--- tcpd.h.orig	2022-07-28 10:46:11.000000000 -0400
+++ tcpd.h	2022-07-28 10:48:45.000000000 -0400
@@ -4,6 +4,9 @@
   * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
   */
 
+#ifndef _TCP_WRAPPERS_TCPD_H
+#define _TCP_WRAPPERS_TCPD_H
+
 /* Need FILE. */
 #include <stdio.h>
 
@@ -310,3 +313,4 @@
 
 __END_DECLS
 
+#endif /* _TCP_WRAPPERS_TCPD_H */