optional_depends alsa-lib   "--enable-alsa"       "--disable-alsa"       "for alsa audio support"
optional_depends portaudio  "--enable-portaudio"  "--disable-portaudio"  "for portaudio support"
optional_depends speex      "--enable-speex"      "--disable-speex"      "for speech support"
optional_depends SDL        "--enable-sdl"        "--disable-sdl --enable-xv" "for SDL sound support(n=using X11)"
optional_depends libtheora  "--enable-theora"     "--disable-theora"     "for theora sound support"
optional_depends alsa-oss   "--enable-oss"        "--disable-oss"        "for Alsa oss support"
optional_depends ffmpeg     "--enable-ffmpeg"     "--disable-ffmpeg"     "for ffmpeg support"
optional_depends pulseaudio "--enable-pulseaudio" "--disable-pulseaudio" "for pulseaudio support"
optional_depends spandsp    "--enable-spandsp"    "--disable-spandsp"    "for spandsp support"
optional_depends v4l-utils  ""                    ""                     "for v4l support"

optional_depends ortp       "--enable-external-ortp" "--disable-external-ortp" "Use internal or external ortp"
