans55hhs2l0g19";
+        })
+(fetchNuGet {
+        name = "xunit.core";
+        version = "2.4.1";
+        url = "https://www.nuget.org/api/v2/package/xunit.core/2.4.1";
+        sha256 = "1nnb3j4kzmycaw1g76ii4rfqkvg6l8gqh18falwp8g28h802019a";
+        })
+(fetchNuGet {
+        name = "system.io.filesystem.primitives";
+        version = "4.3.0";
+        url = "https://www.nuget.org/api/v2/package/system.io.filesystem.primitives/4.3.0";
+        sha256 = "0j6ndgglcf4brg2lz4wzsh1av1gh8xrzdsn9f0yznskhqn1xzj9c";
+        })
+(fetchNuGet {
+        name = "system.io.filesystem.primitives";
+        version = "4.0.1";
+        url = "https://www.nuget.org/api/v2/package/system.io.filesystem.primitives/4.0.1";
+        sha256 = "1s0mniajj3lvbyf7vfb5shp4ink5yibsx945k6lvxa96r8la1612";
+        })
+(fetchNuGet {
+        name = "system.xml.xmldocument";
+        version = "4.0.1";
+        url = "https://www.nuget.org/api/v2/package/system.xml.xmldocument/4.0.1";
+        sha256 = "0ihsnkvyc76r4dcky7v3ansnbyqjzkbyyia0ir5zvqirzan0bnl1";
+        })
+(fetchNuGet {
+        name = "system.xml.xmldocument";
+        version = "4.3.0";
+        url = "https://www.nuget.org/api/v2/package/system.xml.xmldocument/4.3.0";
+        sha256 = "0bmz1l06dihx52jxjr22dyv5mxv6pj4852lx68grjm7bivhrbfwi";
+        })
+(fetchNuGet {
+        name = "microsoft.build.framework";
+        version = "15.5.180";
+        url = "https://www.nuget.org/api/v2/package/microsoft.build.framework/15.5.180";
+        sha256 = "064y3a711ikx9pm9d2wyms4i3k4f9hfvn3vymhwygg7yv7gcj92z";
+        })
+(fetchNuGet {
+        name = "microsoft.build.framework";
+        version = "14.3.0";
+        url = "https://www.nuget.org/api/v2/package/microsoft.build.framework/14.3.0";
+        sha256 = "0r7y1i7dbr3pb53fdrh268hyi627w85nzv2iblwyg8dzkfxraafd";
+        })
+(fetchNuGet {
+        name = "system.globalization";
+        version = "4.3.0";
+        url = "https://www.nuget.org/api/v2/package/system.globalization/4.3.0";
+        sha256 = "1cp68vv683n6ic2zqh2s1fn4c2sd87g5hpp6l4d4nj4536jz98ki";
+        })
+(fetchNuGet {
+        name = "system.globalization";
+        version = "4.0.11";
+        url = "https://www.nuget.org/api/v2/package/system.globalization/4.0.11";
+        sha256 = "070c5jbas2v7smm660zaf1gh0489xanjqymkvafcs4f8cdrs1d5d";
+        })
+(fetchNuGet {
+        name = "microsoft.dotnet.signtool";
+        version = "1.0.0-beta.19372.10";
+        url = "https://dotnetfeed.blob.core.windows.net/dotnet-core/flatcontainer/microsoft.dotnet.signtool/1.0.0-beta.19372.10/microsoft.dotnet.signtool.1.0.0-beta.19372.10.nupkg";
+        sha256 = "1f2im2lilw10zslfclxh49knr542jy7q09p009flxsgn68riy0j6";
+        })
+(fetchNuGet {
+        name = "system.runtime.handles";
+        version = "4.3.0";
+        url = "https://www.nuget.org/api/v2/package/system.runtime.handles/4.3.0";
+        sha256 = "0sw2gfj2xr7sw9qjn0j3l9yw07x73lcs97p8xfc9w1x9h5g5m7i8";
+        })
+(fetchNuGet {
+        name = "system.runtime.handles";
+        version = "4.0.1";
+        url = "https://www.nuget.org/api/v2/package/system.runtime.handles/4.0.1";
+        sha256 = "1g0zrdi5508v49pfm3iii2hn6nm00bgvfpjq1zxknfjrxxa20r4g";
+        })
+(fetchNuGet {
+        name = "microsoft.codeanalysis.common";
+        version = "3.0.0-beta1-61516-01";
+        url = "https://dotnet.myget.org/F/roslyn/api/v2/package/microsoft.codeanalysis.common/3.0.0-beta1-61516-01";
+        sha256 = "1qfm61yrsmihhir7n3hb5ccn1r50i39rv1g74880ma7ihjl1hz54";
+        })
+(fetchNuGet {
+        name = "microsoft.netcore.platforms";
+        version = "1.0.1";
+        url = "https://www.nuget.org/api/v2/package/microsoft.netcore.platforms/1.0.1";
+        sha256 = "01al6cfxp68dscl15z7rxfw9zvhm64dncsw09a1vmdkacsa2v6lr";
+        })
+(fetchNuGet {
+        name = "microsoft.netcore.platforms";
+        version = "1.1.0";
+        url = "https://www.nuget.org/api/v2/package/microsoft.netcore.platforms/1.1.0";
+        sha256 = "08vh1r12g6ykjygq5d3vq09zylgb84l63k49jc4v8faw9g93iqqm";
+        })
+(fetchNuGet {
+        name = "system.reflection.primitives";
+        version = "4.3.0";
+        url = "https://www.nuget.org/api/v2/package/system.reflection.primitives/4.3.0";
+        sha256 = "04xqa33bld78yv5r93a8n76shvc8wwcdgr1qvvjh959g3rc31276";
+        })
+(fetchNuGet {
+        name = "system.reflection.primitives";
+        version = "4.0.1";
+        url = "https://www.nuget.org/api/v2/package/system.reflection.primitives/4.0.1";
+        sha256 = "1bangaabhsl4k9fg8khn83wm6yial8ik1sza7401621jc6jrym28";
+        })
+(fetchNuGet {
+        name = "microbuild.core";
+        version = "0.2.0";
+        url = "https://www.nuget.org/api/v2/package/microbuild.core/0.2.0";
+        sha256 = "0q4s45jskbyxfx4ay6znnvv94zma2wd85b8rwmwszd2nb0xl3194";
+        })
+(fetchNuGet {
+        name = "system.diagnostics.tracesource";
+        version = "4.0.0";
+        url = "https://www.nuget.org/api/v2/package/system.diagnostics.tracesource/4.0.0";
+        sha256 = "1mc7r72xznczzf6mz62dm8xhdi14if1h8qgx353xvhz89qyxsa3h";
+        })
+(fetchNuGet {
+        name = "system.runtime.numerics";
+        version = "4.3.0";
+        url = "https://www.nuget.org/api/v2/package/system.runtime.numerics/4.3.0";
+        sha256 = "19rav39sr5dky7afygh309qamqqmi9kcwvz3i0c5700v0c5cg61z";
+        })
+(fetchNuGet {
+        name = "system.threading.tasks.parallel";
+        version = "4.3.0";
+        url = "https://www.nuget.org/api/v2/package/system.threading.tasks.parallel/4.3.0";
+        sha256 = "1rr3qa4hxwyj531s4nb3bwrxnxxwz617i0n9gh6x7nr7dd3ayzgh";
+        })
+(fetchNuGet {
+        name = "system.threading.tasks.parallel";
+        version = "4.0.1";
+        url = "https://www.nuget.org/api/v2/package/system.threading.tasks.parallel/4.0.1";
+        sha256 = "114wdg32hr46dfsnns3pgs67kcha5jn47p5gg0mhxfn5vrkr2p75";
+        })
+(fetchNuGet {
+        name = "nuget.credentials";
+        version = "5.2.0-rtm.6067";
+        url = "https://dotnet.myget.org/F/nuget-build/api/v2/package/nuget.credentials/5.2.0-rtm.6067";
+        sha256 = "07g2na590sph9li5igww74i3gqyrj5cb6gsgjh54f1f4bs4x1c4k";
+        })
+(fetchNuGet {
+        name = "system.objectmodel";
+        version = "4.0.12";
+        url = "https://www.nuget.org/api/v2/package/system.objectmodel/4.0.12";
+        sha256 = "1sybkfi60a4588xn34nd9a58png36i0xr4y4v4kqpg8wlvy5krrj";
+        })
+(fetchNuGet {
+        name = "system.objectmodel";
+        version = "4.3.0";
+        url = "https://www.nuget.org/api/v2/package/system.objectmodel/4.3.0";
+        sha256 = "191p63zy5rpqx7dnrb3h7prvgixmk168fhvvkkvhlazncf8r3nc2";
+        })
+(fetchNuGet {
+        name = "system.xml.xmlserializer";
+        version = "4.0.11";
+        url = "https://www.nuget.org/api/v2/package/system.xml.xmlserializer/4.0.11";
+        sha256 = "01nzc3gdslw90qfykq4qzr2mdnqxjl4sj0wp3fixiwdmlmvpib5z";
+        })
+(fetchNuGet {
+        name = "microsoft.codeanalysis.build.tasks";
+        version = "3.0.0-beta1-61516-01";
+        url = "https://dotnet.myget.org/F/roslyn/api/v2/package/microsoft.codeanalysis.build.tasks/3.0.0-beta1-61516-01";
+        sha256 = "1cjpqbd4i0gxhh86nvamlpkisd1krcrya6riwjhghvpjph6115vp";
+        })
+(fetchNuGet {
+        name = "system.private.datacontractserialization";
+        version = "4.1.1";
