diff -ur fvwm-2.5.30~/libs/defaults.h fvwm-2.5.30/libs/defaults.h
--- fvwm-2.5.30~/libs/defaults.h 2009-08-02 10:58:46.000000000 -0400
+++ fvwm-2.5.30/libs/defaults.h 2010-07-12 15:22:18.964353164 -0400
@@ -25,7 +25,7 @@
/* The "extended" buttons do not provide the full functionality because X has
* no bit mask value for them. Things like dragging windows don't work with
* them. */
-#define NUMBER_OF_EXTENDED_MOUSE_BUTTONS 9
+#define NUMBER_OF_EXTENDED_MOUSE_BUTTONS 15
#if NUMBER_OF_EXTENDED_MOUSE_BUTTONS > 31
#error No more than 31 mouse buttons can be supported on 32 bit platforms
#endif