case $THIS_SUB_DEPENDS in
  APNG) if [[ $ANI_PNG != y ]]; then
               message "Requested $SPELL with animated png's support, forcing option ANI_PNG=y" &&
               ANI_PNG=y
        fi;;
     *) message "${PROBLEM_COLOR}bogus sub_depends: $SPELL $THIS_SUB_DEPENDS${DEFAULT_COLOR}"; return 1;;
esac
