case $THIS_SUB_DEPENDS in
  TIMEPATCH) if [[ $JACK_VCS != y ]]
             then
               echo "Time patch requested, forcing option JACK_TIME=y."  &&
               JACK_TIME=y && persistent_add  JACK_TIME
             fi
             ;;
        VCS) echo "Development version requested, forcing option JACK_VCS=y."  &&
             JACK_VCS=y && persistent_add  JACK_VCS
             ;;
          *) echo "Unknown sub-dependency '$THIS_SUB_DEPENDS'"!
             return 1
             ;;
esac
