anchor.diff:      bzip2 celt fontconfig freetype frei0r fribidi game-music-emu gnutls gsm
       libjack2 ladspaH lame libass libbluray libbs2b libcaca libdc1394 libmodplug
       libogg libopus libssh libtheora libvdpau libvorbis libvpx libwebp libX11
  -    libxcb libXext libXfixes libXv lzma openal openjpeg_1 libpulseaudio rtmpdump
  +    libxcb libXv lzma openal openjpeg_1 libpulseaudio rtmpdump
       samba SDL2 soxr speex vid-stab wavpack x264 x265 xavs xvidcore zeromq4 zlib
     ] ++ optional openglExtlib mesa
  -    ++ optionals x11grabExtlib [ libXext libXfixes ]
       ++ optionals nonfreeLicensing [ fdk_aac openssl ]
       ++ optional ((isLinux || isFreeBSD) && libva != null) libva
       ++ optionals isLinux [ alsaLib libraw1394 libv4l ]
  
positive.code: #, vo-aacenc ? null # AAC encoder
  #, vo-amrwbenc ? null # AMR-WB encoder
  , wavpack ? null # Wavpack encoder
  , x11grabExtlib ? false, libXext ? null, libXfixes ? null # X11 grabbing (legacy)
  , x264 ? null # H.264/AVC encoder
  , x265 ? null # H.265/HEVC encoder
  , xavs ? null # AVS encoder
  
negative.code:     #(enableFeature (vo-aacenc != null && version3Licensing) "libvo-aacenc")
      #(enableFeature (vo-amrwbenc != null && version3Licensing) "libvo-amrwbenc")
      (enableFeature (wavpack != null) "libwavpack")
      (enableFeature (x264 != null && gplLicensing) "libx264")
      (enableFeature (x265 != null && gplLicensing) "libx265")
      (enableFeature (xavs != null && gplLicensing) "libxavs")
  