--- Net2/sys/ipc.h	2018/04/24 18:03:58	1.1.1.1
+++ Net2/sys/ipc.h	2018/04/24 18:17:02	1.1.1.3
@@ -35,14 +35,16 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	@(#)ipc.h	7.2 (Berkeley) 2/5/91
+ *	from: @(#)ipc.h	7.2 (Berkeley) 2/5/91
+ *	ipc.h,v 1.3 1993/05/20 16:22:27 cgd Exp
  */
 
+#ifndef _SYS_IPC_H_
+#define _SYS_IPC_H_
+
 /*
  * SVID compatible ipc.h file
  */
-#ifndef _IPC_H_
-#define _IPC_H_
 
 typedef	long	key_t;	/* XXX should be in types.h */
 
@@ -71,4 +73,4 @@ struct ipc_perm {
 #define	IPC_SET		1	/* set options */
 #define	IPC_STAT	2	/* get options */
 
-#endif /* !_IPC_H_ */
+#endif /* !_SYS_IPC_H_ */