maint: update all copyright dates via "make update-copyright"
diff --git a/AUTHORS b/AUTHORS
index 9ec5066..90c1883 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -111,7 +111,7 @@
coding: utf-8
End:
-Copyright (C) 1996, 2000-2001, 2005, 2007-2017, 2020-2025 Free Software
+Copyright (C) 1996, 2000-2001, 2005, 2007-2017, 2020-2026 Free Software
Foundation, Inc.
This program is free software: you can redistribute it and/or modify
diff --git a/BUGS b/BUGS
index 0237f6d..168bd4b 100644
--- a/BUGS
+++ b/BUGS
@@ -3,7 +3,7 @@
This file lists the bugs you must be aware of. Be sure to check this
file before using Autoconf, and especially git versions of Autoconf.
- Copyright (C) 2000-2002, 2006-2017, 2020-2025 Free Software
+ Copyright (C) 2000-2002, 2006-2017, 2020-2026 Free Software
Foundation, Inc.
Copying and distribution of this file, with or without
diff --git a/HACKING b/HACKING
index bd25ded..45fd80a 100644
--- a/HACKING
+++ b/HACKING
@@ -155,7 +155,7 @@
-----
-Copyright (C) 2002, 2008-2017, 2020-2025 Free Software Foundation, Inc.
+Copyright (C) 2002, 2008-2017, 2020-2026 Free Software Foundation, Inc.
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
diff --git a/Makefile.am b/Makefile.am
index 07642ba..2e270be 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,6 +1,6 @@
# Make Autoconf.
-# Copyright (C) 1999-2004, 2006-2017, 2020-2025 Free Software
+# Copyright (C) 1999-2004, 2006-2017, 2020-2026 Free Software
# Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
diff --git a/NEWS b/NEWS
index fb6762a..3ebeaba 100644
--- a/NEWS
+++ b/NEWS
@@ -2851,7 +2851,7 @@
-----
-Copyright (C) 1993-1996, 1998-2017, 2020-2025 Free Software Foundation,
+Copyright (C) 1993-1996, 1998-2017, 2020-2026 Free Software Foundation,
Inc.
Copying and distribution of this file, with or without modification,
diff --git a/README b/README
index f97de19..251dcf2 100644
--- a/README
+++ b/README
@@ -76,7 +76,7 @@
-----
-Copyright (C) 1992-1994, 1998, 2000-2017, 2020-2025 Free Software
+Copyright (C) 1992-1994, 1998, 2000-2017, 2020-2026 Free Software
Foundation, Inc.
Copying and distribution of this file, with or without modification,
diff --git a/README-alpha b/README-alpha
index cef260d..811bc74 100644
--- a/README-alpha
+++ b/README-alpha
@@ -22,7 +22,7 @@
-----
-Copyright (C) 2000-2003, 2009-2017, 2020-2025 Free Software Foundation,
+Copyright (C) 2000-2003, 2009-2017, 2020-2026 Free Software Foundation,
Inc.
Copying and distribution of this file, with or without modification,
diff --git a/README-hacking b/README-hacking
index 6598964..4c6b8c4 100644
--- a/README-hacking
+++ b/README-hacking
@@ -137,7 +137,7 @@
-----
-Copyright (C) 2002-2017, 2020-2025 Free Software Foundation, Inc.
+Copyright (C) 2002-2017, 2020-2026 Free Software Foundation, Inc.
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
diff --git a/THANKS b/THANKS
index 9d89bc5..cb53622 100644
--- a/THANKS
+++ b/THANKS
@@ -459,7 +459,7 @@
coding: utf-8
End:
-Copyright (C) 1999-2017, 2020-2025 Free Software Foundation, Inc.
