--- Net2/arch/i386/include/pte.h	2018/04/24 18:04:01	1.1
+++ Net2/arch/i386/include/pte.h	2018/04/24 18:20:47	1.1.1.2
@@ -33,7 +33,8 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	@(#)pte.h	5.5 (Berkeley) 5/9/91
+ *	from: @(#)pte.h	5.5 (Berkeley) 5/9/91
+ *	pte.h,v 1.3 1993/06/27 04:50:14 andrew Exp
  */
 
 /*
@@ -47,6 +48,9 @@
  * structure used in page clustering.
  */
 
+#ifndef _I386_PTE_H_
+#define _I386_PTE_H_
+
 #ifndef LOCORE
 struct pde
 {
@@ -134,3 +138,5 @@ unsigned int
 extern	struct pte *Sysmap;
 #endif
 #endif
+
+#endif /* _I386_PTE_H_ */