From mboxrd@z Thu Jan  1 00:00:00 1970
From: Kay Sievers <kay.sievers@vrfy.org>
Date: Wed, 20 Jan 2010 18:30:15 +0000
Subject: Re: udev, input/linux.h and cross compilation
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To: linux-hotplug@vger.kernel.org

On Wed, Jan 20, 2010 at 19:21, Paul Bender <pebender@san.rr.com> wrote:
> The top level Makefile.am hard codes /usr/include/linux/input.h for use in
> the generation of extras/keymap/keys.txt. Such hard coding does not work
> when cross compiling as the linux/input.h file that should be used is the
> cross environment's linux/include.h not /usr/include/linux/input.h.
>
> I have attached a patch that determines the correct linux/include.h file
> during configure. The configure change makes use of the AX_ABOLUTE_HEADER
> http://www.nongnu.org/autoconf-archive/ax_absolute_header.html, which the
> patch adds to the m4.

Why is all this magic needed? Can't you just use:
  extras/keymap/keys.txt: $(includedir)/linux/input.h

Thanks,
Kay