anchor.diff:      #(mkFlag (libavc1394 != null) null null)
       (mkFlag (libbluray != null) "1.0" "libbluray")
       (mkFlag (libbs2b != null) "2.3" "libbs2b")
  -    (mkFlag (libcaca != null) "1.0" "libcaca")
  +    #(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")
  
positive.code: , libXv ? null # Xlib support
  , lzma ? null # xz-utils
  #, nvenc ? 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
  
negative.code: , freetype ? null # Needed for drawtext filter
  , frei0r ? null # frei0r video filtering
  , fribidi ? null # Needed for drawtext filter
  #, game-music-emu ? null # Game Music Emulator
  , gnutls ? null
  #, gsm ? null # GSM de/encoder
  #, ilbc ? null # iLBC de/encoder
  #, jack2 ? null # Jack audio (only version 2 is supported in this build)
  , ladspaH ? null # LADSPA audio filtering
  , lame ? null # LAME MP3 encoder
  , libass ? null # (Advanced) SubStation Alpha subtitle rendering
  , libbluray ? null # BluRay reading
  , libbs2b ? null # bs2b DSP library
  #, libcaca ? null # Textual display (ASCII art)
  #, libcdio-paranoia ? null # Audio CD grabbing
  , libdc1394 ? null, libraw1394 ? null # IIDC-1394 grabbing (ieee 1394)
  , libiconv ? null
  