anchor.diff:  
         cp -rL ${llvmPackages.clang-unwrapped}/lib/clang $out/lib
   
  -      cp -d ${libcxx}/lib/libc++*.dylib $out/lib
  -      cp -d ${libcxxabi}/lib/libc++abi*.dylib $out/lib
  +      cp -d ${llvmPackages.libcxx}/lib/libc++*.dylib $out/lib
  +      cp -d ${llvmPackages.libcxxabi}/lib/libc++abi*.dylib $out/lib
   
         mkdir $out/include
  -      cp -rd ${libcxx}/include/c++     $out/include
  +      cp -rd ${llvmPackages.libcxx}/include/c++     $out/include
   
         cp -d ${icu.out}/lib/libicu*.dylib $out/lib
         cp -d ${zlib.out}/lib/libz.*       $out/lib
  
positive.code: { system ? builtins.currentSystem }:
  
  with import ../../.. { inherit system; };
  
  rec {
    coreutils_ = coreutils.override (args: {
      # We want coreutils without ACL support.
      aclSupport = false;
  
negative.code: 
    # The ultimate test: bootstrap a whole stdenv from the tools specified above and get a package set out of it
    test-pkgs = let
      stdenv = import "${test-pkgspath}/pkgs/stdenv/darwin" { inherit system bootstrapFiles; };
    in import test-pkgspath {
      inherit system;
      bootStdenv = stdenv.stdenvDarwin;
    };
  