+Copyright (C) 1999-2017, 2020-2026 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
diff --git a/TODO b/TODO
index 66ad757..563ae53 100644
--- a/TODO
+++ b/TODO
@@ -591,7 +591,7 @@
------------------------------------------------------------------------------
-Copyright (C) 1994-1996, 1999-2002, 2007-2017, 2020-2025 Free Software
+Copyright (C) 1994-1996, 1999-2002, 2007-2017, 2020-2026 Free Software
Foundation, Inc.
Copying and distribution of this file, with or without modification,
diff --git a/bin/autoconf.in b/bin/autoconf.in
index 8979b94..cbf41b6 100644
--- a/bin/autoconf.in
+++ b/bin/autoconf.in
@@ -7,7 +7,7 @@
# autoconf -- create 'configure' using m4 macros.
-# Copyright (C) 1992-1994, 1996, 1999-2017, 2020-2025 Free Software
+# Copyright (C) 1992-1994, 1996, 1999-2017, 2020-2026 Free Software
# Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
diff --git a/bin/autoheader.in b/bin/autoheader.in
index c2509a1..7fea875 100644
--- a/bin/autoheader.in
+++ b/bin/autoheader.in
@@ -7,7 +7,7 @@
# autoheader -- create 'config.h.in' from 'configure.ac'.
-# Copyright (C) 1992-1994, 1996, 1998-2017, 2020-2025 Free Software
+# Copyright (C) 1992-1994, 1996, 1998-2017, 2020-2026 Free Software
# Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
diff --git a/bin/autom4te.in b/bin/autom4te.in
index 354b29d..0f091fe 100644
--- a/bin/autom4te.in
+++ b/bin/autom4te.in
@@ -6,7 +6,7 @@
if 0;
# autom4te - Wrapper around M4 libraries.
-# Copyright (C) 2001-2003, 2005-2017, 2020-2025 Free Software
+# Copyright (C) 2001-2003, 2005-2017, 2020-2026 Free Software
# Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
diff --git a/bin/autoreconf.in b/bin/autoreconf.in
index a5ffc6f..668dc30 100644
--- a/bin/autoreconf.in
+++ b/bin/autoreconf.in
@@ -6,7 +6,7 @@
if 0;
