From e4f91ee4cb11a10df6a61ab4ffcdc8e2da3c3483 Mon Sep 17 00:00:00 2001
From: Vincent Bernat <vincent@bernat.ch>
Date: Mon, 28 Sep 2020 16:30:56 +0200
Subject: [PATCH] Unix: fix compilation with GCC 10

Index: sysdep/unix/krt.h
--- sysdep/unix/krt.h.orig
+++ sysdep/unix/krt.h
@@ -112,7 +112,7 @@ struct kif_proto {
   struct kif_state sys;		/* Sysdep state */
 };
 
-struct kif_proto *kif_proto;
+extern struct kif_proto *kif_proto;
 
 #define KIF_CF ((struct kif_config *)p->p.cf)