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diff --git a/nx-X11/lib/src/GetWMCMapW.c b/nx-X11/lib/src/GetWMCMapW.c
new file mode 100644
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+++ b/nx-X11/lib/src/GetWMCMapW.c
@@ -0,0 +1,87 @@
+
+/***********************************************************
+
+Copyright 1987, 1998  The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+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
+OPEN GROUP 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 of The Open Group shall not be
+used in advertising or otherwise to promote the sale, use or other dealings
+in this Software without prior written authorization from The Open Group.
+
+
+Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
+
+                        All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted,
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in
+supporting documentation, and that the name of Digital not be
+used in advertising or publicity pertaining to distribution of the
+software without specific, written prior permission.
+
+DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
+ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
+DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
+ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+SOFTWARE.
+
+******************************************************************/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include "Xlibint.h"
+#include <nx-X11/Xatom.h>
+#include <stdio.h>
+
+Status XGetWMColormapWindows (
+    Display *dpy,
+    Window w,
+    Window **colormapWindows,
+    int *countReturn)
+{
+    Atom *data = NULL;
+    Atom actual_type;
+    Atom prop;
+    int actual_format;
+    unsigned long leftover, nitems;
+
+    prop =  XInternAtom(dpy, "WM_COLORMAP_WINDOWS", False);
+    if (prop == None) return False;
+
+    /* get the property */
+    if (XGetWindowProperty (dpy, w, prop,
+    			    0L, 1000000L, False,
+			    XA_WINDOW, &actual_type, &actual_format,
+			    &nitems, &leftover, (unsigned char **) &data)
+	!= Success)
+      return False;
+
+    if (actual_type != XA_WINDOW || actual_format != 32) {
+        Xfree (data);
+	return False;
+    }
+
+    *colormapWindows = (Window *) data;
+    *countReturn = (int) nitems;
+    return True;
+}