# autoreconf - install the GNU Build System in a directory tree
-# Copyright (C) 1994, 1999-2017, 2020-2025 Free Software Foundation,
+# Copyright (C) 1994, 1999-2017, 2020-2026 Free Software Foundation,
# Inc.
# This program is free software: you can redistribute it and/or modify
diff --git a/bin/autoscan.in b/bin/autoscan.in
index 2927ed3..cc45b60 100644
--- a/bin/autoscan.in
+++ b/bin/autoscan.in
@@ -3,7 +3,7 @@
# @configure_input@
# autoscan - Create configure.scan (a preliminary configure.ac) for a package.
-# Copyright (C) 1994, 1999-2017, 2020-2025 Free Software Foundation,
+# Copyright (C) 1994, 1999-2017, 2020-2026 Free Software Foundation,
# Inc.
# This program is free software: you can redistribute it and/or modify
diff --git a/bin/autoupdate.in b/bin/autoupdate.in
index c4e3f30..c668556 100644
--- a/bin/autoupdate.in
+++ b/bin/autoupdate.in
@@ -3,7 +3,7 @@
# @configure_input@
# autoupdate - modernize an Autoconf file.
-# Copyright (C) 1994, 1999-2017, 2020-2025 Free Software Foundation,
+# Copyright (C) 1994, 1999-2017, 2020-2026 Free Software Foundation,
# Inc.
# This program is free software: you can redistribute it and/or modify
diff --git a/bin/ifnames.in b/bin/ifnames.in
index 3d3d81d..1b86ac0 100644
--- a/bin/ifnames.in
+++ b/bin/ifnames.in
@@ -7,7 +7,7 @@
# ifnames - print the identifiers used in C preprocessor conditionals
-# Copyright (C) 1994-1995, 1999-2003, 2005-2017, 2020-2025 Free Software
+# Copyright (C) 1994-1995, 1999-2003, 2005-2017, 2020-2026 Free Software
# Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
diff --git a/bin/local.mk b/bin/local.mk
index b9d242f..021e551 100644
--- a/bin/local.mk
+++ b/bin/local.mk
@@ -1,6 +1,6 @@
# Make Autoconf commands.
-# Copyright (C) 1999-2007, 2009-2017, 2020-2025 Free Software
+# Copyright (C) 1999-2007, 2009-2017, 2020-2026 Free Software
# Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
diff --git a/bootstrap b/bootstrap
index c148bcb..6d6b98d 100755
--- a/bootstrap
+++ b/bootstrap
@@ -2,7 +2,7 @@
# This script helps bootstrap autoconf, when checked out from git.
#
-# Copyright (C) 2021-2025 Free Software Foundation, Inc.
+# Copyright (C) 2021-2026 Free Software Foundation, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
diff --git a/build-aux/fetch.pl b/build-aux/fetch.pl
index 3f64e8b..d8a3051 100755
--- a/build-aux/fetch.pl
+++ b/build-aux/fetch.pl
@@ -1,5 +1,5 @@
#! /usr/bin/perl
-# Copyright (C) 2020-2025 Free Software Foundation, Inc.
+# Copyright (C) 2020-2026 Free Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
diff --git a/build-aux/help-extract.pl b/build-aux/help-extract.pl
index ed3807a..bf6c722 100644
--- a/build-aux/help-extract.pl
+++ b/build-aux/help-extract.pl
@@ -1,5 +1,5 @@
# help-extract -- extract --help and --version output from a script.
-# Copyright (C) 2020-2025 Free Software Foundation, Inc.
+# Copyright (C) 2020-2026 Free Software Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
diff --git a/cfg.mk b/cfg.mk
index 3ac023a..e800ad3 100644
--- a/cfg.mk
+++ b/cfg.mk
@@ -1,5 +1,5 @@
# Customize maint.mk for Autoconf. -*- Makefile -*-
-# Copyright (C) 2003-2004, 2006, 2008-2017, 2020-2025 Free Software
+# Copyright (C) 2003-2004, 2006, 2008-2017, 2020-2026 Free Software
# Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
diff --git a/configure.ac b/configure.ac
index 45b4828..956af51 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,7 +1,7 @@
# -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.
-# Copyright (C) 1992-1995, 1999-2017, 2020-2025 Free Software
+# Copyright (C) 1992-1995, 1999-2017, 2020-2026 Free Software
# Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
@@ -38,7 +38,7 @@
# Keep this on a line of its own, since it must be found and processed
# by the 'update-release-year' rule in our Makefile.
-RELEASE_YEAR=2025
+RELEASE_YEAR=2026
AC_SUBST([RELEASE_YEAR])
AB_INIT
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 20e03d5..6d51c8a 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -211,7 +211,7 @@
a package for creating scripts to configure source code packages using
templates and an M4 macro package.
-Copyright @copyright{} 1992--1996, 1998--2017, 2020--2025 Free Software
+Copyright @copyright{} 1992--1996, 1998--2017, 2020--2026 Free Software
Foundation, Inc.
@quotation
diff --git a/doc/install.texi b/doc/install.texi
index 98eebe3..8cb21c6 100644
--- a/doc/install.texi
+++ b/doc/install.texi
@@ -479,7 +479,7 @@
@node Copyright notice
@section Copyright notice
-Copyright @copyright{} 1994--1996, 1999--2002, 2004--2017, 2020--2025
+Copyright @copyright{} 1994--1996, 1999--2002, 2004--2017, 2020--2026
Free Software Foundation, Inc.
