optional_depends svgalib "--enable-svgalib=yes" "--enable-svgalib=no" "Enable svgalib support"
optional_depends jack "--enable-jackdigi=yes" "--enable-jackdigi=no" "Enable JACK support"
optional_depends alsa-lib "--enable-alsadigi=yes" "--enable-alsadigi=no" "Enable alsa support"
optional_depends esound "--enable-esddigi=yes" "--enable-esddigi=no" "Enable esd support"