After start the WindowMaker, double clicking the WPrefs icon makes core.

% cd /usr/local/GNUstep/Applications/WPrefs.app/
% gdb WPrefs
(gdb) r
  .....
Program received signal SIGSEGV, Segmentation fault.
0x00000008018ea57c in _XData32 () from /usr/local/lib/libX11.so.6
(gdb) bt
#0  0x00000008018ea57c in _XData32 () from /usr/local/lib/libX11.so.6
#1  0x00000008018c138f in XChangeProperty () from /usr/local/lib/libX11.so.6
#2  0x0000000000440ecc in WMSetWindowMiniwindowImage ()
#3  0x000000000040768a in Initialize ()
#4  0x00000000004066e2 in main ()

Fix: 

if (!image)
       return;

-    data = wmalloc((image->width * image->height + 2) * sizeof(CARD32));
+    data = wmalloc((image->width * image->height + 2) * sizeof(unsigned long));

     o= 0;
     data[o++] = image->width;--KZCWT7fPG2TSPCtTqVxAGnh3Rnum8AfXHbGZckSlg3vWCzN3
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--- WINGs/wwindow.c.orig        2008-02-05 15:53:08.000000000 +0900
+++ WINGs/wwindow.c     2008-02-05 15:50:18.000000000 +0900
@@ -254,14 +254,14 @@
 setMiniwindow(WMWindow *win, RImage *image)
 {
     WMScreen *scr= win->view->screen;
-    CARD32 *data;
+    unsigned long *data;
     int x, y;
     int o;
How-To-Repeat: Install the packages:
 xorg-7.3_1.tbz
 windowmaker-0.92.0_3.tbz