--- Net2/sys/vlimit.h	2018/04/24 18:03:58	1.1.1.1
+++ Net2/sys/vlimit.h	2018/04/24 18:16:41	1.1.1.2
@@ -30,9 +30,13 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	@(#)vlimit.h	7.2 (Berkeley) 5/5/91
+ *	from: @(#)vlimit.h	7.2 (Berkeley) 5/5/91
+ *	vlimit.h,v 1.3 1993/05/20 16:23:49 cgd Exp
  */
 
+#ifndef _SYS_VLIMIT_H_
+#define _SYS_VLIMIT_H_
+
 /*
  * Limits for u.u_limit[i], per process, inherited.
  */
@@ -47,3 +51,5 @@
 #define	NLIMITS		6
 
 #define	INFINITY	0x7fffffff
+
+#endif /* !_SYS_VLIMIT_H_ */