[#if HAVE_NET_IF_H
# include <net/if.h>
#endif
+#if HAVE_NETINET_IN_VAR_H
+#if HAVE_NET_IF_VAR_H
+# include <netinet/in_var.h>
+# include <net/if_var.h>
+#endif
#if HAVE_SYS_UN_H
# include <sys/un.h>