Copying and distribution of this file, with or without modification, are
diff --git a/doc/local.mk b/doc/local.mk
index 02640da..b64ebbc 100644
--- a/doc/local.mk
+++ b/doc/local.mk
@@ -1,6 +1,6 @@
# Make Autoconf documentation.
-# Copyright (C) 2000-2003, 2007-2017, 2020-2025 Free Software
+# Copyright (C) 2000-2003, 2007-2017, 2020-2026 Free Software
# Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
diff --git a/lib/Autom4te/C4che.pm b/lib/Autom4te/C4che.pm
index 2c69463..b3fc687 100644
--- a/lib/Autom4te/C4che.pm
+++ b/lib/Autom4te/C4che.pm
@@ -1,5 +1,5 @@
# autoconf -- create 'configure' using m4 macros
-# Copyright (C) 2003, 2006, 2009-2017, 2020-2025 Free Software
+# Copyright (C) 2003, 2006, 2009-2017, 2020-2026 Free Software
# Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
diff --git a/lib/Autom4te/Config.pm b/lib/Autom4te/Config.pm
index 0a11359..5932d7c 100644
--- a/lib/Autom4te/Config.pm
+++ b/lib/Autom4te/Config.pm
@@ -1,5 +1,5 @@
# -*- Perl -*-
-# Copyright (C) 2003-2025 Free Software Foundation, Inc.
+# Copyright (C) 2003-2026 Free Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
diff --git a/lib/Autom4te/General.pm b/lib/Autom4te/General.pm
index 06cf845..03be26d 100644
--- a/lib/Autom4te/General.pm
+++ b/lib/Autom4te/General.pm
@@ -1,5 +1,5 @@
# autoconf -- create 'configure' using m4 macros
-# Copyright (C) 2001-2004, 2006-2007, 2009-2017, 2020-2025 Free Software
+# Copyright (C) 2001-2004, 2006-2007, 2009-2017, 2020-2026 Free Software
# Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
diff --git a/lib/Autom4te/Request.pm b/lib/Autom4te/Request.pm
index 4121366..ce8e75e 100644
--- a/lib/Autom4te/Request.pm
+++ b/lib/Autom4te/Request.pm
@@ -1,5 +1,5 @@
# autoconf -- create 'configure' using m4 macros
-# Copyright (C) 2001-2003, 2009-2017, 2020-2025 Free Software
+# Copyright (C) 2001-2003, 2009-2017, 2020-2026 Free Software
# Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
diff --git a/lib/autoconf/a68.m4 b/lib/autoconf/a68.m4
index 12d366c..96aee3f 100644
--- a/lib/autoconf/a68.m4
+++ b/lib/autoconf/a68.m4
@@ -1,6 +1,6 @@
# This file is part of Autoconf. -*- Autoconf -*-
# Algol 68 language support.
-# Copyright 2025 Free Software Foundation, Inc.
+# Copyright 2025-2026 Free Software Foundation, Inc.
