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From: Dan Nicolaescu <dann@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: [Emacs-diffs] /srv/bzr/emacs/trunk r101037: * configure.in
	(AC_PREREQ): Require autoconf 2.66 to stop version churn.
Date: Tue, 10 Aug 2010 08:07:42 -0400
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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Stefan Monnier <monnier@iro.umontreal.ca> writes:

>>   * configure.in (AC_PREREQ): Require autoconf 2.66 to stop version churn.
>
> What means "version churn" and why is it a problem?

When regenerating configure in the past few days 2.65 and 2.66 where
used alternatively a few times.  The large diffs generated each time
make it hard to verify that the change did not have unintended
consequences.

> Debian testing still isn't up to 2.66, so I think it's kind of early to
> move away from 2.65.

I had to install 2.66 locally too (replacing 2.65 that I also had
installed locally).  It takes about 5 seconds to install, so...