optional_depends  libavc1394  ""  ""  "for firewire support"  &&
optional_depends  xorg-libs \
                  "--with-x"  \
                  "--without-x"  \
                  "for X11 support"  &&
optional_depends  OPENGL  \
                  "--with-opengl"  \
                  "--without-opengl"  \
                  "for ALSA support"  &&
optional_depends  GTK2  \
                  "--with-gtk"  \
                  "--without-gtk"  \
                  "for libquicktime_config tool"  &&
optional_depends  libdv  \
                  "--with-libdv"  \
                  "--without-libdv"  \
                  "for DV video support"  &&
optional_depends  libvorbis  \
                  ""  \
                  "--without-vorbis"  \
                  "for ogg/vorbis support"  &&
optional_depends  lame  \
                  "--with-lame"  \
                  "--without-lame"  \
                  "for mp3 support"  &&
optional_depends  JPEG  \
                  "--with-libjpeg"  \
                  "--without-libjpeg"  \
                  "for jpeg support"  &&
optional_depends  libpng  \
                  "--with-libpng"  \
                  "--without-libpng"  \
                  "for png support"  &&
optional_depends  schroedinger  \
                  "--with-schroedinger"  \
                  "--without-schroedinger"  \
                  "for schroedinger support"  &&
optional_depends  faac  \
                  "--with-faac"  \
                  "--without-faac"  \
                  "for faac support"  &&
optional_depends  faad2  \
                  "--with-faad2"  \
                  "--without-faad2"  \
                  "for faad support"  &&
optional_depends  LIBAVCODEC  \
                  "--with-ffmpeg"  \
                  "--without-ffmpeg"  \
                  "AV decoding"  &&
optional_depends  x264  \
                  "--with-x264"  \
                  "--without-x264"  \
                  "encoding H264/AVC video streams"  &&
optional_depends  doxygen  \
                  "--with-doxygen"  \
                  "--without-doxygen"  \
                  "to documentation generation"