anchor.diff:      version = "4.9.3";
       sourceSha256 = "1af3cfqwk7lq1b5qsh1am0922fyhy7wmlpnrqdnvch3zzza9n1qm";
       jarSha256 = "0dnz2x54kigc58bxnynjhmr5iq49f938vj6p50gdir1xdna41kdg";
  -    extraCppPatchFlags = [ "-p3" ];
       extraCppBuildInputs = [ utf8cpp ]
         ++ lib.optional stdenv.isLinux libuuid;
     }).antlr;
  
positive.code:         pname = "antlr-runtime-cpp";
          inherit version;
          src = source;
  
          outputs = [ "out" "dev" "doc" ];
  
          postUnpack = ''
            export sourceRoot=$sourceRoot/runtime/Cpp
          '';
  
          patchFlags =
            if extraCppPatchFlags == []
            then null
            else extraCppPatchFlags;
  
          nativeBuildInputs = [ cmake ninja pkg-config ];
          buildInputs =
  
negative.code: 
    mkAntlr = {
      version, sourceSha256, jarSha256,
      extraCppBuildInputs ? [],
      extraCppCmakeFlags ? []
    }: rec {
  