optional_depends alsa-lib \
                 "--enable-alsa" \
                 "--disable-alsa" \
                 "for ALSA sound driver support" &&

optional_depends libao \
                 "--enable-libao" \
                 "--disable-libao" \
                 "for libao sound driver support" &&

optional_depends libsndfile \
                 "--with-sndfle" \
                 "--without-sndfile" \
                 "for libsndfile usage" &&

optional_depends libvorbis \
                 "--with-ogg" \
                 "--without-ogg" \
                 "for Ogg Vorbis usage" &&

optional_depends flac \
                 "--with-flac" \
                 "--without-flac" \
                 "for FLAC usage" &&

optional_depends LIBAVCODEC \
                 "--with-ffmpeg" \
                 "--without-ffmpeg" \
                 "for ffmpeg usage" &&

optional_depends libmad \
                 "--with-mad" \
                 "--without-mad" \
                 "for MAD (MP3 Audio Decoder) usage" &&

optional_depends libid3tag \
                 "--with-id3tag" \
                 "--without-id3tag" \
                 "for id3tag usage" &&

optional_depends lame \
                 "--with-lame" \
                 "--without-lame" \
                 "for LAME (LAME Ain't a MP3 Encoder) usage" &&

optional_depends wavpack \
                 "--with-wavpack" \
                 "--without-wavpack" \
                 "for wavpack usage" &&

optional_depends libpng \
                 "--with-png" \
                 "--without-png" \
                 "for PNG usage" &&

optional_depends libsamplerate \
                 "--with-samplerate" \
                 "--without-samplerate" \
                 "for libsamplerate (a.k.a. Secret Rabbit Code) usage" &&

optional_depends ladspa \
                 "--with-ladspa-path=$INSTALL_ROOT/usr/lib/ladspa" \
                 "--without-ladspa" \
                 "for LADSPA usage"
