Fixup ia64 stuff, part 1
diff --git a/acconfig.h b/acconfig.h
index 21c5bbe..c163409 100644
--- a/acconfig.h
+++ b/acconfig.h
@@ -15,6 +15,9 @@
 /* Define if this is an i386, i486 or pentium architecture.  */
 #undef I386
 
+/* Define if this is an ia64 architecture.  */
+#undef IA64
+
 /* Define if this is an m68k architecture.  */
 #undef M68K