AC_CHECK_HEADERS([stdint.h inttypes.h])
AC_CHECK_HEADERS([net/if.h net/route.h])
AC_CHECK_HEADERS([sys/socket.h])
-AC_CHECK_HEADERS([linux/if.h], [], [],
+AC_CHECK_HEADERS([linux/if_tun.h], [], [],
[#if HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif