$NetBSD$
--- arpdig.c	2009-07-15 19:46:20.000000000 -0500
+++ arpdig.c	2009-07-15 19:47:20.000000000 -0500
@@ -4,13 +4,16 @@
 
 #include <sys/types.h>
 #include <sys/socket.h>
-#include <net/ethernet.h>
 #include <net/if.h>
 #include <net/if_dl.h>
 #include <net/if_types.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
-
+#if defined(__NetBSD__)
+#include <net/if_ether.h>
+#else
+#include <net/ethernet.h>
+#endif
 #include <ctype.h>
 #include <err.h>
 #include <ifaddrs.h>
