--- error.c.orig  1998-06-15
+++ error.c       2007-03-21
--- .././qmail-1.03/error.c	Mon Jun 15 12:53:16 1998
+++ ../qmail-1.03.2418/error.c	Sun Jan 15 16:13:14 2006
@@ -93,3 +93,10 @@
 #else
 -13;
 #endif
+
+int error_proto =
+#ifdef EPROTO
+EPROTO;
+#else
+-15;
+#endif