anchor.diff:  , alsa-lib
   , avahi
   , boost
  -, fixesproto
   , grpc
   , ice
  -, inputproto
   , libbsd
   , libcap
   , libsndfile
  
positive.code:     speech-dispatcher
      speex
      speexdsp
      xproto
    ] ++ optionals (config == "murmur") [
      grpc
      ice
  
negative.code:     qt5
    ] ++ optionals (config == "mumble") [
      alsa-lib
      libsndfile
      libx11
      libxext
  