Author: Eric Salama <esalama@haproxy.com>
Date:   Tue Nov 6 12:25:37 2018 +0000

    Remove an useless include that prevents compiling with gcc >= 5.
    See also https://sourceforge.net/p/net-tools/code/ci/45d573a89386c934d3ebac499d00c1670437813b

diff --git a/iptunnel.c b/iptunnel.c
index 4943d83..dae0238 100644
--- a/iptunnel.c
+++ b/iptunnel.c
@@ -26,7 +26,7 @@
 #include <sys/socket.h>
 #include <sys/ioctl.h>
 #include <netinet/in.h>
-#include <netinet/ip.h>
+#include <linux/ip.h>
 #include <arpa/inet.h>
 #if defined(__GLIBC__) && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1))
 #include <net/if.h>