case $THIS_SUB_DEPENDS in
  PDF) is_depends_enabled $SPELL poppler;;
  XCB) is_depends_enabled $SPELL xcb-util;;
  PNG) is_depends_enabled $SPELL libpng;;
   PS) is_depends_enabled $SPELL ghostscript;;
  SVG) is_depends_enabled $SPELL librsvg2;;
    X) is_depends_enabled $SPELL libx11;;
    *) message "${PROBLEM_COLOR}bogus sub_depends: $SPELL $THIS_SUB_DEPENDS${DEFAULT_COLOR}"
       return 1;;
esac