# This file is part of Autoconf. This program is free
# software; you can redistribute it and/or modify it under the
diff --git a/lib/autoconf/autoconf.m4 b/lib/autoconf/autoconf.m4
index d79888e..79eaa13 100644
--- a/lib/autoconf/autoconf.m4
+++ b/lib/autoconf/autoconf.m4
@@ -1,7 +1,7 @@
# This file is part of Autoconf. -*- Autoconf -*-
# Driver that loads the Autoconf macro files.
#
-# Copyright (C) 1994, 1999-2002, 2006, 2008-2017, 2020-2025 Free
+# Copyright (C) 1994, 1999-2002, 2006, 2008-2017, 2020-2026 Free
# Software Foundation, Inc.
# This file is part of Autoconf. This program is free
diff --git a/lib/autoconf/autoheader.m4 b/lib/autoconf/autoheader.m4
index ee52515..0821447 100644
--- a/lib/autoconf/autoheader.m4
+++ b/lib/autoconf/autoheader.m4
@@ -1,7 +1,7 @@
# This file is part of Autoconf. -*- Autoconf -*-
# Interface with autoheader.
-# Copyright (C) 1992-1996, 1998-2002, 2008-2017, 2020-2025 Free Software
+# Copyright (C) 1992-1996, 1998-2002, 2008-2017, 2020-2026 Free Software
# Foundation, Inc.
# This file is part of Autoconf. This program is free
diff --git a/lib/autoconf/autoscan.m4 b/lib/autoconf/autoscan.m4
index da3be69..dee40a3 100644
--- a/lib/autoconf/autoscan.m4
+++ b/lib/autoconf/autoscan.m4
@@ -1,7 +1,7 @@
# This file is part of Autoconf. -*- Autoconf -*-
# Interface with autoscan.
-# Copyright (C) 2002, 2009-2017, 2020-2025 Free Software Foundation,
+# Copyright (C) 2002, 2009-2017, 2020-2026 Free Software Foundation,
# Inc.
# This file is part of Autoconf. This program is free
diff --git a/lib/autoconf/autotest.m4 b/lib/autoconf/autotest.m4
index 515f5b4..9f5ad91 100644
--- a/lib/autoconf/autotest.m4
+++ b/lib/autoconf/autotest.m4
@@ -1,6 +1,6 @@
# This file is part of Autoconf. -*- Autoconf -*-
# Interface with Autotest.
-# Copyright (C) 1992-1996, 1998-2005, 2009-2017, 2020-2025 Free Software
+# Copyright (C) 1992-1996, 1998-2005, 2009-2017, 2020-2026 Free Software
# Foundation, Inc.
# This file is part of Autoconf. This program is free
diff --git a/lib/autoconf/autoupdate.m4 b/lib/autoconf/autoupdate.m4
index 5af7f15..82cf9d6 100644
--- a/lib/autoconf/autoupdate.m4
+++ b/lib/autoconf/autoupdate.m4
@@ -2,7 +2,7 @@
# Interface with autoupdate.
# Copyright (C) 1992-1996, 1998-2001, 2003-2004, 2006, 2009-2017,
-# 2020-2025 Free Software Foundation, Inc.
+# 2020-2026 Free Software Foundation, Inc.
# This file is part of Autoconf. This program is free
# software; you can redistribute it and/or modify it under the
diff --git a/lib/autoconf/c.m4 b/lib/autoconf/c.m4
index 689e506..4771b2c 100644
--- a/lib/autoconf/c.m4
+++ b/lib/autoconf/c.m4
@@ -1,6 +1,6 @@
# This file is part of Autoconf. -*- Autoconf -*-
# Programming languages support.
-# Copyright (C) 2001-2017, 2020-2025 Free Software Foundation, Inc.
+# Copyright (C) 2001-2017, 2020-2026 Free Software Foundation, Inc.
# This file is part of Autoconf. This program is free
# software; you can redistribute it and/or modify it under the
diff --git a/lib/autoconf/erlang.m4 b/lib/autoconf/erlang.m4
index ae6d2eb..861918c 100644
--- a/lib/autoconf/erlang.m4
+++ b/lib/autoconf/erlang.m4
@@ -1,6 +1,6 @@
# This file is part of Autoconf. -*- Autoconf -*-
# Erlang/OTP language support.
-# Copyright (C) 2006, 2008-2017, 2020-2025 Free Software Foundation,
+# Copyright (C) 2006, 2008-2017, 2020-2026 Free Software Foundation,
# Inc.
# This file is part of Autoconf. This program is free
diff --git a/lib/autoconf/fortran.m4 b/lib/autoconf/fortran.m4
index 09459f0..87e00cc 100644
--- a/lib/autoconf/fortran.m4
+++ b/lib/autoconf/fortran.m4
@@ -1,6 +1,6 @@
# This file is part of Autoconf. -*- Autoconf -*-
# Fortran languages support.
-# Copyright (C) 2001, 2003-2017, 2020-2025 Free Software Foundation,
+# Copyright (C) 2001, 2003-2017, 2020-2026 Free Software Foundation,
# Inc.
# This file is part of Autoconf. This program is free
diff --git a/lib/autoconf/functions.m4 b/lib/autoconf/functions.m4
index 6ec892a..c0472d0 100644
--- a/lib/autoconf/functions.m4
+++ b/lib/autoconf/functions.m4
@@ -1,6 +1,6 @@
# This file is part of Autoconf. -*- Autoconf -*-
# Checking for functions.
-# Copyright (C) 2000-2017, 2020-2025 Free Software Foundation, Inc.
