--- xc/config/cf/linux.cf.save	2003-07-25 14:59:38.000000000 -0400
+++ xc/config/cf/linux.cf	2003-07-25 19:30:37.000000000 -0400
@@ -831,7 +831,7 @@
 
 #ifdef s390Architecture
 # ifndef OptimizedCDebugFlags
-#  define OptimizedCDebugFlags	-O2 -fomit-frame-pointer GccAliasingArgs
+#  define OptimizedCDebugFlags	-O0 -fomit-frame-pointer GccAliasingArgs
 # endif
 # define LinuxMachineDefines	-D__s390__
 # define ServerOSDefines	XFree86ServerOSDefines -DDDXTIME -DPART_NET