anchor.diff:      libwebp
       mesa
       mpg123
  +    musepack
       openal
       #opencv
       openh264
  
positive.code: , libwebp
  , mesa
  , mpg123
  , openal
  #, opencv
  , openh264
  
negative.code:     libbs2b
      libmms
      libmodplug
      libopus
      librsvg
      libvdpau
  