anchor.diff:      owner = "google";
       repo = "shaderc";
       rev = "v${version}";
  -    sha256 = "0qigmj0riw43pgjn5f6kpvk72fajssz1lc2aiqib5qvmj9rqq3hl";
  +    sha256 = "1l5mmyxhzsbp0a6y2d86i8jmf46c6bjgjkdgkr5l8hmhflmm7gi2";
     };
   
     patchPhase = ''
  
positive.code: { stdenv, fetchFromGitHub, cmake, python }:
  # Like many google projects, shaderc doesn't gracefully support separately compiled dependencies, so we can't easily use
  # the versions of glslang and spirv-tools used by vulkan-loader. Exact revisions are taken from
  # https://github.com/google/shaderc/blob/known-good/known_good.json
  
negative.code:     ln -s ${spirv-headers} third_party/spirv-tools/external/spirv-headers
    '';
  
    nativeBuildInputs = [ cmake python3 ];
  
    postInstall = ''
      moveToOutput "lib/*.a" $static
  