From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Fri, 15 Aug 2008 14:06:13 +0200
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai-help] Xenomai install problem?
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To: Steve Shumway <sshumway@domain.hid>
Cc: xenomai@xenomai.org

Steve Shumway wrote:
> gcc -O2 -Wall -DMODULE -D__KERNEL__ -DLINUX -I/usr/src/linux/include 
> -I/usr/src/linux/include/xenomai/compat -I/usr/xenomai/include   -c -o 
> irqcontrol_driver.o irqcontrol_driver.c

So, the compiler looks for headers in /usr/src/linux.

> tar -xvzpf linux-2.6.25 tar -C /usr/src

And you installed the kernel sources in /usr/src/linux-2.6.25

And by the way, are you trying to compile a module with gcc by hand ?
If, yes, then it is normal that you get problems. The official way to
compile modules with the 2.6 kernel is to use the way described in
/usr/src/linux-2.6.25/Documentation/kbuild/modules.txt

-- 
					    Gilles.