diff --git a/ncurses/base/define_key.c b/ncurses/base/define_key.c
new file mode 100644
index 0000000..3d5815f
--- /dev/null
+++ b/ncurses/base/define_key.c
@@ -0,0 +1,70 @@
+/****************************************************************************
+ * Copyright (c) 1998-2005,2006 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.                                                           *
+ ****************************************************************************/
+
+/****************************************************************************
+ *  Author: Thomas E. Dickey                    1997-on                     *
+ ****************************************************************************/
+
+#include <curses.priv.h>
+
+MODULE_ID("$Id: define_key.c,v 1.13 2006/12/30 23:23:31 tom Exp $")
+
+NCURSES_EXPORT(int)
+define_key(const char *str, int keycode)
+{
+    int code = ERR;
+
+    T((T_CALLED("define_key(%s,%d)"), _nc_visbuf(str), keycode));
+    if (SP == 0) {
+	code = ERR;
+    } else if (keycode > 0) {
+	unsigned ukey = (unsigned) keycode;
+
+	if (str != 0) {
+	    define_key(str, 0);
+	} else if (has_key(keycode)) {
+	    while (_nc_remove_key(&(SP->_keytry), ukey))
+		code = OK;
+	}
+	if (str != 0) {
+	    if (key_defined(str) == 0) {
+		if (_nc_add_to_try(&(SP->_keytry), str, ukey) == OK) {
+		    code = OK;
+		} else {
+		    code = ERR;
+		}
+	    } else {
+		code = ERR;
+	    }
+	}
+    } else {
+	while (_nc_remove_string(&(SP->_keytry), str))
+	    code = OK;
+    }
+    returnCode(code);
+}