anchor.diff:  
     buildInputs = [
       bzip2 celt fontconfig freetype fribidi gnutls ladspaH lame libass libbluray
  -    libbs2b libcaca libdc1394 libogg libopus libtheora libvdpau libvorbis
  +    libbs2b /* libcaca */ libdc1394 libogg libopus libtheora libvdpau libvorbis
       libwebp libX11 libxcb libXext libXfixes libXv lzma SDL soxr speex x264
  -    xvidcore zeromq4 zlib
  +    xvidcore /* zeromq4 */ zlib
     ] ++ optional (disDarwinFix sambaExtlib) samba
       ++ optional openglExtlib mesa
       ++ optionals x11grabExtlib [ libXext libXfixes ]
       ++ optionals nonfreeLicensing [ faac faad2 fdk_aac openssl ]
       ++ optionals (!isDarwin) [
  -      frei0r game-music-emu gsm jack2 libmodplug libssh libvpx openal
  -      openjpeg_1 pulseaudio rtmpdump vid-stab wavpack x265 xavs
  +      frei0r /* game-music-emu gsm jack2 */ libmodplug libssh libvpx /* openal */
  +      openjpeg_1 pulseaudio rtmpdump vid-stab wavpack x265 /* xavs */
     ] ++ optional (!isDarwin && !isCygwin) libva
  -    ++ optionals isLinux [ alsaLib libraw1394 v4l_utils ];
  +    ++ optionals isLinux [ alsaLib libraw1394 /* v4l_utils */ ];
   
     # Build qt-faststart executable
     buildPhase = optional (qt-faststartProgram && (reqMin "0.9")) ''make tools/qt-faststart'';
  
positive.code:     #(mkFlag (libavc1394 != null) null null)
      (mkFlag (libbluray != null) "1.0" "libbluray")
      (mkFlag (libbs2b != null) "2.3" "libbs2b")
      (mkFlag (libcaca != null) "1.0" "libcaca")
      #(mkFlag (cdio-paranoia != null && gplLicensing) "0.9" "libcdio")
      (mkFlag (if !isLinux then false else libdc1394 != null && libraw1394 != null && isLinux) "0.5" "libdc1394")
      (mkFlag (libiconv != null) "1.2" "iconv")
  
negative.code:     (mkFlag (speex != null) "0.5" "libspeex")
      #(mkFlag (twolame != null) "1.0" "libtwolame")
      #(mkFlag (utvideo != null && gplLicensing) "0.9" "libutvideo")
      #(mkFlag (if !isLinux then false else v4l_utils != null && isLinux) "0.9" "libv4l2")
      (mkFlag (disDarwinFix (vid-stab != null && gplLicensing)) "2.2" "libvidstab") # Actual min. version 2.0
      #(mkFlag (vo-aacenc != null && version3Licensing) "0.6" "libvo-aacenc")
      #(mkFlag (vo-amrwbenc != null && version3Licensing) "0.7" "libvo-amrwbenc")
  