anchor.diff:      #(enableFeature (schroedinger != null) "libschroedinger")
       #(enableFeature (shine != null) "libshine")
       (enableFeature (samba != null && gplLicensing && version3Licensing) "libsmbclient")
  -    (enableFeature (SDL != null) "sdl") # Only configurable since 2.5, auto detected before then
  +    (enableFeature (SDL2 != null) "sdl2")
       (enableFeature (soxr != null) "libsoxr")
       (enableFeature (speex != null) "libspeex")
       #(enableFeature (twolame != null) "libtwolame")
  
positive.code:     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
      samba SDL soxr speex vid-stab wavpack x264 x265 xavs xvidcore zeromq4 zlib
    ] ++ optional openglExtlib mesa
      ++ optionals x11grabExtlib [ libXext libXfixes ]
      ++ optionals nonfreeLicensing [ fdk_aac openssl ]
  
negative.code:                      && avformatLibrary
                       && swscaleLibrary
                       && swresampleLibrary
                       && SDL2 != null;
  assert ffprobeProgram -> avcodecLibrary && avformatLibrary;
  assert ffserverProgram -> avformatLibrary;
  /*
  