case $THIS_SUB_DEPENDS in
   SPICE) message "spice-gtk requested, forcing enabled spice-gtk dependency"  &&
          persistent_add VIRT_VIEWER_GUI  &&
          VIRT_VIEWER_GUI=spice-gtk
          ;;
    GTK3) message "gtk+3 requested, forcing enabled gtk+3 dependency" &&
          VIRT_VIEWER_GTK_VER=3 &&
          depends gtk+3 '--with-gtk=3.0'
          ;;
    GTK2) message "gtk+2 requested, forcing enabled gtk+2 dependency" &&
          VIRT_VIEWER_GTK_VER=2 &&
          depends gtk+2 '--with-gtk=2.0'
          ;;
     VNC) message "gtk-vnc requested, forcing enabled gtk-vnc dependency"  &&
          persistent_add VIRT_VIEWER_GUI  &&
          VIRT_VIEWER_GUI=gtk-vnc
          ;;
       *) message "${PROBLEM_COLOR}bogus sub_depends: $SPELL $THIS_SUB_DEPENDS${DEFAULT_COLOR}"
          return 1
          ;;
esac