+        url = "https://www.nuget.org/api/v2/package/system.private.datacontractserialization/4.1.1";
+        sha256 = "1xk9wvgzipssp1393nsg4n16zbr5481k03nkdlj954hzq5jkx89r";
+        })
+(fetchNuGet {
+        name = "system.numerics.vectors";
+        version = "4.4.0";
+        url = "https://www.nuget.org/api/v2/package/system.numerics.vectors/4.4.0";
+        sha256 = "0rdvma399070b0i46c4qq1h2yvjj3k013sqzkilz4bz5cwmx1rba";
+        })
+(fetchNuGet {
+        name = "microsoft.build.centralpackageversions";
+        version = "2.0.1";
+        url = "https://www.nuget.org/api/v2/package/microsoft.build.centralpackageversions/2.0.1";
+        sha256 = "17cjiaj2b98q8s89168g42jb8rhwm6062jcbv57rbkdiiwdsn55k";
+        })
+(fetchNuGet {
+        name = "system.text.encoding.extensions";
+        version = "4.0.11";
+        url = "https://www.nuget.org/api/v2/package/system.text.encoding.extensions/4.0.11";
+        sha256 = "08nsfrpiwsg9x5ml4xyl3zyvjfdi4mvbqf93kjdh11j4fwkznizs";
+        })
+(fetchNuGet {
+        name = "system.text.encoding.extensions";
+        version = "4.3.0";
+        url = "https://www.nuget.org/api/v2/package/system.text.encoding.extensions/4.3.0";
+        sha256 = "11q1y8hh5hrp5a3kw25cb6l00v5l5dvirkz8jr3sq00h1xgcgrxy";
+        })
+(fetchNuGet {
+        name = "microsoft.visualstudio.sdk.embedinteroptypes";
+        version = "15.0.15";
+        url = "https://www.nuget.org/api/v2/package/microsoft.visualstudio.sdk.embedinteroptypes/15.0.15";
+        sha256 = "0chr3slzzcanwcyd9isx4gichqzmfh4zd3h83piw0r4xsww1wmpd";
+        })
+(fetchNuGet {
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+        version = "4.3.0";
+        url = "https://www.nuget.org/api/v2/package/system.reflection.extensions/4.3.0";
+        sha256 = "02bly8bdc98gs22lqsfx9xicblszr2yan7v2mmw3g7hy6miq5hwq";
+        })
+(fetchNuGet {
+        name = "system.diagnostics.process";
+        version = "4.1.0";
+        url = "https://www.nuget.org/api/v2/package/system.diagnostics.process/4.1.0";
+        sha256 = "061lrcs7xribrmq7kab908lww6kn2xn1w3rdc41q189y0jibl19s";
+        })
+(fetchNuGet {
+        name = "system.diagnostics.process";
+        version = "4.3.0";
+        url = "https://www.nuget.org/api/v2/package/system.diagnostics.process/4.3.0";
+        sha256 = "0g4prsbkygq8m21naqmcp70f24a1ksyix3dihb1r1f71lpi3cfj7";
+        })
+(fetchNuGet {
+        name = "system.security.cryptography.primitives";
+        version = "4.3.0";
+        url = "https://www.nuget.org/api/v2/package/system.security.cryptography.primitives/4.3.0";
+        sha256 = "0pyzncsv48zwly3lw4f2dayqswcfvdwq2nz0dgwmi7fj3pn64wby";
+        })
+(fetchNuGet {
+        name = "system.threading.thread";
+        version = "4.0.0";
+        url = "https://www.nuget.org/api/v2/package/system.threading.thread/4.0.0";
+        sha256 = "1gxxm5fl36pjjpnx1k688dcw8m9l7nmf802nxis6swdaw8k54jzc";
+        })
+(fetchNuGet {
+        name = "system.threading.thread";
+        version = "4.3.0";
+        url = "https://www.nuget.org/api/v2/package/system.threading.thread/4.3.0";
+        sha256 = "0y2xiwdfcph7znm2ysxanrhbqqss6a3shi1z3c779pj2s523mjx4";
+        })
+(fetchNuGet {
+        name = "newtonsoft.json";
+        version = "9.0.1";
+        url = "https://www.nuget.org/api/v2/package/newtonsoft.json/9.0.1";
+        sha256 = "0mcy0i7pnfpqm4pcaiyzzji4g0c8i3a5gjz28rrr28110np8304r";
+        })
+(fetchNuGet {
+        name = "runtime.rhel.7-x64.runtime.native.system.security.cryptography.openssl";
+        version = "4.3.0";
+        url = "https://www.nuget.org/api/v2/package/runtime.rhel.7-x64.runtime.native.system.security.cryptography.openssl/4.3.0";
+        sha256 = "0vhynn79ih7hw7cwjazn87rm9z9fj0rvxgzlab36jybgcpcgphsn";
+        })
+(fetchNuGet {
+        name = "xunit";
+        version = "2.4.1";
+        url = "https://www.nuget.org/api/v2/package/xunit/2.4.1";
+        sha256 = "0xf3kaywpg15flqaqfgywqyychzk15kz0kz34j21rcv78q9ywq20";
+        })
+(fetchNuGet {
+        name = "system.valuetuple";
+        version = "4.3.0";
+        url = "https://www.nuget.org/api/v2/package/system.valuetuple/4.3.0";
+        sha256 = "1227k7fxbxapq7dms4lvwwjdf3pr1jcsmhy2nzzhj6g6hs530hxn";
+        })
+(fetchNuGet {
+        name = "microsoft.netframework.referenceassemblies.net472";
+        version = "1.0.0-alpha-004";
+        url = "https://dotnet.myget.org/F/roslyn-tools/api/v2/package/microsoft.netframework.referenceassemblies.net472/1.0.0-alpha-004";
+        sha256 = "08wa54dm7yskayzxivnwbm8sg1pf6ai8ccr64ixf9lyz3yw6y0nc";
+        })
+(fetchNuGet {
+        name = "system.security.cryptography.algorithms";
+        version = "4.3.0";
+        url = "https://www.nuget.org/api/v2/package/system.security.cryptography.algorithms/4.3.0";
+        sha256 = "03sq183pfl5kp7gkvq77myv7kbpdnq3y0xj7vi4q1kaw54sny0ml";
+        })
+]
diff --git a/nixpkgs/pkgs/development/tools/build-managers/ninja/default.nix b/nixpkgs/pkgs/development/tools/build-managers/ninja/default.nix
new file mode 100644
index 000000000000..ddc61ca86d9c
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/ninja/default.nix
@@ -0,0 +1,49 @@
+{ lib, stdenv, fetchFromGitHub, fetchpatch, python3, buildDocs ? true, asciidoc, docbook_xml_dtd_45, docbook_xsl, libxslt, re2c }:
+
+with lib;
+
+stdenv.mkDerivation rec {
+  pname = "ninja";
+  version = "1.10.2";
+
+  src = fetchFromGitHub {
+    owner = "ninja-build";
+    repo = "ninja";
+    rev = "v${version}";
+    sha256 = "0mspq4mvx41qri2v2zlg2y3znx5gfw6d8s3czbcfpr2218qbpz55";
+  };
+
+  nativeBuildInputs = [ python3 re2c ] ++ optionals buildDocs [ asciidoc docbook_xml_dtd_45 docbook_xsl libxslt.bin ];
+
+  buildPhase = ''
+    python configure.py --bootstrap
+  '' + optionalString buildDocs ''
+    # "./ninja -vn manual" output copied here to support cross compilation.
+    asciidoc -b docbook -d book -o build/manual.xml doc/manual.asciidoc
+    xsltproc --nonet doc/docbook.xsl build/manual.xml > doc/manual.html
+  '';
+
+  installPhase = ''
+    install -Dm555 -t $out/bin ninja
+    install -Dm444 misc/bash-completion $out/share/bash-completion/completions/ninja
+    install -Dm444 misc/zsh-completion $out/share/zsh/site-functions/_ninja
+  '' + optionalString buildDocs ''
+    install -Dm444 -t $out/share/doc/ninja doc/manual.asciidoc doc/manual.html
+  '';
+
+  setupHook = ./setup-hook.sh;
+
+  meta = {
+    description = "Small build system with a focus on speed";
+    longDescription = ''
+      Ninja is a small build system with a focus on speed. It differs from
+      other build systems in two major respects: it is designed to have its
+      input files generated by a higher-level build system, and it is designed
+      to run builds as fast as possible.
+    '';
+    homepage = "https://ninja-build.org/";
+    license = licenses.asl20;
+    platforms = platforms.unix;
+    maintainers = with maintainers; [ thoughtpolice bjornfor orivej ];
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/ninja/setup-hook.sh b/nixpkgs/pkgs/development/tools/build-managers/ninja/setup-hook.sh
new file mode 100644
index 000000000000..7d8087ad1342
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/ninja/setup-hook.sh
@@ -0,0 +1,78 @@
+ninjaBuildPhase() {
+    runHook preBuild
+
+    local buildCores=1
+
+    # Parallel building is enabled by default.
