Update autoconf version requirement in install.texi

[Joseph S. Myers]

On Fri, 31 Oct 2014, Roland McGrath wrote:

> That should have gone with the aclocal.m4 update.  Please add a comment to

(With the aclocal.m4 change two years ago to require an exact autoconf 
version, and then with the more recent increase of that version, that is.)

> aclocal.m4 reminding one to update install.texi to match.  (Or feel free to
> get crazy with a generated file of Texinfo macros!)

I've committed this patch.

2014-10-31  Joseph Myers  <joseph@codesourcery.com>

	* aclocal.m4 (GLIBC_AUTOCONF_VERSION): Mention need to update
	install.texi in comment.

diff --git a/aclocal.m4 b/aclocal.m4
index 23569b6..abc34d2 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -1,6 +1,7 @@
 dnl We require that everyone use exactly the same Autoconf version so that
 dnl the internal functions defined and used by the main configure script
-dnl match those expected by the fragments.
+dnl match those expected by the fragments.  When changing this version,
+dnl install.texi also needs to be updated.
 m4_define([GLIBC_AUTOCONF_VERSION], [2.69])
 m4_if(m4_defn([AC_AUTOCONF_VERSION]), GLIBC_AUTOCONF_VERSION, [],
       [m4_fatal(m4_flatten(

-- 
Joseph S. Myers
joseph@codesourcery.com