--- Net2/netinet/tcp_fsm.h	2018/04/24 18:03:54	1.1
+++ Net2/netinet/tcp_fsm.h	2018/04/24 18:13:40	1.1.1.2
@@ -30,9 +30,13 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	@(#)tcp_fsm.h	7.4 (Berkeley) 6/28/90
+ *	from: @(#)tcp_fsm.h	7.4 (Berkeley) 6/28/90
+ *	tcp_fsm.h,v 1.3 1993/05/20 03:50:35 cgd Exp
  */
 
+#ifndef _NETINET_TCP_FSM_H_
+#define _NETINET_TCP_FSM_H_
+
 /*
  * TCP FSM state definitions.
  * Per RFC793, September, 1981.
@@ -83,3 +87,5 @@ char *tcpstates[] = {
 	"LAST_ACK",	"FIN_WAIT_2",	"TIME_WAIT",
 };
 #endif
+
+#endif /* !_NETINET_TCP_FSM_H_ */