+    if [ "${enableParallelBuilding-1}" ]; then
+        buildCores="$NIX_BUILD_CORES"
+    fi
+
+    local flagsArray=(
+        -j$buildCores -l$NIX_BUILD_CORES
+        $ninjaFlags "${ninjaFlagsArray[@]}"
+    )
+
+    echoCmd 'build flags' "${flagsArray[@]}"
+    ninja "${flagsArray[@]}"
+
+    runHook postBuild
+}
+
+if [ -z "${dontUseNinjaBuild-}" -a -z "${buildPhase-}" ]; then
+    buildPhase=ninjaBuildPhase
+fi
+
+ninjaInstallPhase() {
+    runHook preInstall
+
+    # shellcheck disable=SC2086
+    local flagsArray=(
+        $ninjaFlags "${ninjaFlagsArray[@]}"
+        ${installTargets:-install}
+    )
+
+    echoCmd 'install flags' "${flagsArray[@]}"
+    ninja "${flagsArray[@]}"
+
+    runHook postInstall
+}
+
+if [ -z "${dontUseNinjaInstall-}" -a -z "${installPhase-}" ]; then
+    installPhase=ninjaInstallPhase
+fi
+
+ninjaCheckPhase() {
+    runHook preCheck
+
+    if [ -z "${checkTarget:-}" ]; then
+        if ninja -t query test >/dev/null 2>&1; then
+            checkTarget=test
+        fi
+    fi
+
+    if [ -z "${checkTarget:-}" ]; then
+        echo "no test target found in ninja, doing nothing"
+    else
+        local buildCores=1
+
+        if [ "${enableParallelChecking-1}" ]; then
+            buildCores="$NIX_BUILD_CORES"
+        fi
+
+        local flagsArray=(
+            -j$buildCores -l$NIX_BUILD_CORES
+            $ninjaFlags "${ninjaFlagsArray[@]}"
+            $checkTarget
+        )
+
+        echoCmd 'check flags' "${flagsArray[@]}"
+        ninja "${flagsArray[@]}"
+    fi
+
+    runHook postCheck
+}
+
+if [ -z "${dontUseNinjaCheck-}" -a -z "${checkPhase-}" ]; then
+    checkPhase=ninjaCheckPhase
+fi
diff --git a/nixpkgs/pkgs/development/tools/build-managers/pants/default.nix b/nixpkgs/pkgs/development/tools/build-managers/pants/default.nix
new file mode 100644
index 000000000000..53333c217ba5
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/pants/default.nix
@@ -0,0 +1,41 @@
+{ lib, pythonPackages }:
+
+with lib;
+with pythonPackages;
+
+buildPythonApplication rec {
+  pname = "pantsbuild.pants";
+  version = "1.7.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1d7ff1383287c8e72f2c9855cfef982d362274a64e2707a93c070f988ba80a37";
+  };
+
+  # No tests
+  doCheck = false;
+
+  prePatch = ''
+    sed -E -i "s/'([[:alnum:].-]+)[=><][[:digit:]=><.,]*'/'\\1'/g" setup.py
+    substituteInPlace setup.py --replace "requests[security]<2.19,>=2.5.0" "requests[security]<2.22,>=2.5.0"
+  '';
+
+  # Unnecessary, and causes some really weird behavior around .class files, which
+  # this package bundles. See https://github.com/NixOS/nixpkgs/issues/22520.
+  dontStrip = true;
+
+  propagatedBuildInputs = [
+    twitter-common-collections setproctitle ansicolors packaging pathspec
+    scandir twitter-common-dirutil psutil requests pystache pex docutils
+    markdown pygments twitter-common-confluence fasteners pywatchman
+    futures cffi subprocess32 contextlib2 faulthandler pyopenssl wheel
+  ];
+
+  meta = {
+    description = "A build system for software projects in a variety of languages";
+    homepage    = "https://www.pantsbuild.org/";
+    license     = licenses.asl20;
+    maintainers = with maintainers; [ copumpkin ];
+    broken = true;
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/qbs/default.nix b/nixpkgs/pkgs/development/tools/build-managers/qbs/default.nix
new file mode 100644
index 000000000000..7e46e39b438b
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/qbs/default.nix
@@ -0,0 +1,32 @@
+{ lib, stdenv, fetchFromGitHub, qmake, qtbase, qtscript }:
+
+stdenv.mkDerivation rec {
+  pname = "qbs";
+
+  version = "1.18.0";
+
+  src = fetchFromGitHub {
+    owner = "qbs";
+    repo = "qbs";
+    rev = "v${version}";
+    sha256 = "sha256-W1ky3PWPzfKygY+diBld+BqTAxJvNw9mqw3owcQ6no4=";
+  };
+
+  nativeBuildInputs = [ qmake ];
+
+  dontWrapQtApps = true;
+
+  qmakeFlags = [ "QBS_INSTALL_PREFIX=$(out)" "qbs.pro" ];
+
+  buildInputs = [ qtbase qtscript ];
+
+  enableParallelBuilding = true;
+
+  meta = with lib; {
+    description = "A tool that helps simplify the build process for developing projects across multiple platforms";
+    homepage = "https://wiki.qt.io/Qbs";
+    license = licenses.lgpl3;
+    maintainers = with maintainers; [ expipiplus1 ];
+    platforms = platforms.linux;
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/rake/Gemfile b/nixpkgs/pkgs/development/tools/build-managers/rake/Gemfile
new file mode 100644
index 000000000000..bd1ff6faa65c
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/rake/Gemfile
@@ -0,0 +1,2 @@
+source 'https://rubygems.org'
+gem 'rake'
diff --git a/nixpkgs/pkgs/development/tools/build-managers/rake/Gemfile.lock b/nixpkgs/pkgs/development/tools/build-managers/rake/Gemfile.lock
new file mode 100644
index 000000000000..f89ceae93442
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/rake/Gemfile.lock
@@ -0,0 +1,13 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    rake (12.3.2)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  rake
+
+BUNDLED WITH
+   2.1.4
diff --git a/nixpkgs/pkgs/development/tools/build-managers/rake/default.nix b/nixpkgs/pkgs/development/tools/build-managers/rake/default.nix
new file mode 100644
index 000000000000..d2f0a264ba74
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/rake/default.nix
@@ -0,0 +1,17 @@
+{ lib, bundlerApp, bundlerUpdateScript }:
+
+bundlerApp {
+  pname = "rake";
+  gemdir = ./.;
+  exes = [ "rake" ];
+
+  passthru.updateScript = bundlerUpdateScript "rake";
+
+  meta = with lib; {
+    description = "A software task management and build automation tool";
+    homepage = "https://github.com/ruby/rake";
+    license  = with licenses; mit;
+    maintainers = with maintainers; [ manveru nicknovitski ];
+    platforms = platforms.unix;
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/rake/gemset.nix b/nixpkgs/pkgs/development/tools/build-managers/rake/gemset.nix
new file mode 100644
index 000000000000..534c5efcfb13
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/rake/gemset.nix
@@ -0,0 +1,12 @@
+{
+  rake = {
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "1sy5a7nh6xjdc9yhcw31jji7ssrf9v5806hn95gbrzr998a2ydjn";
+      type = "gem";
+    };
+    version = "12.3.2";
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/rebar/default.nix b/nixpkgs/pkgs/development/tools/build-managers/rebar/default.nix
new file mode 100644
index 000000000000..30c55dbca373
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/rebar/default.nix
@@ -0,0 +1,42 @@
+{ lib, stdenv, fetchurl, erlang }:
+
+
+let
+  version = "2.6.4";
+in
+stdenv.mkDerivation {
+  pname = "rebar";
+  inherit version;
+
+  src = fetchurl {
+    url = "https://github.com/rebar/rebar/archive/${version}.tar.gz";
+    sha256 = "01xxq1f1vrwca00pky2van26hi2hhr05ghfhy71v5cifzax4cwjp";
+  };
+
+  buildInputs = [ erlang ];
+
+  buildPhase = "escript bootstrap";
+  installPhase = ''
+    mkdir -p $out/bin
+    cp rebar $out/bin/rebar
+  '';
+
+  meta = {
+    homepage = "https://github.com/rebar/rebar";
+    description = "Erlang build tool that makes it easy to compile and test Erlang applications, port drivers and releases";
+
+    longDescription = ''
+      rebar is a self-contained Erlang script, so it's easy to
+      distribute or even embed directly in a project. Where possible,
+      rebar uses standard Erlang/OTP conventions for project
+      structures, thus minimizing the amount of build configuration
+      work. rebar also provides dependency management, enabling
+      application writers to easily re-use common libraries from a
+      variety of locations (git, hg, etc).
+      '';
+
+    platforms = lib.platforms.unix;
+    license = lib.licenses.asl20;
+    maintainers = lib.teams.beam.members;
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/rebar3/default.nix b/nixpkgs/pkgs/development/tools/build-managers/rebar3/default.nix
new file mode 100644
index 000000000000..c2b10d823a30
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/rebar3/default.nix
@@ -0,0 +1,137 @@
+{ lib, stdenv, fetchFromGitHub,
+  fetchHex, erlang,
+  tree }:
+
+let
+  version = "3.14.4";
+
+  # Dependencies should match the ones in:
+  # https://github.com/erlang/rebar3/blob/${version}/rebar.lock
+  # `sha256` could also be taken from https://hex.pm - Checksum
+
+  bbmustache = fetchHex {
+    pkg = "bbmustache";
+    version = "1.10.0";
+    sha256 = "1vp27jqnq65a8iqp7j4z8nw9ad29dhky5agmg8aj75dvshzzmvs3";
+  };
+  certifi = fetchHex {
+    pkg = "certifi";
+    version = "2.5.3";
+    sha256 = "040w1scglvqhcvc1ifdnlcyrbwr0smi00w4xi8h03c99775nllgd";
+  };
+  cf = fetchHex {
+    pkg = "cf";
+    version = "0.3.1";
+    sha256 = "0wknz4xkqkhgvlx4vx5619p8m65v7g87lfgsvfy04jrsgm28spii";
+  };
+  cth_readable = fetchHex {
+    pkg = "cth_readable";
+    version = "1.5.0";
+    sha256 = "0z58b6frqdnhyzrmbdf6x78l3izbbh5z5i3am8hqc253r7xwv0dx";
+  };
+  erlware_commons = fetchHex {
+    pkg = "erlware_commons";
+    version = "1.4.0";
+    sha256 = "1rp2vkgzqm6sax7fc13rh9x6qzxsgg718dnv7l0kmarvyifcyphq";
+  };
+  eunit_formatters = fetchHex {
+    pkg = "eunit_formatters";
+    version = "0.5.0";
+    sha256 = "1jb3hzb216r29x2h4pcjwfmx1k81431rgh5v0mp4x5146hhvmj6n";
+  };
+  getopt = fetchHex {
+    pkg = "getopt";
+    version = "1.0.1";
+    sha256 = "53e1ab83b9ceb65c9672d3e7a35b8092e9bdc9b3ee80721471a161c10c59959c";
+  };
+  parse_trans = fetchHex {
+    pkg = "parse_trans";
+    version = "3.3.1";
+    sha256 = "12w8ai6b5s6b4hnvkav7hwxd846zdd74r32f84nkcmjzi1vrbk87";
+  };
+
+  providers = fetchHex {
+    pkg = "providers";
+    version = "1.8.1";
+    sha256 = "183b9128l4af60rs40agqh6kc6db33j4027ad6jajxn4x6nlamz4";
+  };
+
+  relx = fetchHex {
+    pkg = "relx";
+    version = "4.3.0";
+    sha256 = "0h044arh41sr92r1nlg176shavlv7pvw17alwklhszgwlr4hk3kk";
+  };
+
+  ssl_verify_fun = fetchHex {
+    pkg = "ssl_verify_fun";
+    version = "1.1.6";
+    sha256 = "1026l1z1jh25z8bfrhaw0ryk5gprhrpnirq877zqhg253x3x5c5x";
+  };
+in
+stdenv.mkDerivation rec {
+  pname = "rebar3";
+  inherit version erlang;
+
+  # How to obtain `sha256`:
+  # nix-prefetch-url --unpack https://github.com/erlang/rebar3/archive/${version}.tar.gz
+  src = fetchFromGitHub {
+    owner = "erlang";
+    repo = pname;
+    rev = version;
+    sha256 = "09bnqwli93sq1pcz4h88ks7qg7k8yrjy9fd46yyp8xdl7i4irwy2";
+  };
+
+  bootstrapper = ./rebar3-nix-bootstrap;
+
+  buildInputs = [ erlang tree ];
+
+  postPatch = ''
+    mkdir -p _checkouts
+    mkdir -p _build/default/lib/
+
+    cp --no-preserve=mode -R ${bbmustache} _checkouts/bbmustache
+    cp --no-preserve=mode -R ${certifi} _checkouts/certifi
+    cp --no-preserve=mode -R ${cf} _checkouts/cf
+    cp --no-preserve=mode -R ${cth_readable} _checkouts/cth_readable
+    cp --no-preserve=mode -R ${erlware_commons} _checkouts/erlware_commons
+    cp --no-preserve=mode -R ${eunit_formatters} _checkouts/eunit_formatters
+    cp --no-preserve=mode -R ${getopt} _checkouts/getopt
+    cp --no-preserve=mode -R ${parse_trans} _checkouts/parse_trans
+    cp --no-preserve=mode -R ${providers} _checkouts/providers
+    cp --no-preserve=mode -R ${relx} _checkouts/relx
+    cp --no-preserve=mode -R ${ssl_verify_fun} _checkouts/ssl_verify_fun
+
+    # Bootstrap script expects the dependencies in _build/default/lib
+    # TODO: Make it accept checkouts?
