anchor.diff:        "-DgRPC_SSL_PROVIDER=package"
         "-DgRPC_PROTOBUF_PROVIDER=package"
         "-DgRPC_GFLAGS_PROVIDER=package"
  +      "-DgRPC_ABSL_PROVIDER=package"
         "-DBUILD_SHARED_LIBS=ON"
         "-DCMAKE_SKIP_BUILD_RPATH=OFF"
  +      "-DCMAKE_CXX_STANDARD=17"
       ];
   
     # CMake creates a build directory by default, this conflicts with the
  
positive.code:   ];
  
    nativeBuildInputs = [ cmake pkg-config ];
    propagatedBuildInputs = [ c-ares re2 zlib ];
    buildInputs = [ c-ares.cmake-config openssl protobuf gflags ]
      ++ lib.optionals stdenv.isLinux [ libnsl ];
  
  
negative.code: { lib, stdenv, fetchFromGitHub, fetchpatch, cmake, zlib, c-ares, pkg-config, re2, openssl, protobuf
  , gflags, abseil-cpp, libnsl
  }:
  
  stdenv.mkDerivation rec {
  