--- choparp.c.orig	Sat Nov 29 15:38:49 1997
+++ choparp.c	Sat Nov 29 15:45:52 1997
@@ -21,6 +21,9 @@
 #include <net/if.h>
 #include <netinet/in.h>
 /* #include <net/if_arp.h> */
+#if (__FreeBSD__ >= 3)
+ #include <net/if_var.h>
+#endif
 #include <netinet/if_ether.h>
 #include <sys/param.h>
 #include <errno.h>