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-rw-r--r--nixpkgs/pkgs/development/compilers/llvm/7/compiler-rt.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/nixpkgs/pkgs/development/compilers/llvm/7/compiler-rt.nix b/nixpkgs/pkgs/development/compilers/llvm/7/compiler-rt.nix
index e9853c58ca57..84ca6af3b36d 100644
--- a/nixpkgs/pkgs/development/compilers/llvm/7/compiler-rt.nix
+++ b/nixpkgs/pkgs/development/compilers/llvm/7/compiler-rt.nix
@@ -56,7 +56,7 @@ stdenv.mkDerivation {
   # can build this. If we didn't do it, basically the entire nixpkgs on Darwin would have an unfree dependency and we'd
   # get no binary cache for the entire platform. If you really find yourself wanting the TSAN, make this controllable by
   # a flag and turn the flag off during the stdenv build.
-  postPatch = ''
+  postPatch = stdenv.lib.optionalString (!stdenv.isDarwin) ''
     substituteInPlace cmake/builtin-config-ix.cmake \
       --replace 'set(X86 i386)' 'set(X86 i386 i486 i586 i686)'
   '' + stdenv.lib.optionalString stdenv.isDarwin ''