anchor.diff:                       && avformatLibrary
                        && swscaleLibrary
                        && swresampleLibrary
  -                     && SDL != null;
  +                     && SDL2 != null;
   assert ffprobeProgram -> avcodecLibrary && avformatLibrary;
   assert ffserverProgram -> avformatLibrary;
   /*
  
positive.code:     #(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 (soxr != null) "libsoxr")
      (enableFeature (speex != null) "libspeex")
      #(enableFeature (twolame != null) "libtwolame")
  
negative.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 SDL2 soxr speex vid-stab wavpack x264 x265 xavs xvidcore zeromq4 zlib
    ] ++ optional openglExtlib mesa
      ++ optionals x11grabExtlib [ libXext libXfixes ]
      ++ optionals nonfreeLicensing [ fdk_aac openssl ]
  