+    for i in _checkouts/* ; do
+        ln -s $(pwd)/$i $(pwd)/_build/default/lib/
+    done
+  '';
+
+  buildPhase = ''
+    HOME=. escript bootstrap
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp rebar3 $out/bin/rebar3
+  '';
+
+  meta = {
+    homepage = "https://github.com/rebar/rebar3";
+    description = "Erlang build tool that makes it easy to compile and test Erlang applications, port drivers and releases";
+
+    longDescription = ''
+      rebar is a self-contained Erlang script, so it's easy to distribute or
+      even embed directly in a project. Where possible, rebar uses standard
+      Erlang/OTP conventions for project structures, thus minimizing the amount
+      of build configuration work. rebar also provides dependency management,
+      enabling application writers to easily re-use common libraries from a
+      variety of locations (hex.pm, git, hg, and so on).
+      '';
+
+    platforms = lib.platforms.unix;
+    maintainers = lib.teams.beam.members;
+    license = lib.licenses.asl20;
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/rebar3/rebar3-nix-bootstrap b/nixpkgs/pkgs/development/tools/build-managers/rebar3/rebar3-nix-bootstrap
new file mode 100755
index 000000000000..f1deed1df352
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/rebar3/rebar3-nix-bootstrap
@@ -0,0 +1,267 @@
+#!/usr/bin/env escript
+%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
+%%! -smp enable
+%%% ---------------------------------------------------------------------------
+%%% @doc
+%%% The purpose of this command is to prepare a rebar3 project so that
+%%% rebar3 understands that the dependencies are all already
+%%% installed. If you want a hygienic build on nix then you must run
+%%% this command before running rebar3. I suggest that you add a
+%%% `Makefile` to your project and have the bootstrap command be a
+%%% dependency of the build commands. See the nix documentation for
+%%% more information.
+%%%
+%%% This command designed to have as few dependencies as possible so
+%%% that it can be a dependency of root level packages like rebar3. To
+%%% that end it does many things in a fairly simplistic way. That is
+%%% by design.
+%%%
+%%% ### Assumptions
+%%%
+%%% This command makes the following assumptions:
+%%%
+%%% * It is run in a nix-shell or nix-build environment
+%%% * that all dependencies have been added to the ERL_LIBS
+%%%   Environment Variable
+
+-record(data, {version
+              , debug_info = false
+              , compile_ports
+              , erl_libs
+              , plugins
+              , root
+              , name}).
+
+-define(HEX_REGISTRY_PATH, ".cache/rebar3/hex/default/registry").
+
+main(Args) ->
+    {ok, ArgData} = parse_args(Args),
+    {ok, RequiredData} = gather_required_data_from_the_environment(ArgData),
+    do_the_bootstrap(RequiredData).
+
+-spec do_the_bootstrap(#data{}) -> ok.
+do_the_bootstrap(RequiredData) ->
+    ok = bootstrap_configs(RequiredData),
+    ok = bootstrap_plugins(RequiredData),
+    ok = bootstrap_libs(RequiredData).
+
+%% @doc
+%% Argument parsing is super simple only because we want to keep the
+%% dependencies minimal. For now there can be one entry on the
+%% command line: "debug-info"
+-spec parse_args([string()]) -> #data{}.
+parse_args(Args0) ->
+    PossibleArgs = sets:from_list(["debug-info"]),
+    Args1 = sets:from_list(Args0),
+    Result = sets:subtract(Args1, PossibleArgs),
+    case sets:to_list(Result) of
+        [] ->
+            {ok, #data{debug_info = sets:is_element("debug-info", Args1)}};
+        UnknownArgs ->
+            io:format("Unexpected command line arguments passed in: ~p~n",
+                      [UnknownArgs]),
+            erlang:halt(120)
+    end.
+
+
+-spec bootstrap_configs(#data{}) -> ok.
+bootstrap_configs(RequiredData)->
+    io:format("Boostrapping app and rebar configurations~n"),
+    ok = if_single_app_project_update_app_src_version(RequiredData),
+    ok = if_compile_ports_add_pc_plugin(RequiredData),
+    ok = if_debug_info_add(RequiredData).
+
+-spec bootstrap_plugins(#data{}) -> ok.
+bootstrap_plugins(#data{plugins = Plugins}) ->
+    io:format("Bootstrapping rebar3 plugins~n"),
+    Target = "_build/default/plugins/",
+    Paths = string:tokens(Plugins, " "),
+    CopiableFiles =
+        lists:foldl(fun(Path, Acc) ->
+                            gather_dependency(Path) ++ Acc
+                    end, [], Paths),
+    lists:foreach(fun (Path) ->
+                          ok = link_app(Path, Target)
+                  end, CopiableFiles).
+
+-spec bootstrap_libs(#data{}) -> ok.
+bootstrap_libs(#data{erl_libs = ErlLibs}) ->
+    io:format("Bootstrapping dependent libraries~n"),
+    Target = "_build/default/lib/",
+    Paths = string:tokens(ErlLibs, ":"),
+    CopiableFiles =
+        lists:foldl(fun(Path, Acc) ->
+                            gather_directory_contents(Path) ++ Acc
+                    end, [], Paths),
+    lists:foreach(fun (Path) ->
+                          ok = link_app(Path, Target)
+                  end, CopiableFiles).
+
+-spec gather_dependency(string()) -> [{string(), string()}].
+gather_dependency(Path) ->
+    FullLibrary = filename:join(Path, "lib/erlang/lib/"),
+    case filelib:is_dir(FullLibrary) of
+        true ->
+            gather_directory_contents(FullLibrary);
+        false ->
+            [raw_hex(Path)]
+    end.
+
+-spec raw_hex(string()) -> {string(), string()}.
+raw_hex(Path) ->
+    [_, Name] = re:split(Path, "-hex-source-"),
+    {Path, erlang:binary_to_list(Name)}.
+
+-spec gather_directory_contents(string()) -> [{string(), string()}].
+gather_directory_contents(Path) ->
+    {ok, Names} = file:list_dir(Path),
+    lists:map(fun(AppName) ->
+                 {filename:join(Path, AppName), fixup_app_name(AppName)}
+              end, Names).
+
+%% @doc
+%% Makes a symlink from the directory pointed at by Path to a
+%% directory of the same name in Target. So if we had a Path of
+%% {`foo/bar/baz/bash`, `baz`} and a Target of `faz/foo/foos`, the symlink
+%% would be `faz/foo/foos/baz`.
+-spec link_app({string(), string()}, string()) -> ok.
+link_app({Path, TargetFile}, TargetDir) ->
+    Target = filename:join(TargetDir, TargetFile),
+    make_symlink(Path, Target).
+
+-spec make_symlink(string(), string()) -> ok.
+make_symlink(Path, TargetFile) ->
+    file:delete(TargetFile),
+    ok = filelib:ensure_dir(TargetFile),
+    io:format("Making symlink from ~s to ~s~n", [Path, TargetFile]),
+    ok = file:make_symlink(Path, TargetFile).
+
+%% @doc
+%% This takes an app name in the standard OTP <name>-<version> format
+%% and returns just the app name. Why? Because rebar doesn't
+%% respect OTP conventions in some cases.
+-spec fixup_app_name(string()) -> string().
+fixup_app_name(FileName) ->
+    case string:tokens(FileName, "-") of
+        [Name] -> Name;
+        [Name, _Version] -> Name;
+        [Name, _Version, _Tag] -> Name
+    end.
+
+-spec gather_required_data_from_the_environment(#data{}) -> {ok, #data{}}.
