diff --git a/ncurses/base/lib_window.c b/ncurses/base/lib_window.c
new file mode 100644
index 0000000..a3236e2
--- /dev/null
+++ b/ncurses/base/lib_window.c
@@ -0,0 +1,250 @@
+/****************************************************************************
+ * 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_window.c
+**
+**
+*/
+
+#include <curses.priv.h>
+
+MODULE_ID("$Id: lib_window.c,v 1.25 2008/06/07 14:12:56 tom Exp $")
+
+NCURSES_EXPORT(void)
+_nc_synchook(WINDOW *win)
+/* hook to be called after each window change */
+{
+    if (win->_immed)
+	wrefresh(win);
+    if (win->_sync)
+	wsyncup(win);
+}
+
+NCURSES_EXPORT(int)
+mvderwin(WINDOW *win, int y, int x)
+/* move a derived window */
+{
+    WINDOW *orig;
+    int i;
+
+    T((T_CALLED("mvderwin(%p,%d,%d)"), win, y, x));
+
+    if (win && (orig = win->_parent)) {
+	if (win->_parx == x && win->_pary == y)
+	    returnCode(OK);
+	if (x < 0 || y < 0)
+	    returnCode(ERR);
+	if ((x + getmaxx(win) > getmaxx(orig)) ||
+	    (y + getmaxy(win) > getmaxy(orig)))
+	    returnCode(ERR);
+    } else
+	returnCode(ERR);
+    wsyncup(win);
+    win->_parx = x;
+    win->_pary = y;
+    for (i = 0; i < getmaxy(win); i++)
+	win->_line[i].text = &(orig->_line[y++].text[x]);
+    returnCode(OK);
+}
+
+NCURSES_EXPORT(int)
+syncok(WINDOW *win, bool bf)
+/* enable/disable automatic wsyncup() on each change to window */
+{
+    T((T_CALLED("syncok(%p,%d)"), win, bf));
+
+    if (win) {
+	win->_sync = bf;
+	returnCode(OK);
+    } else
+	returnCode(ERR);
+}
+
+NCURSES_EXPORT(void)
+wsyncup(WINDOW *win)
+/* mark changed every cell in win's ancestors that is changed in win */
+/* Rewritten by J. Pfeifer, 1-Apr-96 (don't even think that...)      */
+{
+    WINDOW *wp;
+
+    T((T_CALLED("wsyncup(%p)"), win));
+    if (win && win->_parent) {
+	for (wp = win; wp->_parent; wp = wp->_parent) {
+	    int y;
+	    WINDOW *pp = wp->_parent;
+
+	    assert((wp->_pary <= pp->_maxy) &&
+		   ((wp->_pary + wp->_maxy) <= pp->_maxy));
+
+	    for (y = 0; y <= wp->_maxy; y++) {
+		int left = wp->_line[y].firstchar;
+		if (left >= 0) {	/* line is touched */
+		    struct ldat *line = &(pp->_line[wp->_pary + y]);
+		    /* left & right character in parent window coordinates */
+		    int right = wp->_line[y].lastchar + wp->_parx;
+		    left += wp->_parx;
+
+		    CHANGED_RANGE(line, left, right);
+		}
+	    }
+	}
+    }
+    returnVoid;
+}
+
+NCURSES_EXPORT(void)
+wsyncdown(WINDOW *win)
+/* mark changed every cell in win that is changed in any of its ancestors */
+/* Rewritten by J. Pfeifer, 1-Apr-96 (don't even think that...)           */
+{
+    T((T_CALLED("wsyncdown(%p)"), win));
+
+    if (win && win->_parent) {
+	WINDOW *pp = win->_parent;
+	int y;
+
+	/* This recursion guarantees, that the changes are propagated down-
+	   wards from the root to our direct parent. */
+	wsyncdown(pp);
+
+	/* and now we only have to propagate the changes from our direct
+	   parent, if there are any. */
