--- Net2/sys/kinfo.h	2018/04/24 18:03:58	1.1
+++ Net2/sys/kinfo.h	2018/04/24 18:16:27	1.1.1.2
@@ -30,9 +30,13 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	@(#)kinfo.h	7.9 (Berkeley) 6/26/91
+ *	from: @(#)kinfo.h	7.9 (Berkeley) 6/26/91
+ *	kinfo.h,v 1.3 1993/05/20 16:22:30 cgd Exp
  */
 
+#ifndef _SYS_KINFO_H_
+#define _SYS_KINFO_H_
+
 /*
  * Get kernel info
  */
@@ -89,3 +93,5 @@ __BEGIN_DECLS
 int	getkerninfo __P((int, void *, int *, int));
 __END_DECLS
 #endif
+
+#endif /* !_SYS_KINFO_H_ */