+gather_required_data_from_the_environment(ArgData) ->
+    {ok, ArgData#data{ version = guard_env("version")
+                     , erl_libs = get_env("ERL_LIBS", [])
+                     , plugins = get_env("buildPlugins", [])
+                     , root = code:root_dir()
+                     , name = guard_env("name")
+                     , compile_ports = nix2bool(get_env("compilePorts", ""))}}.
+
+-spec nix2bool(any()) -> boolean().
+nix2bool("1") ->
+    true;
+nix2bool("") ->
+    false.
+
+get_env(Name) ->
+    os:getenv(Name).
+get_env(Name, Def) ->
+    case get_env(Name) of
+        false -> Def;
+        Val ->   Val
+    end.
+
+-spec guard_env(string()) -> string().
+guard_env(Name) ->
+    case get_env(Name) of
+        false ->
+            stderr("Expected Environment variable ~s! Are you sure you are "
+                   "running in a Nix environment? Either a nix-build, "
+                   "nix-shell, etc?~n", [Name]),
+            erlang:halt(1);
+        Variable ->
+            Variable
+    end.
+
+%% @doc
+%% If debug info is set we need to add debug info to the list of compile options
+%%
+-spec if_debug_info_add(#data{}) -> ok.
+if_debug_info_add(#data{debug_info = true}) ->
+    ConfigTerms = add_debug_info(read_rebar_config()),
+    Text = lists:map(fun(Term) -> io_lib:format("~tp.~n", [Term]) end,
+                     ConfigTerms),
+    file:write_file("rebar.config", Text);
+if_debug_info_add(_) ->
+    ok.
+
+-spec add_debug_info([term()]) -> [term()].
+add_debug_info(Config) ->
+    ExistingOpts = case lists:keysearch(erl_opts, 1, Config) of
+                       {value, {erl_opts, ExistingOptsList}} -> ExistingOptsList;
+                       _ -> []
+                   end,
+    case lists:member(debug_info, ExistingOpts) of
+        true ->
+            Config;
+        false ->
+            lists:keystore(erl_opts, 1, Config,
+                           {erl_opts, [debug_info | ExistingOpts]})
+    end.
+
+
+%% @doc
+%% If the compile ports flag is set, rewrite the rebar config to
+%% include the 'pc' plugin.
+-spec if_compile_ports_add_pc_plugin(#data{}) -> ok.
+if_compile_ports_add_pc_plugin(#data{compile_ports = true}) ->
+    ConfigTerms = add_pc_to_plugins(read_rebar_config()),
+    Text = lists:map(fun(Term) -> io_lib:format("~tp.~n", [Term]) end,
+                     ConfigTerms),
+    file:write_file("rebar.config", Text);
+if_compile_ports_add_pc_plugin(_) ->
+    ok.
+
+-spec add_pc_to_plugins([term()]) -> [term()].
+add_pc_to_plugins(Config) ->
+    PluginList = case lists:keysearch(plugins, 1, Config) of
+                     {value, {plugins, ExistingPluginList}} -> ExistingPluginList;
+                     _ -> []
+                 end,
+    lists:keystore(plugins, 1, Config, {plugins, [pc | PluginList]}).
+
+-spec read_rebar_config() -> [term()].
+read_rebar_config() ->
+    case file:consult("rebar.config") of
+        {ok, Terms} ->
+            Terms;
+        _ ->
+            stderr("Unable to read rebar config!", []),
+            erlang:halt(1)
+    end.
+
+
+-spec if_single_app_project_update_app_src_version(#data{}) -> ok.
+if_single_app_project_update_app_src_version(#data{name = Name,
+                                                   version = Version}) ->
+    SrcFile = filename:join("src",
+                            lists:concat([Name, ".app.src"])),
+
+    case filelib:is_file(SrcFile) of
+        true ->
+            update_app_src_with_version(SrcFile, Version);
+        false ->
+            ok
+    end.
+
+-spec update_app_src_with_version(string(), string()) -> ok.
+update_app_src_with_version(SrcFile, Version) ->
+    {ok, [{application, Name, Details}]} = file:consult(SrcFile),
+    NewDetails = lists:keyreplace(vsn, 1, Details, {vsn, Version}),
+    ok = file:write_file(SrcFile, io_lib:fwrite("~p.\n", [{application, Name, NewDetails}])).
+
+%% @doc
+%% Write the result of the format string out to stderr.
+-spec stderr(string(), [term()]) -> ok.
+stderr(FormatStr, Args) ->
+    io:put_chars(standard_error, io_lib:format(FormatStr, Args)).
diff --git a/nixpkgs/pkgs/development/tools/build-managers/redo-apenwarr/default.nix b/nixpkgs/pkgs/development/tools/build-managers/redo-apenwarr/default.nix
new file mode 100644
index 000000000000..638f10f01873
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/redo-apenwarr/default.nix
@@ -0,0 +1,73 @@
+{ stdenv, lib, python3, fetchFromGitHub, which, findutils, coreutils
+, perl, installShellFiles
+, doCheck ? true
+}: stdenv.mkDerivation rec {
+
+  pname = "redo-apenwarr";
+  version = "0.42c";
+
+  src = fetchFromGitHub rec {
+    owner = "apenwarr";
+    repo = "redo";
+    rev = "${repo}-${version}";
+    sha256 = "0kc2gag1n5583195gs38gjm8mb7in9y70c07fxibsay19pvvb8iw";
+  };
+
+  postPatch = ''
+
+    patchShebangs minimal/do
+
+  '' + lib.optionalString doCheck ''
+    unset CC CXX
+
+    substituteInPlace minimal/do.test \
+      --replace "/bin/pwd" "${coreutils}/bin/pwd"
+
+    substituteInPlace t/105-sympath/all.do \
+      --replace "/bin/pwd" "${coreutils}/bin/pwd"
+
+    substituteInPlace t/all.do \
+      --replace "/bin/ls" "ls"
+
+    substituteInPlace t/110-compile/hello.o.do \
+      --replace "/usr/include" "${lib.getDev stdenv.cc.libc}/include"
+
+    substituteInPlace t/200-shell/nonshelltest.do \
+      --replace "/usr/bin/env perl" "${perl}/bin/perl"
+
+  '';
+
+  inherit doCheck;
+
+  checkTarget = "test";
+
+  outputs = [ "out" "man" ];
+
+  installFlags = [
+    "PREFIX=$(out)"
+    "DESTDIR=/"
+  ];
+
+  nativeBuildInputs = [
+    python3
+    (with python3.pkgs; [ beautifulsoup4 markdown ])
+    which
+    findutils
+    installShellFiles
+  ];
+
+  postInstall = ''
+    installShellCompletion --bash contrib/bash_completion.d/redo
+  '';
+
+  meta = with lib; {
+    description = "Smaller, easier, more powerful, and more reliable than make. An implementation of djb's redo";
+    homepage = "https://github.com/apenwarr/redo";
+    maintainers = with maintainers; [
+      andrewchambers
+      ck3d
+    ];
+    license = licenses.asl20;
+    platforms = python3.meta.platforms;
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/redo-c/Makefile b/nixpkgs/pkgs/development/tools/build-managers/redo-c/Makefile
new file mode 100644
index 000000000000..f2c43cc5003c
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/redo-c/Makefile
@@ -0,0 +1,10 @@
+CFLAGS=-Os
+
+all: redo links
+
+links:
+	sh links.do
+
+install:
+	mkdir -p "$(out)/bin"
+	cp --no-dereference redo redo-* "$(out)/bin"
diff --git a/nixpkgs/pkgs/development/tools/build-managers/redo-c/default.nix b/nixpkgs/pkgs/development/tools/build-managers/redo-c/default.nix
new file mode 100644
index 000000000000..40708b7877a9
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/redo-c/default.nix
@@ -0,0 +1,24 @@
+{ lib, stdenv, fetchFromGitHub }:
+stdenv.mkDerivation rec {
+  pname = "redo-c";
+  version = "0.2";
+
+  src = fetchFromGitHub {
+    owner = "leahneukirchen";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "11wc2sgw1ssdm83cjdc6ndnp1bv5mzhbw7njw47mk7ri1ic1x51b";
+  };
+
+  postPatch = ''
+    cp '${./Makefile}' Makefile
+  '';
+
+  meta = with lib; {
+    description = "An implementation of the redo build system in portable C with zero dependencies";
+    homepage = "https://github.com/leahneukirchen/redo-c";
+    license = licenses.cc0;
+    platforms = platforms.all;
+    maintainers = with maintainers; [ ck3d ];
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/redo-sh/default.nix b/nixpkgs/pkgs/development/tools/build-managers/redo-sh/default.nix
new file mode 100644
index 000000000000..093a825723c0
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/redo-sh/default.nix
@@ -0,0 +1,31 @@
+{ lib, stdenv, fetchurl, makeWrapper, coreutils }:
+
+stdenv.mkDerivation {
+  version = "4.0.4";
+  pname = "redo-sh";
+
+  src = fetchurl {
+    url = "http://news.dieweltistgarnichtso.net/bin/archives/redo-sh.tar.gz";
+    sha256 = "0d3hz3vy5qmjr9r4f8a5cx9hikpzs8h8f0fsl3dpbialf4wck24g";
+  };
+
+  nativeBuildInputs = [ makeWrapper ];
+
+  sourceRoot = ".";
+  installPhase = ''
+    mkdir -p "$out/share"
+    mv man "$out/share"
+    mv bin "$out"
+    for p in $out/bin/*; do
+      wrapProgram "$p" --prefix PATH : "$out/bin:${coreutils}/bin"
+    done
+  '';
+
+  meta = with lib; {
+    description = "Redo implementation in Bourne Shell";
+    homepage = "http://news.dieweltistgarnichtso.net/bin/redo-sh.html";
+    license  = licenses.agpl3;
+    platforms = platforms.unix;
+    maintainers = with maintainers; [ sternenseemann ];
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/redo/default.nix b/nixpkgs/pkgs/development/tools/build-managers/redo/default.nix
new file mode 100644
index 000000000000..48fbffc39406
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/redo/default.nix
@@ -0,0 +1,28 @@
+{lib, stdenv, fetchurl, perl }:
+
+stdenv.mkDerivation rec {
+  name = "redo-1.4";
+  src = fetchurl {
+    url = "https://jdebp.eu./Repository/freebsd/${name}.tar.gz";
+    sha256 = "1c8gr5h77v4fw78zkhbm9z9adqs3kd7xvxwnmci2zvlf4bqqk4jv";
+  };
+
+  nativeBuildInputs = [ perl /* for pod2man */ ];
+
+  sourceRoot = ".";
+
+  buildPhase = ''
