case "$THIS_SUB_DEPENDS" in
  VOLUME_ID) true;;
     EXTRAS) list_add UDEV_OPTS --enable-extras
             list_remove UDEV_OPTS --disable-extras ;;
          *) message "${PROBLEM_COLOR}bogus sub_depends: $SPELL $THIS_SUB_DEPENDS${DEFAULT_COLOR}" &&
             return 1;;
esac
