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 libXv lzma openal openjpeg_1 libpulseaudio rtmpdump
  +    libxcb libXv lzma openal openjpeg_1 libpulseaudio rtmpdump opencore-amr
       samba SDL2 soxr speex vid-stab wavpack x264 x265 xavs xvidcore zeromq4 zlib
     ] ++ optional openglExtlib mesa
       ++ optionals nonfreeLicensing [ fdk_aac openssl ]
  
positive.code: , nvenc ? false, nvidia-video-sdk ? null # NVIDIA NVENC support
  , openal ? null # OpenAL 1.1 capture support
  #, opencl ? null # OpenCL code
  #, opencore-amr ? null # AMR-NB de/encoder & AMR-WB decoder
  #, opencv ? null # Video filtering
  , openglExtlib ? false, mesa ? null # OpenGL rendering
  #, openh264 ? null # H.264/AVC encoder
  
negative.code:     (enableFeature nvenc "nvenc")
      (enableFeature (openal != null) "openal")
      #(enableFeature opencl "opencl")
      (enableFeature (opencore-amr != null && version3Licensing) "libopencore-amrnb")
      #(enableFeature (opencv != null) "libopencv")
      (enableFeature openglExtlib "opengl")
      #(enableFeature (openh264 != null) "openh264")
  