+#include <linux/loop.h>
+]])
+
+AC_CHECK_DECLS([IFLA_PHYS_PORT_ID,
+ IFLA_BOND_AD_INFO,
+ IFLA_VLAN_PROTOCOL,
+ IFLA_VXLAN_LOCAL6,
+ IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
+ IFLA_BRIDGE_VLAN_INFO],
+[], [], [[
+#include <inttypes.h>
+#include <netinet/in.h>
+#include <netinet/ether.h>
+#include <linux/rtnetlink.h>
+#include <net/if.h>
+#include <linux/ip.h>
+#include <linux/if_tunnel.h>
+#include <linux/if_link.h>
+#include <linux/if_bridge.h>
+]])