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From: David Woodhouse <dwmw2@infradead.org>
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To: Alessandro Amici <alexamici@tiscali.it>
Cc: linux-kernel@vger.kernel.org, James.Bottomley@HansenPartnership.com
Subject: Re: 2.5.37+ i386 arch split broke external module builds 
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Date: Wed, 02 Oct 2002 12:28:03 +0100
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alexamici@tiscali.it said:
>  in order to access the kernel interfaces, modules that live outside
> the kernel sources were used to only need: CFLAG += -I$(TOPDIR)/
> include 

That was broken anyway -- you always got the CFLAGS wrong if you just did 
that. The only way that I only of to get the CFLAGS to match the kernel 
build reliably is to do something like:

 make -C /lib/modules/`uname -r`/build SUBDIRS=`pwd` modules

--
dwmw2