anchor.diff:      unpackFile ${protobuf-cpp.src}
       mv -v protobuf* third_party/protobuf
   
  +    grep -q '\-Werror' Makefile
       sed -i 's, -Werror,,g' Makefile
     '';
   
  
positive.code:     owner = "grpc";
      repo = "grpc";
      rev = "v${version}";
      sha256 = "81ac28b5b69bbecffc58e7eb529f77125763ee8b6a71fcf85bbf0ac8a7ea394d";
    };
  
    nativeBuildInputs = [
  
negative.code: }:
  
  let
    version = "1.15.0";
  in
  stdenv.mkDerivation {
    name = "grpc-${version}";
  