--- Net2/netiso/cltp_var.h	2018/04/24 18:03:58	1.1
+++ Net2/netiso/cltp_var.h	2018/04/24 18:17:38	1.1.1.2
@@ -30,9 +30,13 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	@(#)cltp_var.h	7.3 (Berkeley) 6/28/90
+ *	from: @(#)cltp_var.h	7.3 (Berkeley) 6/28/90
+ *	cltp_var.h,v 1.3 1993/05/20 05:27:01 cgd Exp
  */
 
+#ifndef _NETISO_CLTP_VAR_H_
+#define _NETISO_CLTP_VAR_H_
+
 #define UD_TPDU_type	0x40	/* packet type */
 
 #define CLTPOVAL_SRC	0xc1	/* Source TSAP -- required */
@@ -52,3 +56,5 @@ struct	cltpstat {
 struct	isopcb cltb;
 struct	cltpstat cltpstat;
 #endif
+
+#endif /* !_NETISO_CLTP_VAR_H_ */