optional_depends  cdrtools                 \
                  "--enable-cdrecord"      \
                  "--disable-cdrecord"     \
                  "for MP3 support"        &&

optional_depends  normalize                \
                  "--enable-normalize"     \
                  "--disable-normalize"    \
                  "for ogg support"        &&

optional_depends  mpg321                   \
                  "--enable-mpg312"        \
                  "--disable-mpg321"       \
                  "for MP3 support"        &&

optional_depends  sox                      \
                  "--enable-sox"           \
                  "--disable-sox"          \
                  "for resampling support" &&

optional_depends  libogg                   \
                  "--enable-ogg"           \
                  "--disable-ogg"          \
                  "for ogg support"        &&

optional_depends  libvorbis                \
                  "--enable-vorbis"        \
                  "--disable-vorbis"       \
                  "for vorbis support"

.