--- Net2/sys/tprintf.h	2018/04/24 18:03:58	1.1.1.1
+++ Net2/sys/tprintf.h	2018/04/24 18:17:00	1.1.1.2
@@ -30,12 +30,18 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	@(#)tprintf.h	7.2 (Berkeley) 5/4/91
+ *	from: @(#)tprintf.h	7.2 (Berkeley) 5/4/91
+ *	tprintf.h,v 1.3 1993/05/20 16:23:26 cgd Exp
  */
 
+#ifndef _SYS_TPRINTF_H_
+#define _SYS_TPRINTF_H_
+
 typedef struct session *tpr_t;
 
 tpr_t	tprintf_open __P((struct proc *));
 void	tprintf_close __P((tpr_t));
 
 void	tprintf __P((tpr_t, const char *fmt, ...));
+
+#endif /* !_SYS_TPRINTF_H_ */