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From: Bernhard Schmidt <berni@debian.org>
Subject: Fix FTBFS with headers from Linux 4.8+
Bug-Debian: https://bugs.debian.org/844869
Linux 4.8+ adds a few includes to linux/if_tunnel.h, which conflict with
concurrent use of netinet/ip.h. Drop the latter and manually define IP_DF
which is not found anywhere else
--- a/src/tunnel.c
+++ b/src/tunnel.c
@@ -18,10 +18,13 @@
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <arpa/inet.h>
-#include <netinet/ip.h>
#include <net/if.h>
#include <linux/if_tunnel.h>
+#ifndef IP_DF
+ #define IP_DF 0x4000 /* dont fragment flag */
+#endif
+
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
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