+	assert((win->_pary <= pp->_maxy) &&
+	       ((win->_pary + win->_maxy) <= pp->_maxy));
+
+	for (y = 0; y <= win->_maxy; y++) {
+	    if (pp->_line[win->_pary + y].firstchar >= 0) {	/* parent changed */
+		struct ldat *line = &(win->_line[y]);
+		/* left and right character in child coordinates */
+		int left = pp->_line[win->_pary + y].firstchar - win->_parx;
+		int right = pp->_line[win->_pary + y].lastchar - win->_parx;
+		/* The change may be outside the child's range */
+		if (left < 0)
+		    left = 0;
+		if (right > win->_maxx)
+		    right = win->_maxx;
+		CHANGED_RANGE(line, left, right);
+	    }
+	}
+    }
+    returnVoid;
+}
+
+NCURSES_EXPORT(void)
+wcursyncup(WINDOW *win)
+/* sync the cursor in all derived windows to its value in the base window */
+{
+    WINDOW *wp;
+
+    T((T_CALLED("wcursyncup(%p)"), win));
+    for (wp = win; wp && wp->_parent; wp = wp->_parent) {
+	wmove(wp->_parent, wp->_pary + wp->_cury, wp->_parx + wp->_curx);
+    }
+    returnVoid;
+}
+
+NCURSES_EXPORT(WINDOW *)
+dupwin(WINDOW *win)
+/* make an exact duplicate of the given window */
+{
+    WINDOW *nwin = 0;
+    size_t linesize;
+    int i;
+
+    T((T_CALLED("dupwin(%p)"), win));
+
+    if (win != 0) {
+
+	_nc_lock_global(curses);
+	if (win->_flags & _ISPAD) {
+	    nwin = newpad(win->_maxy + 1,
+			  win->_maxx + 1);
+	} else {
+	    nwin = newwin(win->_maxy + 1,
+			  win->_maxx + 1,
+			  win->_begy,
+			  win->_begx);
+	}
+
+	if (nwin != 0) {
+
+	    nwin->_curx = win->_curx;
+	    nwin->_cury = win->_cury;
+	    nwin->_maxy = win->_maxy;
+	    nwin->_maxx = win->_maxx;
+	    nwin->_begy = win->_begy;
+	    nwin->_begx = win->_begx;
+	    nwin->_yoffset = win->_yoffset;
+
+	    nwin->_flags = win->_flags & ~_SUBWIN;
+	    /* Due to the use of newwin(), the clone is not a subwindow.
+	     * The text is really copied into the clone.
+	     */
+
+	    WINDOW_ATTRS(nwin) = WINDOW_ATTRS(win);
+	    nwin->_nc_bkgd = win->_nc_bkgd;
+
+	    nwin->_notimeout = win->_notimeout;
+	    nwin->_clear = win->_clear;
+	    nwin->_leaveok = win->_leaveok;
+	    nwin->_scroll = win->_scroll;
+	    nwin->_idlok = win->_idlok;
+	    nwin->_idcok = win->_idcok;
+	    nwin->_immed = win->_immed;
+	    nwin->_sync = win->_sync;
+	    nwin->_use_keypad = win->_use_keypad;
+	    nwin->_delay = win->_delay;
+
+	    nwin->_parx = 0;
+	    nwin->_pary = 0;
+	    nwin->_parent = (WINDOW *) 0;
+	    /* See above: the clone isn't a subwindow! */
+
+	    nwin->_regtop = win->_regtop;
+	    nwin->_regbottom = win->_regbottom;
+
+	    if (win->_flags & _ISPAD)
+		nwin->_pad = win->_pad;
+
+	    linesize = (win->_maxx + 1) * sizeof(NCURSES_CH_T);
+	    for (i = 0; i <= nwin->_maxy; i++) {
+		memcpy(nwin->_line[i].text, win->_line[i].text, linesize);
+		nwin->_line[i].firstchar = win->_line[i].firstchar;
+		nwin->_line[i].lastchar = win->_line[i].lastchar;
+	    }
+	}
+	_nc_unlock_global(curses);
+    }
+    returnWin(nwin);
+}