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From: Denys Vlasenko <vda.linux@googlemail.com>
Newsgroups: gmane.linux.lib.musl.general
Subject: Re: musl and kernel headers [was Re: system-images 1.4.2: od is
 broken; bzip2 is missing]
Date: Tue, 6 Oct 2015 18:09:15 +0200
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Cc: Rob Landley <rob@landley.net>, Aboriginal Linux <aboriginal@lists.landley.net>, 
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To: Rich Felker <dalias@aerifal.cx>
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Xref: news.gmane.org gmane.linux.lib.musl.general:8623
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On Tue, Oct 6, 2015 at 3:44 AM, Rich Felker <dalias@aerifal.cx> wrote:
>> >
>> >   #include <netinet/in.h>
>> >   #include <linux/if_bridge.h>
>> > results in:
>> >   In file included from /usr/include/linux/if_bridge.h:18,
>> >                    from networking/brctl.c:67:
>> >   /usr/include/linux/in6.h:32: error: redefinition of 'struct in6_addr'
>> >   /usr/include/linux/in6.h:49: error: redefinition of 'struct sockaddr_in6'
>> >   /usr/include/linux/in6.h:59: error: redefinition of 'struct ipv6_mreq'
>> >
>> > and
>> >
>> >   #include <linux/ethtool.h>
>> >   #include <net/ethernet.h>
>> > results in:
>> >   In file included from /usr/include/net/ethernet.h:10,
>> >                    from networking/ifplugd.c:41:
>> >   /usr/include/netinet/if_ether.h:96: error: redefinition of 'struct ethhdr'
>> >
>>
>> That I leave to Rich. :)
>
> Including kernel headers is just really problematic. These days they
> try to make it work on glibc with a complex dance between glibc's
> headers and the kernel headers. You're likely to have the best luck by
> including the libc headers first.

brctl.c  was including <linux/if_bridge.h> after <netinet/in.h>