Blank screen on xorg initialization

I am having problems on xorg with my "Silicon Integrated Systems [SiS] 300/305 PCI/AGP VGA Display Adapter":

X Window System Version 7.1.1
Release Date: 12 May 2006
X Protocol Version 11, Revision 0, Release 7.1.1
Build Operating System: Linux 2.6.15.7 i686
Current Operating System: Linux pentium3-casa 2.6.15-23-386 #1 PREEMPT Tue May 23 13:49:40 UTC 2006 i686
Build Date: 07 July 2006
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 to make sure that you have the latest version.
Module Loader present
Markers: (--) probed, (**) from config file, (==) default setting,
 (++) from command line, (!!) notice, (II) informational,
 (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Tue Sep 5 00:51:54 2006
(==) Using config file: "/etc/X11/xorg.conf"
/usr/X11R6/bin/X: symbol lookup error: /usr/lib/xorg/modules/drivers/sis_drv.so: undefined symbol: assert

I could correct this problem by using a patch from git:
http://gitweb.freedesktop.org/?p=xorg/driver/xf86-video-sis.git;a=commitdiff;h=7a38608cd4cae811d12b7424f19af6d732a52f03

file:8565936330b31e55af8e2f9cdee86d0b0cdbb565 -> file:67b5b354d1962d4144f311672a2a87d30c8d2a1a
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2006-06-06 Donnie Berkholz <email address hidden>
+
+ * src/sis_dri.c:
+ Add missing #include <assert.h>.
+
 2006-04-30 Alex Deucher <email address hidden>

         * src/sis300_accel.c: (SiS300AccelInit):
file:4a773551c4aaec857ebbd224c37942c26fb5f439 -> file:4ce678f21c211c2a598d2f4b3d3f50a021d910d7
--- a/src/sis_dri.c
+++ b/src/sis_dri.c
@@ -1,5 +1,5 @@
 /* $XFree86$ */
-/* $XdotOrg$ */
+/* $XdotOrg: driver/xf86-video-sis/src/sis_dri.c,v 1.26 2005/10/21 18:40:19 ajax Exp $ */
 /*
  * DRI wrapper for 300 and 315 series
  *
@@ -40,6 +40,8 @@
 #include "config.h"
 #endif

+#include <assert.h>
+
 #include "sis.h"
 #include "sis_regs.h"