1 files changed, 0 insertions, 2 deletions
diff --git a/pkgs/development/compilers/llvm/9/libc++/default.nix b/pkgs/development/compilers/llvm/9/libc++/default.nix
index c9f0e6254ab..23265ed0d35 100644
--- a/pkgs/development/compilers/llvm/9/libc++/default.nix
+++ b/pkgs/development/compilers/llvm/9/libc++/default.nix
@@ -38,8 +38,6 @@ stdenv.mkDerivation {
       "-DLIBCXX_ENABLE_EXCEPTIONS=OFF"
     ] ++ stdenv.lib.optional (!enableShared) "-DLIBCXX_ENABLE_SHARED=OFF";
 
-  enableParallelBuilding = true;
-
   passthru = {
     isLLVM = true;
   };