diff --git a/test/demo_keyok.c b/test/demo_keyok.c
new file mode 100644
index 0000000..8724d98
--- /dev/null
+++ b/test/demo_keyok.c
@@ -0,0 +1,82 @@
+/****************************************************************************
+ * Copyright (c) 2002-2003,2006 Free Software Foundation, Inc.              *
+ *                                                                          *
+ * Permission is hereby granted, free of charge, to any person obtaining a  *
+ * copy of this software and associated documentation files (the            *
+ * "Software"), to deal in the Software without restriction, including      *
+ * without limitation the rights to use, copy, modify, merge, publish,      *
+ * distribute, distribute with modifications, sublicense, and/or sell       *
+ * copies of the Software, and to permit persons to whom the Software is    *
+ * furnished to do so, subject to the following conditions:                 *
+ *                                                                          *
+ * The above copyright notice and this permission notice shall be included  *
+ * in all copies or substantial portions of the Software.                   *
+ *                                                                          *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
+ * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
+ *                                                                          *
+ * Except as contained in this notice, the name(s) of the above copyright   *
+ * holders shall not be used in advertising or otherwise to promote the     *
+ * sale, use or other dealings in this Software without prior written       *
+ * authorization.                                                           *
+ ****************************************************************************/
+/*
+ * $Id: demo_keyok.c,v 1.5 2006/11/04 20:09:51 tom Exp $
+ *
+ * Demonstrate the keyok() function.
+ * Thomas Dickey - 2002/11/23
+ */
+
+#include <test.priv.h>
+
+#if defined(NCURSES_VERSION) && NCURSES_EXT_FUNCS
+int
+main(int argc GCC_UNUSED, char *argv[]GCC_UNUSED)
+{
+    int lastch = ERR;
+    int ch;
+    WINDOW *win;
+
+    initscr();
+    (void) cbreak();		/* take input chars one at a time, no wait for \n */
+    (void) noecho();		/* don't echo input */
+
+    printw("Typing any function key will disable it, but typing it twice in\n");
+    printw("a row will turn it back on (just for a demo).");
+    refresh();
+
+    win = newwin(LINES - 2, COLS, 2, 0);
+    scrollok(win, TRUE);
+    keypad(win, TRUE);
+    wmove(win, 0, 0);
+
+    while ((ch = wgetch(win)) != ERR) {
+	const char *name = keyname(ch);
+	wprintw(win, "Keycode %d, name %s\n",
+		ch,
+		name != 0 ? name : "<null>");
+	wclrtoeol(win);
+	wrefresh(win);
+	if (ch >= KEY_MIN) {
+	    keyok(ch, FALSE);
+	    lastch = ch;
+	} else if (lastch >= KEY_MIN) {
+	    keyok(lastch, TRUE);
+	}
+    }
+    endwin();
+    ExitProgram(EXIT_SUCCESS);
+}
+#else
+int
+main(void)
+{
+    printf("This program requires the ncurses library\n");
+    ExitProgram(EXIT_FAILURE);
+}
+#endif