From: Ben Hutchings <redacted>
Date: Mon, 08 Aug 2011 14:25:19 +0100

<linux/if_ppp.h> uses various types defined in <linux/ppp_defs.h>.

Signed-off-by: Ben Hutchings <redacted>

Unfortunately there is a "net/if_ppp.h" provided by glibc that
includes "net/ppp_defs.h", and all of this is presumably in order
to discourage direct use of the kernel headers.

Even though net/ppp_defs.h ends up including linux/ppp_defs.h
anyways.

Whilst I think your efforts are to be commended, we can't start doing
or else we'll start breaking the build in various unexpected ways.

The SIOCDEVPRIVATE (defined by GLIBC in bits/ioctls.h) case is just
one such example.