--- Net2/sys/mtio.h	2018/04/24 18:03:58	1.1
+++ Net2/sys/mtio.h	2018/04/24 18:16:30	1.1.1.2
@@ -30,9 +30,13 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	@(#)mtio.h	7.6 (Berkeley) 2/5/91
+ *	from: @(#)mtio.h	7.6 (Berkeley) 2/5/91
+ *	mtio.h,v 1.3 1993/05/20 16:22:46 cgd Exp
  */
 
+#ifndef _SYS_MTIO_H_
+#define _SYS_MTIO_H_
+
 /*
  * Structures and definitions for mag tape io control commands
  */
@@ -115,3 +119,5 @@ struct mtget {
 #define	T_6250BPI	020		/* select 6250 bpi */
 #define	T_BADBPI	030		/* undefined selection */
 #endif
+
+#endif /* !_SYS_MTIO_H_ */