diff --git a/mach/vax4/libem/system.h b/mach/vax4/libem/system.h
new file mode 100644
index 00000000..56ac7fac
--- /dev/null
+++ b/mach/vax4/libem/system.h
@@ -0,0 +1,4 @@
+/* $Header$ */
+/*#define BSD42 */
+/*#define BSD41c */
+#define BSD41a