+# Copyright (C) 2000-2017, 2020-2026 Free Software Foundation, Inc.
# This file is part of Autoconf. This program is free
# software; you can redistribute it and/or modify it under the
diff --git a/lib/autoconf/general.m4 b/lib/autoconf/general.m4
index cbc997f..e94f9b0 100644
--- a/lib/autoconf/general.m4
+++ b/lib/autoconf/general.m4
@@ -1,7 +1,7 @@
# This file is part of Autoconf. -*- Autoconf -*-
# Parameterized macros.
m4_define([_AC_COPYRIGHT_YEARS], [
-Copyright (C) 1992-1996, 1998-2017, 2020-2025 Free Software Foundation,
+Copyright (C) 1992-1996, 1998-2017, 2020-2026 Free Software Foundation,
Inc.
])
diff --git a/lib/autoconf/go.m4 b/lib/autoconf/go.m4
index ec4cb7b..d9b8915 100644
--- a/lib/autoconf/go.m4
+++ b/lib/autoconf/go.m4
@@ -1,6 +1,6 @@
# This file is part of Autoconf. -*- Autoconf -*-
# Go language support.
-# Copyright (C) 2011-2017, 2020-2025 Free Software Foundation, Inc.
+# Copyright (C) 2011-2017, 2020-2026 Free Software Foundation, Inc.
