optional_depends  "libmad"    ""  ""  "to decode MP3"   &&
optional_depends  "lame"   ""  ""  "to encode MP3"   &&
optional_depends  "alsa-lib"   "--with-alsa-dsp"  "--without-alsa-dsp"  "for alsa-dsp support" 
optional_depends  "libvorbis"  "" "--disable-ogg-vorbis" "for ogg/vorbis 
support" 
