fix a compiler warning
diff --git a/extensions/libipt_recent.c b/extensions/libipt_recent.c
index e38fa31..09ea922 100644
--- a/extensions/libipt_recent.c
+++ b/extensions/libipt_recent.c
@@ -8,6 +8,17 @@
#include <iptables.h>
#include <linux/netfilter_ipv4/ipt_recent.h>
+/* need thos two to not fail compilation with old kernel, new userspace */
+#ifndef RECENT_NAME
+#define RECENT_NAME "ipt_recent"
+#endif /* RECENT_NAME */
+#ifndef RECENT_VER
+#define RECENT_VER "unknown"
+#endif /* RECENT_VER */
+#ifndef IPT_RECENT_NAME_LEN
+#define IPT_RECENT_NAME_LEN 200
+#endif /* IPT_RECENT_NAME_LEN */
+
/* Function which prints out usage message. */
static void
help(void)