+    ./package/compile
+  '';
+  installPhase = ''
+    ./package/export $out/
+  '';
+
+  meta = {
+    homepage = "https://jdebp.eu./Softwares/redo/";
+    description = "A system for building target files from source files";
+    license = lib.licenses.bsd2;
+    maintainers = [ lib.maintainers.vrthra ];
+    platforms = lib.platforms.unix;
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/remake/default.nix b/nixpkgs/pkgs/development/tools/build-managers/remake/default.nix
new file mode 100644
index 000000000000..f61a7e774583
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/remake/default.nix
@@ -0,0 +1,27 @@
+{ lib, stdenv, fetchurl, readline }:
+
+stdenv.mkDerivation rec {
+  pname = "remake";
+  remakeVersion = "4.1";
+  dbgVersion = "1.1";
+  version = "${remakeVersion}+dbg-${dbgVersion}";
+
+  src = fetchurl {
+    url = "mirror://sourceforge/project/bashdb/remake/${version}/remake-${remakeVersion}+dbg${dbgVersion}.tar.bz2";
+    sha256 = "1zi16pl7sqn1aa8b7zqm9qnd9vjqyfywqm8s6iap4clf86l7kss2";
+  };
+
+  patches = [
+    ./glibc-2.27-glob.patch
+  ];
+
+  buildInputs = [ readline ];
+
+  meta = {
+    homepage = "http://bashdb.sourceforge.net/remake/";
+    license = lib.licenses.gpl3;
+    description = "GNU Make with comprehensible tracing and a debugger";
+    platforms = with lib.platforms; linux ++ darwin;
+    maintainers = with lib.maintainers; [ bjornfor ];
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/remake/glibc-2.27-glob.patch b/nixpkgs/pkgs/development/tools/build-managers/remake/glibc-2.27-glob.patch
new file mode 100644
index 000000000000..ef876e2fb237
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/remake/glibc-2.27-glob.patch
@@ -0,0 +1,34 @@
+diff --git a/glob/glob.c b/glob/glob.c
+index f3911bcd861..6cb76e8e162 100644
+--- a/glob/glob.c
++++ b/glob/glob.c
+@@ -208,29 +208,8 @@ my_realloc (p, n)
+ #endif /* __GNU_LIBRARY__ || __DJGPP__ */
+ 
+ 
+-#if !defined __alloca && !defined __GNU_LIBRARY__
+-
+-# ifdef	__GNUC__
+-#  undef alloca
+-#  define alloca(n)	__builtin_alloca (n)
+-# else	/* Not GCC.  */
+-#  ifdef HAVE_ALLOCA_H
+-#   include <alloca.h>
+-#  else	/* Not HAVE_ALLOCA_H.  */
+-#   ifndef _AIX
+-#    ifdef WINDOWS32
+-#     include <malloc.h>
+-#    else
+-extern char *alloca ();
+-#    endif /* WINDOWS32 */
+-#   endif /* Not _AIX.  */
+-#  endif /* sparc or HAVE_ALLOCA_H.  */
+-# endif	/* GCC.  */
+-
+ # define __alloca	alloca
+ 
+-#endif
+-
+ #ifndef __GNU_LIBRARY__
+ # define __stat stat
+ # ifdef STAT_MACROS_BROKEN
diff --git a/nixpkgs/pkgs/development/tools/build-managers/rocm-cmake/default.nix b/nixpkgs/pkgs/development/tools/build-managers/rocm-cmake/default.nix
new file mode 100644
index 000000000000..16ea0dc28318
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/rocm-cmake/default.nix
@@ -0,0 +1,23 @@
+{ lib, stdenv, fetchFromGitHub, cmake }:
+
+stdenv.mkDerivation rec {
+  pname = "rocm-cmake";
+  version = "4.1.0";
+
+  src = fetchFromGitHub {
+    owner = "RadeonOpenCompute";
+    repo = "rocm-cmake";
+    rev = "rocm-${version}";
+    hash = "sha256-uK060F7d7/pTCNbGqdKCzxgPrPPbGjNwuUOt176z7EM=";
+  };
+
+  nativeBuildInputs = [ cmake ];
+
+  meta = with lib; {
+    description = "CMake modules for common build tasks for the ROCm stack";
+    homepage = "https://github.com/RadeonOpenCompute/rocm-cmake";
+    license = licenses.mit;
+    maintainers = with maintainers; [ danieldk ];
+    platforms = platforms.unix;
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/samurai/default.nix b/nixpkgs/pkgs/development/tools/build-managers/samurai/default.nix
new file mode 100644
index 000000000000..1fb4206d5cec
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/samurai/default.nix
@@ -0,0 +1,23 @@
+{ lib, stdenv, fetchFromGitHub }:
+
+stdenv.mkDerivation rec {
+  pname = "samurai";
+  version = "1.2";
+
+  src = fetchFromGitHub {
+    owner = "michaelforney";
+    repo = pname;
+    rev = version;
+    sha256 = "sha256-RPY3MFlnSDBZ5LOkdWnMiR/CZIBdqIFo9uLU+SAKPBI=";
+  };
+
+  makeFlags = [ "DESTDIR=" "PREFIX=${placeholder "out"}" ];
+
+  meta = with lib; {
+    description = "ninja-compatible build tool written in C";
+    homepage = "https://github.com/michaelforney/samurai";
+    license = with licenses; [ mit asl20 ]; # see LICENSE
+    maintainers = with maintainers; [ dtzWill ];
+  };
+}
+
diff --git a/nixpkgs/pkgs/development/tools/build-managers/sbt-extras/default.nix b/nixpkgs/pkgs/development/tools/build-managers/sbt-extras/default.nix
new file mode 100644
index 000000000000..b49e5f7558a9
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/sbt-extras/default.nix
@@ -0,0 +1,77 @@
+{ lib, stdenv, fetchFromGitHub, which, curl, makeWrapper, jdk, writeScript
+, common-updater-scripts, cacert, git, nixfmt, nix, jq, coreutils, gnused }:
+
+stdenv.mkDerivation rec {
+  pname = "sbt-extras";
+  rev = "a76f1f15e6ec39d886f8bf07d5bdfaf70cdc62d8";
+  version = "2021-04-06";
+
+  src = fetchFromGitHub {
+    owner = "paulp";
+    repo = "sbt-extras";
+    inherit rev;
+    sha256 = "0zmhn8nvzrbw047g5z4q2slp0wdg6pvfh2pqnpwcq1hscf7dvz8f";
+  };
+
+  dontBuild = true;
+
+  nativeBuildInputs = [ makeWrapper ];
+
+  installPhase = ''
+    runHook preInstall
+
+    mkdir -p $out/bin
+
+    substituteInPlace bin/sbt --replace 'declare java_cmd="java"' 'declare java_cmd="${jdk}/bin/java"'
+
+    install bin/sbt $out/bin
+
+    wrapProgram $out/bin/sbt --prefix PATH : ${lib.makeBinPath [ which curl ]}
+
+    runHook postInstall
+  '';
+
+  doInstallCheck = true;
+  installCheckPhase = ''
+    $out/bin/sbt -h >/dev/null
+  '';
+
+  passthru.updateScript = writeScript "update.sh" ''
+     #!${stdenv.shell}
+     set -xo errexit
+     PATH=${
+       lib.makeBinPath [
+         common-updater-scripts
+         curl
+         cacert
+         git
+         nixfmt
+         nix
+         jq
+         coreutils
+         gnused
+       ]
+     }
+    oldVersion="$(nix-instantiate --eval -E "with import ./. {}; lib.getVersion ${pname}" | tr -d '"')"
+     latestSha="$(curl -L -s https://api.github.com/repos/paulp/sbt-extras/commits\?sha\=master\&since\=$oldVersion | jq -r '.[0].sha')"
+    if [ ! "null" = "$latestSha" ]; then
+       nixpkgs="$(git rev-parse --show-toplevel)"
+       default_nix="$nixpkgs/pkgs/development/tools/build-managers/sbt-extras/default.nix"
+       latestDate="$(curl -L -s https://api.github.com/repos/paulp/sbt-extras/commits/$latestSha | jq '.commit.committer.date' | sed 's|"\(.*\)T.*|\1|g')"
+       update-source-version ${pname} "$latestSha" --version-key=rev
+       update-source-version ${pname} "$latestDate" --ignore-same-hash
+       nixfmt "$default_nix"
+     else
+       echo "${pname} is already up-to-date"
+     fi
+  '';
+
+  meta = {
+    description =
+      "A more featureful runner for sbt, the simple/scala/standard build tool";
+    homepage = "https://github.com/paulp/sbt-extras";
+    license = lib.licenses.bsd3;
+    maintainers = with lib.maintainers; [ nequissimus puffnfresh ];
+    platforms = lib.platforms.unix;
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/sbt/default.nix b/nixpkgs/pkgs/development/tools/build-managers/sbt/default.nix
new file mode 100644
index 000000000000..00e70c46b2a9
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/sbt/default.nix
@@ -0,0 +1,46 @@
+{ lib
+, stdenv
+, fetchurl
+, jre
+, autoPatchelfHook
+, zlib
+}:
+
+stdenv.mkDerivation rec {
+  pname = "sbt";
+  version = "1.5.0";
+
+  src = fetchurl {
+    url = "https://github.com/sbt/sbt/releases/download/v${version}/sbt-${version}.tgz";
+    sha256 = "1dj241cj3v8kzqnz5s499rijpl7wv4rw171swqnc0xza90513pxa";
+  };
+
+  postPatch = ''
+    echo -java-home ${jre.home} >>conf/sbtopts
+  '';
+
+  nativeBuildInputs = lib.optionals stdenv.isLinux [ autoPatchelfHook ];
+
+  buildInputs = lib.optionals stdenv.isLinux [ zlib ];
+
+  installPhase = ''
+    runHook preInstall
+
+    mkdir -p $out/share/sbt $out/bin
+    cp -ra . $out/share/sbt
+    ln -sT ../share/sbt/bin/sbt $out/bin/sbt
+    ln -sT ../share/sbt/bin/sbtn-x86_64-${
+      if (stdenv.isDarwin) then "apple-darwin" else "pc-linux"
+    } $out/bin/sbtn
+
+    runHook postInstall
+  '';
+
+  meta = with lib; {
+    homepage = "https://www.scala-sbt.org/";
+    license = licenses.bsd3;
+    description = "A build tool for Scala, Java and more";
+    maintainers = with maintainers; [ nequissimus ];
+    platforms = platforms.unix;
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/sbt/scala-native.nix b/nixpkgs/pkgs/development/tools/build-managers/sbt/scala-native.nix
new file mode 100644
index 000000000000..70038ed2d3a4
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/sbt/scala-native.nix
@@ -0,0 +1,18 @@
+{ lib, sbt, makeWrapper, boehmgc, libunwind, re2, llvmPackages, zlib }:
+
+sbt.overrideDerivation(old: {
+  nativeBuildInputs = [ makeWrapper ];
+
+  version = "0.13.16";
+
+  sha256 = "033nvklclvbirhpsiy28d3ccmbm26zcs9vb7j8jndsc1ln09awi2";
+
+  postFixup = ''
+    wrapProgram $out/bin/sbt \
+      --set CLANG_PATH      "${llvmPackages.clang}/bin/clang" \
+      --set CLANGPP_PATH    "${llvmPackages.clang}/bin/clang" \
+      --set CPATH           "${lib.makeSearchPathOutput "dev" "include" [ re2 zlib boehmgc libunwind llvmPackages.libcxxabi llvmPackages.libcxx ]}/c++/v1" \
