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patch 9.1.1664: configure: can use any autoconf

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Problem:  configure: can use any autocon
Solution: Use AC_PREREQ and require 2.71 (Damien Lejay)

technically, we require autoconf 2.72, but that is not available on
Ubuntu LTS 24.04. So let's go with 2.71 for now and add a comment about
it in configure.ac

closes: #18047

Signed-off-by: Damien Lejay <damien@lejay.be>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
Damien Lejay
2025-08-22 12:36:43 -04:00
committed by Christian Brabandt
parent 5ca1ea83ad
commit ea3d465438
3 changed files with 35 additions and 17 deletions
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28
src/configure.ac
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@ -1,14 +1,32 @@
dnl configure.ac: autoconf script for Vim
dnl +----------------------------------------------------------------------+
dnl configure.ac: autoconf script for Vim
dnl +----------------------------------------------------------------------+
dnl
dnl This file is processed by autoconf to generate the 'configure' script.
dnl
dnl ==> IMPORTANT NOTE FOR DEVELOPERS <==
dnl
dnl Do NOT run 'autoconf' directly on this file. You must use the provided
dnl make target, like this:
dnl
dnl make autoconf
dnl
dnl This is required because the Makefile handles placing the generated
dnl script into its final location: 'auto/configure'.
dnl
dnl +----------------------------------------------------------------------+
dnl Process this file with autoconf 2.72 to produce "configure".
dnl You should use Autoconf 2.72 but to simplify CI on Ubuntu 24.04 we only
dnl use AC_PREREQ([2.71])
AC_PREREQ([2.71])
dnl Normally, AC_INIT([package],[version],[bug-report],[tarname],[url])
dnl provides PACKAGE_* macros, used by Autoconf on UNIX to inject version
dnl info into config.h, --version output, and "make dist".
dnl
dnl Vim does not rely on that: versioning is centralized in version.h/version.c,
dnl which ensures a single cross-platform source of truth for both UNIX and
dnl non-UNIX platforms.
dnl Vim does not rely on that: versioning is centralized in
dnl version.h/version.c, dnl which ensures a single cross-platform source of
dnl truth for both UNIX and non-UNIX platforms.
dnl
dnl Therefore we call AC_INIT without arguments.
AC_INIT