optional_depends ncurses \
                 "" "--without-ncurses" \
                 "for ncurses interface support" &&

optional_depends gpm \
                 "" "--without-gpm" \
                 "for console mouse support" &&

optional_depends gtk+ \
                 "" "--without-gtk1" \
                 "for GTK+1 GUI support" &&

optional_depends gtk+2 \
                 "" "--without-gtk" \
                 "for GTK+2 GUI support"