# This file is part of Autoconf. This program is free
# software; you can redistribute it and/or modify it under the
diff --git a/lib/autoconf/headers.m4 b/lib/autoconf/headers.m4
index cdba5f5..9d6609f 100644
--- a/lib/autoconf/headers.m4
+++ b/lib/autoconf/headers.m4
@@ -1,7 +1,7 @@
# This file is part of Autoconf. -*- Autoconf -*-
# Checking for headers.
#
-# Copyright (C) 1988, 1999-2004, 2006, 2008-2017, 2020-2025 Free
+# Copyright (C) 1988, 1999-2004, 2006, 2008-2017, 2020-2026 Free
# Software Foundation, Inc.
# This file is part of Autoconf. This program is free
diff --git a/lib/autoconf/lang.m4 b/lib/autoconf/lang.m4
index 623ceca..ac8891e 100644
--- a/lib/autoconf/lang.m4
+++ b/lib/autoconf/lang.m4
@@ -1,6 +1,6 @@
# This file is part of Autoconf. -*- Autoconf -*-
# Programming languages support.
-# Copyright (C) 2000-2002, 2004-2017, 2020-2025 Free Software
+# Copyright (C) 2000-2002, 2004-2017, 2020-2026 Free Software
# Foundation, Inc.
# This file is part of Autoconf. This program is free
diff --git a/lib/autoconf/libs.m4 b/lib/autoconf/libs.m4
index 6bfd9f8..a71ae63 100644
--- a/lib/autoconf/libs.m4
+++ b/lib/autoconf/libs.m4
@@ -1,6 +1,6 @@
# This file is part of Autoconf. -*- Autoconf -*-
# Checking for libraries.
-# Copyright (C) 1992-1996, 1998-2006, 2008-2017, 2020-2025 Free Software
+# Copyright (C) 1992-1996, 1998-2006, 2008-2017, 2020-2026 Free Software
# Foundation, Inc.
# This file is part of Autoconf. This program is free
diff --git a/lib/autoconf/oldnames.m4 b/lib/autoconf/oldnames.m4
index 0d2e478..c302567 100644
--- a/lib/autoconf/oldnames.m4
+++ b/lib/autoconf/oldnames.m4
@@ -1,6 +1,6 @@
# This file is part of Autoconf. -*- Autoconf -*-
# Support old macros, and provide automated updates.
-# Copyright (C) 1994, 1999-2001, 2003, 2009-2017, 2020-2025 Free
+# Copyright (C) 1994, 1999-2001, 2003, 2009-2017, 2020-2026 Free
# Software Foundation, Inc.
# This file is part of Autoconf. This program is free
diff --git a/lib/autoconf/programs.m4 b/lib/autoconf/programs.m4
index d8b8b8b..332a72b 100644
--- a/lib/autoconf/programs.m4
+++ b/lib/autoconf/programs.m4
@@ -1,7 +1,7 @@
# This file is part of Autoconf. -*- Autoconf -*-
# Checking for programs.
-# Copyright (C) 1992-1996, 1998-2017, 2020-2025 Free Software
+# Copyright (C) 1992-1996, 1998-2017, 2020-2026 Free Software
# Foundation, Inc.
# This file is part of Autoconf. This program is free
diff --git a/lib/autoconf/specific.m4 b/lib/autoconf/specific.m4
index ecd6ab5..38e9bfa 100644
--- a/lib/autoconf/specific.m4
+++ b/lib/autoconf/specific.m4
@@ -1,7 +1,7 @@
# This file is part of Autoconf. -*- Autoconf -*-
# Macros that test for specific, unclassified, features.
#
-# Copyright (C) 1992-1996, 1998-2017, 2020-2025 Free Software
+# Copyright (C) 1992-1996, 1998-2017, 2020-2026 Free Software
# Foundation, Inc.
# This file is part of Autoconf. This program is free
diff --git a/lib/autoconf/status.m4 b/lib/autoconf/status.m4
index 0ac451d..3836a45 100644
--- a/lib/autoconf/status.m4
+++ b/lib/autoconf/status.m4
@@ -1,6 +1,6 @@
# This file is part of Autoconf. -*- Autoconf -*-
# Parameterizing and creating config.status.
-# Copyright (C) 1992-1996, 1998-2017, 2020-2025 Free Software
+# Copyright (C) 1992-1996, 1998-2017, 2020-2026 Free Software
# Foundation, Inc.
# This file is part of Autoconf. This program is free
diff --git a/lib/autoconf/types.m4 b/lib/autoconf/types.m4
index d80303a..be0fac5 100644
--- a/lib/autoconf/types.m4
+++ b/lib/autoconf/types.m4
@@ -1,7 +1,7 @@
# This file is part of Autoconf. -*- Autoconf -*-
# Type related macros: existence, sizeof, and structure members.
#
-# Copyright (C) 2000-2002, 2004-2017, 2020-2025 Free Software
+# Copyright (C) 2000-2002, 2004-2017, 2020-2026 Free Software
# Foundation, Inc.
# This file is part of Autoconf. This program is free
diff --git a/lib/autom4te.in b/lib/autom4te.in
index 8407712..7fae4a4 100644
--- a/lib/autom4te.in
+++ b/lib/autom4te.in
@@ -1,6 +1,6 @@
# Definition of Autom4te option sets. -*- Makefile -*-
#
-# Copyright (C) 2001-2017, 2020-2025 Free Software Foundation, Inc.
+# Copyright (C) 2001-2017, 2020-2026 Free Software Foundation, Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
