--- zzzz-none-000/linux-4.4.60/include/net/secure_seq.h	2017-04-08 07:53:53.000000000 +0000
+++ scorpion-1750e-727/linux-4.4.60/include/net/secure_seq.h	2021-02-04 17:41:59.000000000 +0000
@@ -2,6 +2,7 @@
 #define _NET_SECURE_SEQ
 
 #include <linux/types.h>
+#include <linux/in6.h>
 
 u32 secure_ipv4_port_ephemeral(__be32 saddr, __be32 daddr, __be16 dport);
 u32 secure_ipv6_port_ephemeral(const __be32 *saddr, const __be32 *daddr,