+      --set LIBRARY_PATH    "${lib.makeLibraryPath [ re2 zlib boehmgc libunwind llvmPackages.libcxxabi llvmPackages.libcxx ]}" \
+      --set NIX_CFLAGS_LINK "-lc++abi -lc++"
+  '';
+})
diff --git a/nixpkgs/pkgs/development/tools/build-managers/scons/common.nix b/nixpkgs/pkgs/development/tools/build-managers/scons/common.nix
new file mode 100644
index 000000000000..8b5b608fdf39
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/scons/common.nix
@@ -0,0 +1,48 @@
+{ version, sha256 }:
+
+{ fetchurl, python3Packages, lib }:
+
+python3Packages.buildPythonApplication rec {
+  pname = "scons";
+  inherit version;
+
+  src = fetchurl {
+    url = "mirror://sourceforge/scons/${pname}-${version}.tar.gz";
+    inherit sha256;
+  };
+
+  setupHook = ./setup-hook.sh;
+
+  postPatch = lib.optionalString (lib.versionAtLeast version "4.0.0") ''
+    substituteInPlace setup.cfg \
+      --replace "build/dist" "dist"
+  '' + lib.optionalString (lib.versionAtLeast version "4.1.0") ''
+    substituteInPlace setup.cfg \
+      --replace "build/doc/man/" ""
+  '';
+
+  # The release tarballs don't contain any tests (runtest.py and test/*):
+  doCheck = lib.versionOlder version "4.0.0";
+
+  postInstall = lib.optionalString (lib.versionAtLeast version "4.1.0") ''
+    mkdir -p "$out/share/man/man1"
+    mv "$out/"*.1 "$out/share/man/man1/"
+  '';
+
+  meta = with lib; {
+    description = "An improved, cross-platform substitute for Make";
+    longDescription = ''
+      SCons is an Open Source software construction tool. Think of
+      SCons as an improved, cross-platform substitute for the classic
+      Make utility with integrated functionality similar to
+      autoconf/automake and compiler caches such as ccache. In short,
+      SCons is an easier, more reliable and faster way to build
+      software.
+    '';
+    homepage = "https://scons.org/";
+    changelog = "https://raw.githubusercontent.com/SConsProject/scons/rel_${version}/src/CHANGES.txt";
+    license = licenses.mit;
+    platforms = platforms.all;
+    maintainers = [ maintainers.primeos ];
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/scons/default.nix b/nixpkgs/pkgs/development/tools/build-managers/scons/default.nix
new file mode 100644
index 000000000000..4b07eb0501d8
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/scons/default.nix
@@ -0,0 +1,18 @@
+{ callPackage, python2Packages }:
+
+let
+  mkScons = args: callPackage (import ./common.nix args) { };
+in {
+  scons_3_0_1 = (mkScons {
+    version = "3.0.1";
+    sha256 = "0wzid419mlwqw9llrg8gsx4nkzhqy16m4m40r0xnh6cwscw5wir4";
+  }).override { python3Packages = python2Packages; };
+  scons_3_1_2 = (mkScons {
+    version = "3.1.2";
+    sha256 = "1yzq2gg9zwz9rvfn42v5jzl3g4qf1khhny6zfbi2hib55zvg60bq";
+  }).override { python3Packages = python2Packages; };
+  scons_latest = mkScons {
+    version = "4.1.0";
+    sha256 = "11axk03142ziax6i3wwy9qpqp7r3i7h5jg9y2xzph9i15rv8vlkj";
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/scons/setup-hook.sh b/nixpkgs/pkgs/development/tools/build-managers/scons/setup-hook.sh
new file mode 100644
index 000000000000..0b908f68286b
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/scons/setup-hook.sh
@@ -0,0 +1,84 @@
+sconsBuildPhase() {
+    runHook preBuild
+
+    if [ -n "$prefix" ]; then
+        mkdir -p "$prefix"
+    fi
+
+    if [ -z "${dontAddPrefix:-}" ] && [ -n "$prefix" ]; then
+        buildFlags="${prefixKey:-prefix=}$prefix $buildFlags"
+    fi
+
+    local flagsArray=(
+      ${enableParallelBuilding:+-j${NIX_BUILD_CORES}}
+      $sconsFlags ${sconsFlagsArray[@]}
+      $buildFlags ${buildFlagsArray[@]}
+    )
+
+    echoCmd 'build flags' "${flagsArray[@]}"
+    scons "${flagsArray[@]}"
+
+    runHook postBuild
+}
+
+sconsInstallPhase() {
+    runHook preInstall
+
+    if [ -n "$prefix" ]; then
+        mkdir -p "$prefix"
+    fi
+
+    if [ -z "${dontAddPrefix:-}" ] && [ -n "$prefix" ]; then
+        installFlags="${prefixKey:-prefix=}$prefix $installFlags"
+    fi
+
+    local flagsArray=(
+        $sconsFlags ${sconsFlagsArray[@]}
+        $installFlags ${installFlagsArray[@]}
+        ${installTargets:-install}
+    )
+
+    echoCmd 'install flags' "${flagsArray[@]}"
+    scons "${flagsArray[@]}"
+
+    runHook postInstall
+}
+
+sconsCheckPhase() {
+    runHook preCheck
+
+    if [ -z "${checkTarget:-}" ]; then
+        if scons -n check >/dev/null 2>&1; then
+            checkTarget=check
+        elif scons -n test >/dev/null 2>&1; then
+            checkTarget=test
+        fi
+    fi
+
+    if [ -z "${checkTarget:-}" ]; then
+        echo "no check/test target found, doing nothing"
+    else
+        local flagsArray=(
+            ${enableParallelChecking:+-j${NIX_BUILD_CORES}}
+            $sconsFlags ${sconsFlagsArray[@]}
+            ${checkFlagsArray[@]}
+        )
+
+        echoCmd 'check flags' "${flagsArray[@]}"
+        scons "${flagsArray[@]}"
+    fi
+
+    runHook postCheck
+}
+
+if [ -z "${buildPhase-}" ]; then
+    buildPhase=sconsBuildPhase
+fi
+
+if [ -z "${dontUseSconsInstall-}" -a -z "${installPhase-}" ]; then
+    installPhase=sconsInstallPhase
+fi
+
+if [ -z "${checkPhase-}" ]; then
+    checkPhase=sconsCheckPhase
+fi
diff --git a/nixpkgs/pkgs/development/tools/build-managers/shards/default.nix b/nixpkgs/pkgs/development/tools/build-managers/shards/default.nix
new file mode 100644
index 000000000000..16b2967e632d
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/shards/default.nix
@@ -0,0 +1,53 @@
+{ lib
+, fetchFromGitHub
+, crystal_0_34
+, crystal_0_36
+}:
+let
+  generic =
+    { version, sha256, crystal }:
+
+    crystal.buildCrystalPackage {
+      pname = "shards";
+      inherit version;
+
+      src = fetchFromGitHub {
+        owner = "crystal-lang";
+        repo = "shards";
+        rev = "v${version}";
+        inherit sha256;
+      };
+
+      # we cannot use `make` or `shards` here as it would introduce a cyclical dependency
+      format = "crystal";
+      shardsFile = ./shards.nix;
+      crystalBinaries.shards.src = "./src/shards.cr";
+
+      # tries to execute git which fails spectacularly
+      doCheck = false;
+
+      meta = with lib; {
+        description = "Dependency manager for the Crystal language";
+        license = licenses.asl20;
+        maintainers = with maintainers; [ peterhoeg ];
+        inherit (crystal.meta) homepage platforms;
+      };
+    };
+
+in
+rec {
+  # needed for anything that requires the old v1 shards format
+  shards_0_11 = generic {
+    version = "0.11.1";
+    sha256 = "05qnhc23xbmicdl4fwyxfpcvd8jq4inzh6v7jsjjw4n76vzb1f71";
+    crystal = crystal_0_34;
+  };
+
+  shards_0_14 = generic {
+    version = "0.14.1";
+    sha256 = "sha256-/C6whh5RbTBkFWqpn0GqyVe0opbrklm8xPv5MIG99VU=";
+    crystal = crystal_0_36;
+  };
+
+  shards = shards_0_14;
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/shards/shards.nix b/nixpkgs/pkgs/development/tools/build-managers/shards/shards.nix
new file mode 100644
index 000000000000..95250acf1945
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/shards/shards.nix
@@ -0,0 +1,8 @@
+{
+  molinillo = {
+    owner = "crystal-lang";
+    repo = "crystal-molinillo";
+    rev = "v0.2.0";
+    sha256 = "0pzi8pbrjn03zgk3kbha2kqqq0crmr8gy98dr05kisafvbghzwnh";
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/tup/default.nix b/nixpkgs/pkgs/development/tools/build-managers/tup/default.nix
new file mode 100644
index 000000000000..f0e6efdca3e9
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/tup/default.nix
@@ -0,0 +1,55 @@
+{ lib, stdenv, fetchFromGitHub, fuse3, pkg-config, pcre }:
+
+stdenv.mkDerivation rec {
+  pname = "tup";
+  version = "0.7.10";
+  outputs = [ "bin" "man" "out" ];
+
+  src = fetchFromGitHub {
+    owner = "gittup";
+    repo = "tup";
+    rev = "v${version}";
+    sha256 = "1qd07h4wi0743l7z2vybfvhwp61g2p2pc5qhl40672ryl24nvd1d";
+  };
+
+  nativeBuildInputs = [ pkg-config ];
+  buildInputs = [ fuse3 pcre ];
+
+  configurePhase = ''
+    sed -i 's/`git describe`/v${version}/g' src/tup/link.sh
+    sed -i 's/pcre-confg/pkg-config pcre/g' Tupfile Tuprules.tup
+  '';
+
+  # Regular tup builds require fusermount to have suid, which nix cannot
+  # currently provide in a build environment, so we bootstrap and use 'tup
+  # generate' instead
+  buildPhase = ''
+    ./build.sh
+    ./build/tup init
+    ./build/tup generate script.sh
+    ./script.sh
+  '';
+
+  installPhase = ''
+    install -D tup -t $bin/bin/
+    install -D tup.1 -t $man/share/man/man1/
+  '';
+
+  setupHook = ./setup-hook.sh;
+
+  meta = with lib; {
+    description = "A fast, file-based build system";
+    longDescription = ''
+      Tup is a file-based build system for Linux, OSX, and Windows. It inputs a list
+      of file changes and a directed acyclic graph (DAG), then processes the DAG to
+      execute the appropriate commands required to update dependent files. Updates are
+      performed with very little overhead since tup implements powerful build
+      algorithms to avoid doing unnecessary work. This means you can stay focused on
+      your project rather than on your build system.
