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From: Glenn Morris <rgm@gnu.org>
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Subject: Re: configure{.in,} question
Date: Mon, 25 Oct 2010 12:43:00 -0400
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Cc: Julien Danjou <julien@danjou.info>, emacs-devel@gnu.org
To: Eli Zaretskii <eliz@gnu.org>
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Eli Zaretskii wrote:

> But doing so makes sure everybody can run the configure script, even
> if the version of Autoconf installed on the user's machine has some
> bug that affects Emacs.

If we are aware of such problems, that is a legitimate reason to set
AC_PREREQ in configure.in to avoid those versions of autoconf.
We have done this in the past, although AFAIK the current prereq is
artificially high simply to stop version churn.