diff --git a/ncurses/base/lib_delwin.c b/ncurses/base/lib_delwin.c
new file mode 100644
index 0000000..b92c403
--- /dev/null
+++ b/ncurses/base/lib_delwin.c
@@ -0,0 +1,86 @@
+/****************************************************************************
+ * Copyright (c) 1998-2007,2008 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: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
+ *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
+ ****************************************************************************/
+
+/*
+**	lib_delwin.c
+**
+**	The routine delwin().
+**
+*/
+
+#include <curses.priv.h>
+
+MODULE_ID("$Id: lib_delwin.c,v 1.17 2008/06/07 14:10:56 tom Exp $")
+
+static bool
+cannot_delete(WINDOW *win)
+{
+    WINDOWLIST *p;
+    bool result = TRUE;
+
+    for (each_window(p)) {
+	if (&(p->win) == win) {
+	    result = FALSE;
+	} else if ((p->win._flags & _SUBWIN) != 0
+		   && p->win._parent == win) {
+	    result = TRUE;
+	    break;
+	}
+    }
+    return result;
+}
+
+NCURSES_EXPORT(int)
+delwin(WINDOW *win)
+{
+    int result = ERR;
+
+    T((T_CALLED("delwin(%p)"), win));
+
+    if (_nc_try_global(curses) == 0) {
+	if (win == 0
+	    || cannot_delete(win)) {
+	    result = ERR;
+	} else {
+
+	    if (win->_flags & _SUBWIN)
+		touchwin(win->_parent);
+	    else if (curscr != 0)
+		touchwin(curscr);
+
+	    result = _nc_freewin(win);
+	}
+	_nc_unlock_global(curses);
+    }
+    returnCode(result);
+}