anchor.diff:    src = fetchFromGitHub {
       owner = "KhronosGroup";
       repo = "MoltenVK";
  -    rev = "v${version}";
  +    rev = "v${finalAttrs.version}";
       hash = "sha256-5ie1IGzZqaYbciFnrBJ1/9V0LEuz7JsEOFXXkG3hJzg=";
     };
   
  
positive.code:     license = lib.licenses.asl20;
      platforms = lib.platforms.darwin;
    };
  }
  
negative.code: let
    libcxx.dev = "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr";
  in
  stdenvNoCC.mkDerivation (finalAttrs: {
    pname = "MoltenVK";
    version = "1.1.9";
  
  