anchor.diff:      curl
       dconf
       libepoxy
  -    ffmpeg
       fftw
       fftwFloat
       flex
  
positive.code:   ];
  
    mesonFlags = [
      "-Denable_ffmpeg=true"
      "-Denable_rtmidi=true"
      "-Denable_rtaudio=true"
      "-Denable_sdl=true"
      "-Dcarla=enabled"
      "-Dmanpage=true"
      # "-Duser_manual=true" # needs sphinx-intl
  
negative.code: , curl
  , dconf
  , libepoxy
  , fftw
  , fftwFloat
  , flex
  