No arrays of length 0...

gtests/net/packetdrill/tun.h

@@ -111,7 +111,7 @@ struct tun_pi {
 struct tun_filter {
 	__u16  flags; /* TUN_FLT_ flags see above */
 	__u16  count; /* Number of addresses */
-	__u8   addr[0][ETH_ALEN];
+	__u8   addr[][ETH_ALEN];
 };
 
 #endif /* __TUN_H__ */