This is a workaround for bug 515050
https://bugzilla.novell.com/show_bug.cgi?id=515050#c2

Real fix is something else which did not make into 2.4.2
http://lists.ximian.com/pipermail/mono-patches/2009-June/151386.html
http://lists.ximian.com/pipermail/mono-patches/2009-June/151387.html

but we are ok with workaround its safe.

-Khem
Index: mono-2.4.2.3/mono/mini/genmdesc.pl
===================================================================
--- mono-2.4.2.3.orig/mono/mini/genmdesc.pl	2009-10-15 18:21:45.000000000 -0700
+++ mono-2.4.2.3/mono/mini/genmdesc.pl	2009-10-15 18:22:19.000000000 -0700
@@ -47,7 +47,7 @@ sub load_opcodes
 		$arch_define = "TARGET_ARM";
 	}
 		
-	$cpp .= " -D$arch_define $srcdir/mini-ops.h|";
+	$cpp .= " -DMONO_ARCH_SUPPORT_SIMD_INTRINSICS -D$arch_define $srcdir/mini-ops.h|";
 	#print "Running: $cpp\n";
 	open (OPS, $cpp) || die "Cannot execute cpp: $!";
 	while (<OPS>) {