dev-libs/libltdl:0=
>=media-sound/gsm-1.0.12-r1
sys-apps/file

alsa?
      ( media-libs/alsa-lib )

amr?
      ( media-libs/opencore-amr )

ao?
      ( media-libs/libao:= )

encode?
      ( >=media-sound/lame-3.98.4 )

flac?
      ( >=media-libs/flac-1.1.3:= )

id3tag?
      ( media-libs/libid3tag:= )

ladspa?
      ( media-libs/ladspa-sdk )

mad?
      ( media-libs/libmad )

ogg?
      ( media-libs/libogg media-libs/libvorbis )

opus?
      ( media-libs/opus media-libs/opusfile )

png?
      ( media-libs/libpng:0= sys-libs/zlib )

pulseaudio?
      ( media-libs/libpulse )

sndfile?
      ( >=media-libs/libsndfile-1.0.11 )

sndio?
      ( media-sound/sndio:= )

twolame?
      ( media-sound/twolame )

wavpack?
      ( media-sound/wavpack )