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Date:   Sat, 15 Oct 2016 12:40:43 +0100
From:   Pascal Terjan <pterjan@...il.com>
To:     Mikko Rapeli <mikko.rapeli@....fi>,
        "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org
Subject: userspace build broken by include changes

rp-pppoe plugin of ppp no longer builds:

In file included from pppoe.h:87:0,
                 from plugin.c:29:
/usr/include/linux/in.h:28:3: error: redeclaration of enumerator 'IPPROTO_IP'
   IPPROTO_IP = 0,  /* Dummy protocol for TCP  */
   ^
/usr/include/netinet/in.h:42:5: note: previous definition of
'IPPROTO_IP' was here
     IPPROTO_IP = 0,    /* Dummy protocol for TCP.  */

Short reproducer:

#include <sys/cdefs.h>
#include <sys/socket.h>
#include <linux/if.h>
#include <netinet/in.h>
#include <linux/ppp_defs.h>
#include <linux/if_pppox.h>

Full log:
http://pkgsubmit.mageia.org/autobuild/cauldron/x86_64/core/2016-10-12/ppp-2.4.7-8.mga6.src.rpm/build.0.20161012185227.log

Moving the include of linux/if.h after netinet/in.h fixes it.

I guess the breakage is caused by
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/include/uapi/linux?id=eafe92114308acf14e45c6c3d154a5dad5523d1a
but the commit doesn't look wrong to me.

This is indeed enough to cause the error:

#include <linux/if.h>
#include <netinet/in.h>
#include <linux/in.h>

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