Include local lwtunnel.h unless found in system

configure.in

@@ -218,6 +218,7 @@ esac
 
 AC_CHECK_HEADER(syslog.h, [AC_DEFINE(HAVE_SYSLOG)])
 AC_CHECK_HEADER(alloca.h, [AC_DEFINE(HAVE_ALLOCA_H)])
+AC_CHECK_HEADER([linux/lwtunnel.h], [AC_DEFINE(HAVE_LWTUNNEL)])
 AC_MSG_CHECKING(whether 'struct sockaddr' has sa_len)
 AC_TRY_COMPILE([#include <sys/types.h>
   #include <sys/socket.h>

sysdep/autoconf.h.in

@@ -74,4 +74,7 @@
 /* We have LibSSH */
 #undef HAVE_LIBSSH
 
+/* We have linux lwtunnel */
+#undef HAVE_LWTUNNEL
+
 #define CONFIG_PATH ?

sysdep/linux/lwtunnel.h

@@ -0,0 +1,45 @@
+#ifndef _LWTUNNEL_H_
+#define _LWTUNNEL_H_
+
+#include <linux/types.h>
+
+enum lwtunnel_encap_types {
+	LWTUNNEL_ENCAP_NONE,
+	LWTUNNEL_ENCAP_MPLS,
+	LWTUNNEL_ENCAP_IP,
+	LWTUNNEL_ENCAP_ILA,
+	LWTUNNEL_ENCAP_IP6,
+	__LWTUNNEL_ENCAP_MAX,
+};
+
+#define LWTUNNEL_ENCAP_MAX (__LWTUNNEL_ENCAP_MAX - 1)
+
+enum lwtunnel_ip_t {
+	LWTUNNEL_IP_UNSPEC,
+	LWTUNNEL_IP_ID,
+	LWTUNNEL_IP_DST,
+	LWTUNNEL_IP_SRC,
+	LWTUNNEL_IP_TTL,
+	LWTUNNEL_IP_TOS,
+	LWTUNNEL_IP_FLAGS,
+	LWTUNNEL_IP_PAD,
+	__LWTUNNEL_IP_MAX,
+};
+
+#define LWTUNNEL_IP_MAX (__LWTUNNEL_IP_MAX - 1)
+
+enum lwtunnel_ip6_t {
+	LWTUNNEL_IP6_UNSPEC,
+	LWTUNNEL_IP6_ID,
+	LWTUNNEL_IP6_DST,
+	LWTUNNEL_IP6_SRC,
+	LWTUNNEL_IP6_HOPLIMIT,
+	LWTUNNEL_IP6_TC,
+	LWTUNNEL_IP6_FLAGS,
+	LWTUNNEL_IP6_PAD,
+	__LWTUNNEL_IP6_MAX,
+};
+
+#define LWTUNNEL_IP6_MAX (__LWTUNNEL_IP6_MAX - 1)
+
+#endif /* _LWTUNNEL_H_ */

sysdep/linux/netlink.c

@@ -31,7 +31,11 @@
 
 #include <asm/types.h>
 #include <linux/if.h>
+#ifdef HAVE_LWTUNNEL
 #include <linux/lwtunnel.h>
+#else
+#include "sysdep/linux/lwtunnel.h"
+#endif
 #include <linux/netlink.h>
 #include <linux/rtnetlink.h>