1 files changed, 13 insertions, 0 deletions
diff --git a/pkgs/development/compilers/swift/patches/llvm-include-dirs.patch b/pkgs/development/compilers/swift/patches/llvm-include-dirs.patch
new file mode 100644
index 000000000000..9523943c4801
--- /dev/null
+++ b/pkgs/development/compilers/swift/patches/llvm-include-dirs.patch
@@ -0,0 +1,13 @@
+Only use the Nix include dirs when no sysroot is configured.
+
+--- clang/lib/Driver/ToolChains/Linux.cpp	2018-10-05 18:01:15.731109551 +0200
++++ clang/lib/Driver/ToolChains/Linux.cpp	2018-10-05 18:00:27.959509924 +0200
+@@ -565,7 +565,7 @@
+ 
+   // Check for configure-time C include directories.
+   StringRef CIncludeDirs(C_INCLUDE_DIRS);
+-  if (CIncludeDirs != "") {
++  if (CIncludeDirs != "" && (SysRoot.empty() || SysRoot == "/")) {
+     SmallVector<StringRef, 5> dirs;
+     CIncludeDirs.split(dirs, ":");
+     for (StringRef dir : dirs) {