anchor.diff:      propagatedBuildInputs = [
         net
       ];
  -    date = "2017-09-01";
  +    date = "2017-09-28";
     };
   
     go-stream-muxer = buildFromGitHub {
  
positive.code: 
    lz4 = buildFromGitHub {
      version = 3;
      rev = "08c27939df1bd95e881e2c2367a749964ad1fceb";
      owner  = "pierrec";
      repo   = "lz4";
      sha256 = "1ivkfwsf9nvikfhh06vv6qyikwh628s33wz05cfv1xp1ckknr9ad";
      propagatedBuildInputs = [
        pierrec_xxhash
      ];
      date = "2017-08-28";
    };
  
    macaron_v1 = buildFromGitHub {
  
negative.code:       yaml
        yaml_v2
      ];
      excludedPackages = "\\(test\\|suite\\|fixtures\\|examples\\|docker\\)";
      meta.autoUpdate = false;
      postPatch = ''
        sed -i 's,--gofast_out,--go_out,' Makefile
      '';
      preBuild = ''
        GATEWAY_SRC=$(readlink -f unpack/grpc-gateway*)/src
        API_SRC=$GATEWAY_SRC/github.com/grpc-ecosystem/grpc-gateway/third_party/googleapis
        PROTO_INCLUDE=$GATEWAY_SRC:$API_SRC \
          make -C go/src/$goPackagePath buildbox-grpc
      '';
      preFixup = ''
        test -f "$bin"/bin/tctl
      '';
    };
  
    template = buildFromGitHub {
  