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From: Phil Blundell <philb@gnu.org>
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Date: Mon, 10 Sep 2012 14:08:56 +0100
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Subject: Re: Couple of autotools configure problems
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On Mon, 2012-09-10 at 14:00 +0100, Jack Mitchell wrote:
> What is a portable version of ':=', maybe '+='? I can't get anything but 
> unrelated hits from Google.

I don't think there is any portable equivalent.  However, if you know
you will always be using GNU make then the portability is something of a
non-issue.  

You could work around it by just not passing -Werror -Wall to automake.

p.