Index: illumos-net-tools/usr/src/cmd/cmd-inet/usr.sbin/arp.c
===================================================================
--- illumos-net-tools.orig/usr/src/cmd/cmd-inet/usr.sbin/arp.c	2012-10-08 00:25:23.000000000 +0000
+++ illumos-net-tools/usr/src/cmd/cmd-inet/usr.sbin/arp.c	2013-03-16 14:33:18.229912016 +0000
@@ -51,6 +51,7 @@
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <sys/ioctl.h>
+#include <sys/sockio.h>
 #include <errno.h>
 #include <netdb.h>
 #include <net/if.h>