--- mono-2.0/mono/mini/main.c	2008-08-03 07:49:23.000000000 +0100
+++ mono-2.0/mono/mini/main-new.c	2008-08-03 07:55:10.000000000 +0100
@@ -23,10 +23,16 @@
 }
 
 #else
-
+#include <sched.h>
 int
 main (int argc, char* argv[])
 {
+    /* On PowerPC call sched_setaffinity to bind to one CPU only
+     * to work around parallelism bug on G5 SMP */
+    #ifdef __powerpc__
+    unsigned long mask = 1;
+    sched_setaffinity(0, sizeof(mask), &mask);
+    #endif
 	return mono_main (argc, argv);
 }