anchor.diff:      protobuf-cpp
       qt5
     ] ++ optionals (config == "mumble") [
  +    adwaita-qt
       alsa-lib
       fixesproto
       inputproto
  
positive.code:     ''
    );
  
    meta = with lib; {
      description = "Low-latency, high quality voice chat software";
      homepage = http://mumble.sourceforge.net/;
  
negative.code:   nativeBuildInputs = [
      python2
    ] ++ optionals (config == "mumble") [
      makeWrapper
      qt5
    ] ++ optionals (config == "murmur") [
      which
  