anchor.diff:      license = licenses.mit;
       platforms = platforms.linux;
       maintainers = with maintainers; [ cstrahan ];
  -    broken = true; # 2018-02-16
     };
   }
  
positive.code: { stdenv, lib, fetchFromGitHub, pkgconfig, protobuf, automake
  , autoreconfHook, zlib
  , enableGrpc ? false
  }:
  
  let
  
negative.code:     fetchFromGitHub {
        owner = "lightstep";
        repo = "lightstep-tracer-common";
        rev = "5fe3bf885bcece14c3c65df06c86c826ba45ad69";
        sha256 = "1q39a0zaqbnqyhl2hza2xzc44235p65bbkfkzs2981niscmggq8w";
      };
  
  in
  
  stdenv.mkDerivation rec {
    name = "lightstep-tracer-cpp-${version}";
    version = "0.8.1";
  
    src = fetchFromGitHub {
      owner = "lightstep";
      repo = "lightstep-tracer-cpp";
      rev = "v${version}";
      sha256 = "1m4kl70lhvy1bsmkdh6bf2fddz5v1ikb27vgi99i2akpq40g4fvf";
    };
  
    postUnpack = ''
      cp -r ${common}/* $sourceRoot/lightstep-tracer-common
    '';
  
    cmakeFlags = ["-DOPENTRACING_INCLUDE_DIR=${opentracing-cpp}/include" "-DOPENTRACING_LIBRARY=${opentracing-cpp}/lib/libopentracing.so"] ++ lib.optional (!enableGrpc) [ "-DWITH_GRPC=OFF" ];
  
    nativeBuildInputs = [
      pkgconfig cmake
    ];
  
    buildInputs = [
  