diff --git a/src/acconfig.h b/src/acconfig.h
index f9516056eae9aa09d68b4c4c12a0f53edebcbf76..8d1c8ec1763c250ba99f80cc954618843c1ec57b 100644
--- a/src/acconfig.h
+++ b/src/acconfig.h
@@ -1,5 +1,5 @@
 /*
- * $Id: acconfig.h,v 1.28 1998/07/11 15:49:05 grubba Exp $
+ * $Id: acconfig.h,v 1.29 1998/07/23 00:43:51 hubbe Exp $
  */
 #ifndef MACHINE_H
 #define MACHINE_H
@@ -59,6 +59,9 @@
 /* Define if you have isspace */
 #undef HAVE_ISSPACE
 
+/* Define if you have fpsetmask */
+#undef HAVE_FPSETMASK
+
 /* Define if you have crypt.  */
 #undef HAVE_CRYPT