depends cmake &&

optional_depends oss '-DWANT_OSS=on' '-DWANT_OSS=off' 'use OSS for playback?' &&
optional_depends alsa-lib '-DWANT_ALSA=on' '-DWANT_ALSA=off' 'use alsa for playback?' &&
optional_depends OPENAL '-DWANT_OPENAL=on' '-DWANT_OPENAL=off' 'use openal for playback?'