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. */