anchor.diff:  , protobuf-cpp
   , pulseaudio_lib
   , qt5
  +, rnnoise
   , speech-dispatcher
   , speex
   , speexdsp
  
positive.code:     "no-oss"
      "${boolNo (portaudio != null)}portaudio"
      "no-wasapi"
      "no-asio"  # TODO: asio support, ASIOInput.h
      "no-bundled-speex"
      "no-sbcelt"
      "bundled-celt"
      "opus"
      "no-bundled-opus"
      "vorbis-recording"
      "${boolNo mumbleOverlay}overlay"
      "no-qt4-legacy-compat"
  
negative.code:     opus
      portaudio
      pulseaudio_lib
      rnnoise
      speech-dispatcher
      speex
      speexdsp
  