Oh well, Linux doesn't tell you the correct version number via

linux/version.h. At least not on Rasbian. So take out the last
change and just try to set TUN_F_UFO and ignore if it worked
or not.
This allows to run packetdrill on a Raspberry Pi running Rasbian.

gtests/net/packetdrill/netdev.c

@@ -44,9 +44,6 @@
 #if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
 #include <net/if_tun.h>
 #endif /* defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) */
-#if defined(linux)
-#include <linux/version.h>
-#endif
 
 #include "ip.h"
 #include "ipv6.h"
@@ -206,11 +203,11 @@ static void set_device_offload_flags(struct local_netdev *netdev)
 #ifdef linux
 	u32 offload = TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 | TUN_F_TSO_ECN;
 
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0)) || (LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,0))
-	offload |= TUN_F_UFO;
-#endif
 	if (ioctl(netdev->tun_fd, TUNSETOFFLOAD, offload) != 0)
 		die_perror("TUNSETOFFLOAD");
+	/* Linux 3.18 doesn't support TUN_F_UFO. So try and ignore... */
+	offload = TUN_F_UFO;
+	ioctl(netdev->tun_fd, TUNSETOFFLOAD, offload);
 #endif
 }