+    '';
+    homepage = "http://gittup.org/tup/";
+    license = licenses.gpl2;
+    maintainers = with maintainers; [ ehmry ];
+    platforms = platforms.linux ++ platforms.darwin;
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/tup/setup-hook.sh b/nixpkgs/pkgs/development/tools/build-managers/tup/setup-hook.sh
new file mode 100644
index 000000000000..5bf64ae59d35
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/tup/setup-hook.sh
@@ -0,0 +1,44 @@
+#!/bin/sh
+
+tupConfigurePhase() {
+	runHook preConfigure
+
+	echo -n CONFIG_TUP_ARCH= >> tup.config
+	case "$system" in
+	"i686-*")      echo i386 >> tup.config;;
+	"x86_64-*")    echo x86_64 >> tup.config;;
+	"powerpc-*")   echo powerpc >> tup.config;;
+	"powerpc64-*") echo powerpc64 >> tup.config;;
+	"ia64-*")      echo ia64 >> tup.config;;
+	"alpha-*")     echo alpha >> tup.config;;
+	"sparc-*")     echo sparc >> tup.config;;
+	"aarch64-*")   echo arm64 >> tup.config;;
+	"arm*")        echo arm >> tup.config;;
+	esac
+
+	echo "${tupConfig-}" >> tup.config
+
+	tup init
+	tup generate tupBuild.sh
+
+	runHook postConfigure
+}
+
+if [ -z "${dontUseTupConfigure-}" -a -z "${configurePhase-}" ]; then
+    configurePhase=tupConfigurePhase
+fi
+
+
+tupBuildPhase() {
+	runHook preBuild
+
+	pushd .
+	. tupBuild.sh
+	popd
+
+	runHook postBuild
+}
+
+if [ -z "${dontUseTupBuild-}" -a -z "${buildPhase-}" ]; then
+    buildPhase=tupBuildPhase
+fi
diff --git a/nixpkgs/pkgs/development/tools/build-managers/waf/default.nix b/nixpkgs/pkgs/development/tools/build-managers/waf/default.nix
new file mode 100644
index 000000000000..4d4bb6957eaa
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/waf/default.nix
@@ -0,0 +1,39 @@
+{ lib, stdenv, fetchFromGitLab, python, ensureNewerSourcesForZipFilesHook
+# optional list of extra waf tools, e.g. `[ "doxygen" "pytest" ]`
+, withTools ? null
+}:
+let
+  wafToolsArg = with lib.strings;
+    optionalString (!isNull withTools) " --tools=\"${concatStringsSep "," withTools}\"";
+in
+stdenv.mkDerivation rec {
+  pname = "waf";
+  version = "2.0.22";
+
+  src = fetchFromGitLab {
+    owner = "ita1024";
+    repo = "waf";
+    rev = "${pname}-${version}";
+    sha256 = "sha256-WGGyhvQdFYmC0NOA5VVqCRMF1fvfPcTI42x1nHvz0W0=";
+  };
+
+  buildInputs = [ python ensureNewerSourcesForZipFilesHook ];
+
+  configurePhase = ''
+    python waf-light configure
+  '';
+  buildPhase = ''
+    python waf-light build${wafToolsArg}
+  '';
+  installPhase = ''
+    install -D waf $out/bin/waf
+  '';
+
+  meta = with lib; {
+    description = "Meta build system";
+    homepage    = "https://waf.io";
+    license     = licenses.bsd3;
+    platforms   = platforms.all;
+    maintainers = with maintainers; [ vrthra ];
+  };
+}
diff --git a/nixpkgs/pkgs/development/tools/build-managers/wafHook/default.nix b/nixpkgs/pkgs/development/tools/build-managers/wafHook/default.nix
new file mode 100644
index 000000000000..2131caede3c8
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/wafHook/default.nix
@@ -0,0 +1,9 @@
+{ lib, stdenv, pkgs, makeSetupHook, waf }:
+
+makeSetupHook {
+  substitutions = {
+    inherit waf;
+    crossFlags = lib.optionalString (stdenv.hostPlatform.system != stdenv.targetPlatform.system)
+      ''--cross-compile "--cross-execute=${stdenv.targetPlatform.emulator pkgs}"'';
+  };
+} ./setup-hook.sh
diff --git a/nixpkgs/pkgs/development/tools/build-managers/wafHook/setup-hook.sh b/nixpkgs/pkgs/development/tools/build-managers/wafHook/setup-hook.sh
new file mode 100644
index 000000000000..439350c3abc2
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/build-managers/wafHook/setup-hook.sh
@@ -0,0 +1,75 @@
+wafConfigurePhase() {
+    runHook preConfigure
+
+    if ! [ -f "${wafPath:=./waf}" ]; then
+        echo "copying waf to $wafPath..."
+        cp @waf@/bin/waf "$wafPath"
+    fi
+
+    if [ -z "${dontAddPrefix:-}" ] && [ -n "$prefix" ]; then
+        wafConfigureFlags="${prefixKey:---prefix=}$prefix $wafConfigureFlags"
+    fi
+
+    local flagsArray=(
+        "${flagsArray[@]}"
+        $wafConfigureFlags "${wafConfigureFlagsArray[@]}"
+        ${configureTargets:-configure}
+    )
+    if [ -z "${dontAddWafCrossFlags:-}" ]; then
+        flagsArray+=(@crossFlags@)
+    fi
+    echoCmd 'configure flags' "${flagsArray[@]}"
+    python "$wafPath" "${flagsArray[@]}"
+
+    runHook postConfigure
+}
+
+if [ -z "${dontUseWafConfigure-}" -a -z "${configurePhase-}" ]; then
+    configurePhase=wafConfigurePhase
+fi
+
+wafBuildPhase () {
+    runHook preBuild
+
+    # set to empty if unset
+    : ${wafFlags=}
+
+    local flagsArray=(
+      ${enableParallelBuilding:+-j ${NIX_BUILD_CORES}}
+      $wafFlags ${wafFlagsArray[@]}
+      $buildFlags ${buildFlagsArray[@]}
+      ${buildTargets:-build}
+    )
+
+    echoCmd 'build flags' "${flagsArray[@]}"
+    python "$wafPath" "${flagsArray[@]}"
+
+    runHook postBuild
+}
+
+if [ -z "${dontUseWafBuild-}" -a -z "${buildPhase-}" ]; then
+    buildPhase=wafBuildPhase
+fi
+
+wafInstallPhase() {
+    runHook preInstall
+
+    if [ -n "$prefix" ]; then
+        mkdir -p "$prefix"
+    fi
+
+    local flagsArray=(
+        $wafFlags ${wafFlagsArray[@]}
+        $installFlags ${installFlagsArray[@]}
+        ${installTargets:-install}
+    )
+
+    echoCmd 'install flags' "${flagsArray[@]}"
+    python "$wafPath" "${flagsArray[@]}"
+
+    runHook postInstall
+}
+
+if [ -z "${dontUseWafInstall-}" -a -z "${installPhase-}" ]; then
+    installPhase=wafInstallPhase
+fi