anchor.diff:  { lib, stdenv, fetchFromGitHub, fetchpatch, cmake, zlib, c-ares, pkg-config, openssl, protobuf
  -, gflags, abseil-cpp, libnsl
  +, gflags, libnsl
   }:
   
   stdenv.mkDerivation rec {
  -  version = "1.34.1"; # N.B: if you change this, change pythonPackages.grpcio-tools to a matching version too
  +  version = "1.35.0"; # 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 = "0p6si9i0gg885ag2x87a7jyzhgd5lhx2bh2vjj2ra1jn6y3vg6qk";
  +    sha256 = "0vxgp3kqxsglavzs91ybpkkh7aaywxcryacp5z3z6dpsgmw0mscd";
       fetchSubmodules = true;
     };
     patches = [
  
positive.code:   ];
  
    nativeBuildInputs = [ cmake pkg-config ];
    buildInputs = [ zlib c-ares c-ares.cmake-config openssl protobuf gflags abseil-cpp ]
      ++ lib.optionals stdenv.isLinux [ libnsl ];
  
    cmakeFlags =
  
negative.code:       "-DgRPC_SSL_PROVIDER=package"
        "-DgRPC_PROTOBUF_PROVIDER=package"
        "-DgRPC_GFLAGS_PROVIDER=package"
        "-DBUILD_SHARED_LIBS=ON"
        "-DCMAKE_SKIP_BUILD_RPATH=OFF"
      ];
  