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