anchor.diff:      owner = "grpc";
       repo = "grpc";
       rev = "v${version}";
  -    sha256 = "05728b472785835b9921054d17594f5c35637282f757c025fc0e0fe8ba667610";
  +    sha256 = "48b5e25129861c062b4aeb9d524aea901c13bfb7b9585be954ae6fb99fbd0d6e";
     };
   
     nativeBuildInputs = [
  
positive.code: }:
  
  let
    version = "1.9.0";
  in
  stdenv.mkDerivation {
    name = "grpc-${version}";
  
negative.code:   ];
  
    preBuild = ''
      sed -i 's,\(grpc++.*\.so\.\)6,\11,g' Makefile
      makeFlagsArray+=("prefix=$out")
    '';
  
  