{ lib, stdenv, fetchurl, bison, buildPackages, pkgsBuildTarget }:

let
  mkJam = { pname, version, src, meta ? { } }: stdenv.mkDerivation {
    inherit pname version src;

    depsBuildBuild = [ buildPackages.stdenv.cc ];
    nativeBuildInputs = [ bison ];

    # Jambase expects ar to have flags.
    preConfigure = ''
      export AR="$AR rc"
    '';

    # When cross-compiling, we need to set the preprocessor macros
    # OSMAJOR/OSMINOR/OSPLAT to the values from the target platform, not the
    # host platform. This looks a little ridiculous because the vast majority of
    # build tools don't embed target-specific information into their binary, but
    # in this case we behave more like a compiler than a make(1)-alike.
    postPatch = lib.optionalString (stdenv.hostPlatform != stdenv.targetPlatform) ''
      cat >>jam.h <<EOF
      #undef OSMAJOR
      #undef OSMINOR
      #undef OSPLAT
      $(
        ${pkgsBuildTarget.targetPackages.stdenv.cc}/bin/${pkgsBuildTarget.targetPackages.stdenv.cc.targetPrefix}cc -E -dM jam.h \
          | grep -E '^#define (OSMAJOR|OSMINOR|OSPLAT) '
      )
      EOF
    '';

    LOCATE_TARGET = "bin.unix";

    buildPhase = ''
      runHook preBuild
      make $makeFlags jam0
      ./jam0 -j$NIX_BUILD_CORES -sCC=${buildPackages.stdenv.cc.targetPrefix}cc jambase.c
      ./jam0 -j$NIX_BUILD_CORES
      runHook postBuild
    '';

    installPhase = ''
      runHook preInstall
      mkdir -p $out/bin $out/doc/jam
      cp bin.unix/jam $out/bin/jam
      cp *.html $out/doc/jam
      runHook postInstall
    '';

    enableParallelBuilding = true;

    meta = with lib; {
      license = licenses.free;
      mainProgram = "jam";
      platforms = platforms.unix;
    } // meta;
  };
in
{
  jam = let
    pname = "jam";
    version = "2.6.1";

    base = mkJam {
      inherit pname version;

      src = fetchurl {
        url = "https://swarm.workshop.perforce.com/projects/perforce_software-jam/download/main/${pname}-${version}.tar";
        sha256 = "19xkvkpycxfsncxvin6yqrql3x3z9ypc1j8kzls5k659q4kv5rmc";
      };

      meta = with lib; {
        description = "Just Another Make";
        homepage = "https://www.perforce.com/resources/documentation/jam";
        maintainers = with maintainers; [ impl orivej ];
      };
    };
  in base.overrideAttrs (oldAttrs: {
    makeFlags = (oldAttrs.makeFlags or []) ++ [
      "CC=${buildPackages.stdenv.cc.targetPrefix}cc"
    ];
  });

  ftjam = let
    pname = "ftjam";
    version = "2.5.2";

    base = mkJam {
      inherit pname version;

      src = fetchurl {
        url = "https://downloads.sourceforge.net/project/freetype/${pname}/${version}/${pname}-${version}.tar.bz2";
        hash = "sha256-6JdzUAqSkS3pGOn+v/q+S2vOedaa8ZRDX04DK4ptZqM=";
      };

      meta = with lib; {
        description = "FreeType's enhanced, backwards-compatible Jam clone";
        homepage = "https://freetype.org/jam/";
        maintainers = with maintainers; [ AndersonTorres impl ];
      };
    };
  in base.overrideAttrs (oldAttrs: {
    postPatch = (oldAttrs.postPatch or "") + ''
      substituteInPlace Jamfile --replace strip ${stdenv.cc.targetPrefix}strip
    '';

    # Doesn't understand how to cross compile once bootstrapped, so we'll just
    # use the Makefile for the bootstrapping portion.
    configurePlatforms = [ "build" "target" ];
    configureFlags = (oldAttrs.configureFlags or []) ++ [
      "CC=${buildPackages.stdenv.cc.targetPrefix}cc"
      "--host=${stdenv.buildPlatform.config}"
    ];
  });
}