diff --git a/src/modules/system/acconfig.h b/src/modules/system/acconfig.h
index 9c27941f63eca6f2539f0519e3cc968b1f006865..8c97abee1c982614c3f180f556dfdbf081677cc7 100644
--- a/src/modules/system/acconfig.h
+++ b/src/modules/system/acconfig.h
@@ -1,5 +1,5 @@
 /*
- * $Id: acconfig.h,v 1.2 1998/05/22 12:50:22 grubba Exp $
+ * $Id: acconfig.h,v 1.3 1998/05/31 14:07:51 grubba Exp $
  *
  * System dependant definitions for the system module for Pike
  *
@@ -24,4 +24,7 @@
 /* Define if you have pw_gecos in the passwd struct */
 #undef HAVE_PW_GECOS
 
+/* Define if <netinet/in.h> defines the in_addr_t type. */
+#undef HAVE_IN_ADDR_T
+
 #endif /* SYSTEM_MACHINE_H */