S390 updates
diff --git a/acconfig.h b/acconfig.h
index c163409..0adf548 100644
--- a/acconfig.h
+++ b/acconfig.h
@@ -30,12 +30,15 @@
 /* Define if this is an alpha architecture.  */
 #undef ALPHA
 
-/* Define if this is a arm architecture.  */
+/* Define if this is an arm architecture.  */
 #undef ARM
 
-/* Define if this is an powerpc architecture.  */
+/* Define if this is a powerpc architecture.  */
 #undef POWERPC
 
+/* Define if this is a S390 architecture.  */
+#undef S390
+
 /* Define if you have a SVR4 MP type procfs.  I.E. /dev/xxx/ctl,
    /dev/xxx/status.  Also implies that you have the pr_lwp
    member in prstatus. */