optional_depends "ncurses" "--enable-curses" "--disable-curses" "for curses frontend"
optional_depends "SDL"     "--enable-sdl"    "--disable-sdl"    "for SDL frontend"
optional_depends "libX11"  "--enable-x11"    "--disable-x11"    "for simple X frontend"
optional_depends "glade2"  "--enable-gtk"    "--disable-gtk"    "for gtk frontend"
