case $THIS_SUB_DEPENDS in
   SPICE) [[  "x${VIRT_VIEWER_GUI}" == "xspice-gtk" ]]  && return 0 ;;
    GTK3) is_depends_enabled $SPELL gtk+3  ;;
    GTK2) is_depends_enabled $SPELL gtk+2  ;;
     VNC) [[  "x${VIRT_VIEWER_GUI}" == "xgtk-vnc" ]]  && return 0 ;;
    *) message "${PROBLEM_COLOR}bogus sub_depends: $SPELL $THIS_SUB_DEPENDS${DEFAULT_COLOR}"
       return 1;;
esac
