anchor.diff:  
     configureFlags = [
       "--help"
  -    "--${boolEn (faad2 != null)}-aac"
  +    "--disable-aac"
       # TODO: adplug support
       #"--${boolEn }-adplug" true null)
       "--${boolEn (alsa-lib != null)}-alsa"
  
positive.code:     curl
      dbus
      expat
      faad2
      ffmpeg
      flac
      fluidsynth
  
negative.code: , curl
  , dbus
  , expat
  , ffmpeg
  , flac
  , fluidsynth
  