macro calls.
Producing configuration scripts using Autoconf requires GNU M4 and
-Perl. You should install GNU M4 (version 1.4.6 or later is required;
-1.4.14 or later is recommended) and Perl (5.006 or later) before
+Perl. You should install GNU M4 (version 1.4.8 or later is required;
+1.4.16 or later is recommended) and Perl (5.006 or later) before
configuring Autoconf, so that Autoconf's configure script can find
them. The configuration scripts produced by Autoconf are
self-contained, so their users do not need to have Autoconf (or GNU
- Automake 1.11+ <https://www.gnu.org/software/automake/>
- Help2man 1.29+ <https://www.gnu.org/software/help2man/>
-- M4 1.4.6+ <https://www.gnu.org/software/m4/>
+- M4 1.4.16+ <https://www.gnu.org/software/m4/>
- Perl 5.006+ <https://www.cpan.org/>
- Texinfo 4.11+ <https://www.gnu.org/software/texinfo/>
Autoconf imposes some restrictions on the names of macros used with
@code{#if} in C programs (@pxref{Preprocessor Symbol Index}).
-Autoconf requires GNU M4 version 1.4.6 or later in order to
+Autoconf requires GNU M4 version 1.4.8 or later in order to
generate the scripts. It uses features that some versions of M4,
including GNU M4 1.3, do not have. Autoconf works better
-with GNU M4 version 1.4.14 or later, though this is not
+with GNU M4 version 1.4.16 or later, though this is not
required.
@xref{Autoconf 1}, for information about upgrading from version 1.
__line__
@end example
-Autoconf requires version 1.4.6 or later of GNU M4.
+Autoconf requires version 1.4.8 or later of GNU M4.
+It works better with version 1.4.16 or later.
Since only software maintainers need to use Autoconf, and since GNU
M4 is simple to configure and install, it seems reasonable to require