case "$THIS_SUB_DEPENDS" in
  VOLUME_ID) true;;
     EXTRAS) message "${MESSAGE_COLOR}Forcing building of hash function" \
             "generator and access control lists${DEFAULT_COLOR}" &&
             depends acl '--enable-udev_acl' &&
             depends glib2 '--enable-gudev' &&
             depends pkgconfig &&
             depends libusb ;;
          *) message "${PROBLEM_COLOR}bogus sub_depends: $SPELL $THIS_SUB_DEPENDS${DEFAULT_COLOR}" &&
             return 1;;
esac
