anchor.diff:      bzip2 celt dav1d fontconfig freetype frei0r fribidi game-music-emu gnutls gsm
       libjack2 ladspaH lame libaom libass libbluray libbs2b libcaca libdc1394 libmodplug libmysofa
       libogg libopus librsvg libssh libtheora libvdpau libvorbis libvpx libwebp libX11
  -    libxcb libXv libXext libxml2 xz openal openjpeg libpulseaudio rav1e svt-av1 rtmpdump opencore-amr
  +    libxcb libXv libXext libxml2 xz openal ocl-icd opencl-headers openjpeg libpulseaudio rav1e svt-av1 rtmpdump opencore-amr
       samba SDL2 soxr speex srt vid-stab vo-amrwbenc x264 x265 xavs xvidcore
       zeromq4 zimg zlib openh264
     ] ++ optionals openglExtlib [ libGL libGLU ]
  
positive.code:     (enableFeature (xz != null) "lzma")
      (enableFeature nvenc "nvenc")
      (enableFeature (openal != null) "openal")
      #(enableFeature opencl "opencl")
      (enableFeature (opencore-amr != null && version3Licensing) "libopencore-amrnb")
      #(enableFeature (opencv != null) "libopencv")
      (enableFeature openglExtlib "opengl")
  
negative.code:  *
   * Not packaged:
   *   aacplus avisynth cdio-paranoia crystalhd libavc1394 libiec61883
   *   libnut libquvi nvenc oss shine twolame
   *   utvideo vo-aacenc vo-amrwbenc xvmc zvbi blackmagic-design-desktop-video
   *
   * Need fixes to support Darwin:
  