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From: Rich Felker <dalias@aerifal.cx>
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Subject: Re: linux/if_ether.h: struct ethhdr previously defined in
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Date: Fri, 8 Jun 2012 18:19:29 -0400
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On Sat, Jun 09, 2012 at 03:04:49AM +0800, orc wrote:
> Getting this when compiling tinc-1.0.18:
> 
> In file included from /usr/include/linux/if_tun.h:20,
>                  from device.c:24:
> /usr/include/linux/if_ether.h:126: error: redefinition of 'struct ethhdr'
> make[2]: *** [device.o] Error 1
> 
> Commenting struct ethhdr definition in netinet/if_ether.h solves the
> problem.

I'm not sure how this stuff is intended to work with other libcs, but
generally it's an error to be including both kernel headers and
userspace headers that involve the same stuff in the same source
file...

And it's probably bad design to be including linux/*.h at all...

Rich