anchor.diff: -{ stdenv, lib, fetchFromGitHub, pkgconfig, protobuf, automake
  -, autoreconfHook, zlib
  -, enableGrpc ? false
  +{ stdenv, lib, fetchFromGitHub, pkgconfig, protobuf, cmake, zlib
  +, opentracing-cpp, enableGrpc ? false
   }:
   
   let
  
positive.code:     fetchFromGitHub {
        owner = "lightstep";
        repo = "lightstep-tracer-common";
        rev = "fe1f65f4a221746f9fffe8bf544c81d4e1b8aded";
        sha256 = "1qqpjxfrjmhnhs15nhbfv28fsgzi57vmfabxlzc99j4vl78h5iln";
      };
  
  in
  
  stdenv.mkDerivation rec {
    name = "lightstep-tracer-cpp-${version}";
    version = "0.36";
  
    src = fetchFromGitHub {
      owner = "lightstep";
      repo = "lightstep-tracer-cpp";
      rev = "v0_36";
      sha256 = "1sfj91bn7gw7fga7xawag076c8j9l7kiwhm4x3zh17qhycmaqq16";
    };
  
    postUnpack = ''
      cp -r ${common}/* $sourceRoot/lightstep-tracer-common
    '';
  
    preConfigure = lib.optionalString (!enableGrpc) ''
      configureFlagsArray+=("--disable-grpc")
    '';
  
    nativeBuildInputs = [
      pkgconfig automake autoreconfHook
    ];
  
    buildInputs = [
  
negative.code:     license = licenses.mit;
      platforms = platforms.linux;
      maintainers = with maintainers; [ cstrahan ];
    };
  }
  