Redefinition of struct in6_addr in <netinet/in.h> and <linux/in6.h>

[David Miller]

From: Mike Frysinger <vapier@gentoo.org>
Date: Wed, 16 Jan 2013 12:28:39 -0500

> if you're not calling the kernel directly, why are you including the kernel 
> headers ?  what is the problem people are actually trying to address here (and 
> no, "i want to include both headers" is not the answer) ?

When GLIBC doesn't provide it's own definition of some networking
macros or interfaces that the kernel provides, people include the
kernel header.

This has been done for decades, wake up.