anchor.diff:  { lib, stdenv, fetchFromGitHub, fetchpatch, cmake, zlib, c-ares, pkg-config, re2, openssl, protobuf
  -, gflags, abseil-cpp, libnsl
  +, abseil-cpp, libnsl
   }:
   
   stdenv.mkDerivation rec {
  -  version = "1.36.4"; # N.B: if you change this, change pythonPackages.grpcio-tools to a matching version too
  +  version = "1.37.0"; # N.B: if you change this, change pythonPackages.grpcio-tools to a matching version too
     pname = "grpc";
     src = fetchFromGitHub {
       owner = "grpc";
       repo = "grpc";
       rev = "v${version}";
  -    sha256 = "1zxvdg5vgjgkq5wmzwbxj2zydaj90ja074axs26yzd9x08j0bjxz";
  +    sha256 = "0q3hcnq351j0qm0gsbaxbsnz1gd9w3bk4cazkvq4l2lfmmiw7z56";
       fetchSubmodules = true;
     };
     patches = [
  
positive.code: 
    nativeBuildInputs = [ cmake pkg-config ];
    propagatedBuildInputs = [ c-ares re2 zlib abseil-cpp ];
    buildInputs = [ c-ares.cmake-config openssl protobuf gflags ]
      ++ lib.optionals stdenv.isLinux [ libnsl ];
  
    cmakeFlags =
  
negative.code:       "-DgRPC_RE2_PROVIDER=package"
        "-DgRPC_SSL_PROVIDER=package"
        "-DgRPC_PROTOBUF_PROVIDER=package"
        "-DgRPC_ABSL_PROVIDER=package"
        "-DBUILD_SHARED_LIBS=ON"
        "-DCMAKE_SKIP_BUILD_RPATH=OFF"
  