--- src/sys/sys/unistd.h	2003/11/27 19:57:36	1.3
+++ src/sys/sys/unistd.h	2004/11/09 17:52:45	1.4
@@ -145,6 +145,7 @@
 #define	_SC_2_UPE		25
 #define	_SC_STREAM_MAX		26
 #define	_SC_TZNAME_MAX		27
+#define	_SC_IOV_MAX		56
 
 /* configurable system strings */
 #define	_CS_PATH		 1