--- Net2/sys/timeb.h	2018/04/24 18:03:58	1.1
+++ Net2/sys/timeb.h	2018/04/24 18:17:03	1.1.1.2
@@ -30,9 +30,13 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	@(#)timeb.h	7.2 (Berkeley) 5/5/91
+ *	from: @(#)timeb.h	7.2 (Berkeley) 5/5/91
+ *	timeb.h,v 1.3 1993/05/20 16:23:24 cgd Exp
  */
 
+#ifndef _SYS_TIMEB_H_
+#define _SYS_TIMEB_H_
+
 /* The ftime(2) system call structure -- deprecated. */
 struct timeb {
 	time_t	time;			/* seconds since the Epoch */
@@ -40,3 +44,5 @@ struct timeb {
 	short	timezone;		/* minutes west of CUT */
 	short	dstflag;		/* DST == non-zero */
 };
+
+#endif /* !_SYS_TIMEB_H_ */