+AC_CHECK_LIB(readline, main, [readline=true; AC_DEFINE(HAVE_READLINE)], [readline=false])
+AC_CHECK_LIB(ncurses, main, [ncurses=true; AC_DEFINE(HAVE_NCURSES)], [ncurses=false])
+AC_CHECK_LIB(curses, main, [curses=true; AC_DEFINE(HAVE_CURSES)], [curses=false])