From 947248af144bcab6376ccddab8dc40f313b14281 Mon Sep 17 00:00:00 2001
From: Baruch Siach <baruch@tkos.co.il>
Date: Fri, 9 Feb 2018 11:55:19 +0200
Subject: [PATCH] Fix build with Linux kernel headers v4.15

Linux kernel version 4.15 changed the libc/kernel headers suppression
logic in a way that introduces collisions:

In file included from ./../include/vrrp_ipaddress.h:32:0,
                 from ./../include/vrrp_arp.h:31,
                 from vrrp.c:29:
/home/peko/autobuild/instance-1/output/host/arc-buildroot-linux-uclibc/sysroot/usr/include/linux/in.h:29:3: error: redeclaration of enumerator 'IPPROTO_IP'
   IPPROTO_IP = 0,  /* Dummy protocol for TCP  */
   ^
/home/peko/autobuild/instance-1/output/host/arc-buildroot-linux-uclibc/sysroot/usr/include/netinet/in.h:33:5: note: previous definition of 'IPPROTO_IP' was here
     IPPROTO_IP = 0,    /* Dummy protocol for TCP.  */
     ^~~~~~~~~~

Include the libc netinet/in.h header first to suppress the kernel
header.

In addition, add _GNU_SOURCE to vrrp.c for the libc provided in6_pktinfo
definition.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
---
 keepalived/include/vrrp_arp.h | 1 +
 keepalived/vrrp/vrrp.c        | 1 +
 2 files changed, 2 insertions(+)

Index: keepalived-2.0.9/keepalived/include/vrrp_arp.h
===================================================================
--- keepalived-2.0.9.orig/keepalived/include/vrrp_arp.h
+++ keepalived-2.0.9/keepalived/include/vrrp_arp.h
@@ -24,6 +24,7 @@
 #define _VRRP_ARP_H
 
 /* system includes */
+#include <netinet/in.h>
 #include <sys/types.h>
 #include <linux/if_infiniband.h>
 
Index: keepalived-2.0.9/keepalived/vrrp/vrrp.c
===================================================================
--- keepalived-2.0.9.orig/keepalived/vrrp/vrrp.c
+++ keepalived-2.0.9/keepalived/vrrp/vrrp.c
@@ -40,6 +40,7 @@
 #include <net/ethernet.h>
 
 /* local include */
+#define _GNU_SOURCE
 #include "parser.h"
 
 #include "vrrp_arp.h"
Index: keepalived-2.0.9/keepalived/include/vrrp_if.h
===================================================================
--- keepalived-2.0.9.orig/keepalived/include/vrrp_if.h
+++ keepalived-2.0.9/keepalived/include/vrrp_if.h
@@ -33,9 +33,7 @@
 #include <sys/types.h>
 #include <net/if.h>
 #include <stdio.h>
-#ifdef _HAVE_NET_LINUX_IF_H_COLLISION_
 #define _LINUX_IF_H
-#endif
 #include <linux/netdevice.h>
 #ifdef _HAVE_VRRP_VMAC_
 #include <linux/if_link.h>