anchor.diff:  #, twolame
   #, utvideo
   , v4l_lib
  +#, vapoursynth  # FIXME: recursive dependency
   , vid-stab
   #, vo-aacenc
   , vo-amrwbenc ? null
  
positive.code:     #srt
      tesseract
      v4l_lib
      vid-stab
      wavpack
      x264
  
negative.code:     "--${boolEn (sdl != null)}-sdl"
      "--${boolEn (sdl != null)}-sdl2"
      "--disable-securetransport"
      #(fflag "--${boolEn (vapoursynth != null)}-vapoursynth" "4.1")
      /**/(fflag "--disable-vapoursynth" "4.1")
      #"--${boolEn (libx11 != null && libxv != null)}-xlib"
      "--${boolEn (zlib != null)}-zlib"
      /*
  