diff --git a/lib/autoscan/autoscan.pre b/lib/autoscan/autoscan.pre
index 69250c5..dcbbe4f 100644
--- a/lib/autoscan/autoscan.pre
+++ b/lib/autoscan/autoscan.pre
@@ -1,5 +1,5 @@
# autoscan's mapping to Autoconf macros -*- Makefile -*-
-# Copyright (C) 1992-1994, 1996, 1999-2002, 2009-2017, 2020-2025 Free
+# Copyright (C) 1992-1994, 1996, 1999-2002, 2009-2017, 2020-2026 Free
# Software Foundation, Inc.
#
# This program is free software: you can redistribute it and/or modify
diff --git a/lib/autotest/autotest.m4 b/lib/autotest/autotest.m4
index 6890706..f55206a 100644
--- a/lib/autotest/autotest.m4
+++ b/lib/autotest/autotest.m4
@@ -1,6 +1,6 @@
# This file is part of Autoconf. -*- Autoconf -*-
# M4 macros used in building test suites.
-# Copyright (C) 2000-2002, 2009-2017, 2020-2025 Free Software
+# Copyright (C) 2000-2002, 2009-2017, 2020-2026 Free Software
# Foundation, Inc.
# This file is part of Autoconf. This program is free
diff --git a/lib/autotest/general.m4 b/lib/autotest/general.m4
index fa8c7a6..889c052 100644
--- a/lib/autotest/general.m4
+++ b/lib/autotest/general.m4
@@ -1,7 +1,7 @@
# This file is part of Autoconf. -*- Autoconf -*-
# M4 macros used in building test suites.
m4_define([_AT_COPYRIGHT_YEARS], [
-Copyright (C) 2000-2017, 2020-2025 Free Software Foundation, Inc.
+Copyright (C) 2000-2017, 2020-2026 Free Software Foundation, Inc.
])
# This file is part of Autoconf. This program is free
diff --git a/lib/autotest/specific.m4 b/lib/autotest/specific.m4
index 0e8078c..f581a1f 100644
--- a/lib/autotest/specific.m4
+++ b/lib/autotest/specific.m4
@@ -1,7 +1,7 @@
# This file is part of Autoconf. -*- Autoconf -*-
# M4 macros used in running tests using third-party testing tools.
m4_define([_AT_COPYRIGHT_YEARS],
-[Copyright (C) 2009-2017, 2020-2025 Free Software Foundation, Inc.])
+[Copyright (C) 2009-2017, 2020-2026 Free Software Foundation, Inc.])
# This file is part of Autoconf. This program is free
# software; you can redistribute it and/or modify it under the
diff --git a/lib/emacs/autoconf-mode.el b/lib/emacs/autoconf-mode.el
index 3b93fb1..3f171bc 100644
--- a/lib/emacs/autoconf-mode.el
+++ b/lib/emacs/autoconf-mode.el
@@ -6,7 +6,7 @@
;; This file is part of Autoconf
-;; Copyright (C) 2001, 2006, 2009-2017, 2020-2025 Free Software
+;; Copyright (C) 2001, 2006, 2009-2017, 2020-2026 Free Software
;; Foundation, Inc.
;;
;; This program is free software: you can redistribute it and/or modify
diff --git a/lib/emacs/autotest-mode.el b/lib/emacs/autotest-mode.el
index d5a52c9..758a274 100644
--- a/lib/emacs/autotest-mode.el
+++ b/lib/emacs/autotest-mode.el
@@ -5,7 +5,7 @@
;; This file is part of Autoconf
-;; Copyright (C) 2001, 2009-2017, 2020-2025 Free Software Foundation,
+;; Copyright (C) 2001, 2009-2017, 2020-2026 Free Software Foundation,
;; Inc.
;;
;; This program is free software: you can redistribute it and/or modify
diff --git a/lib/freeze.mk b/lib/freeze.mk
index 9535306..b194c38 100644
--- a/lib/freeze.mk
+++ b/lib/freeze.mk
@@ -1,6 +1,6 @@
# Freeze M4 files.
-# Copyright (C) 2002, 2004, 2006-2017, 2020-2025 Free Software
+# Copyright (C) 2002, 2004, 2006-2017, 2020-2026 Free Software
# Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
diff --git a/lib/local.mk b/lib/local.mk
index 62440dd..5490fd5 100644
--- a/lib/local.mk
+++ b/lib/local.mk
@@ -1,6 +1,6 @@
# Make Autoconf-related libraries.
-# Copyright (C) 2001-2005, 2009-2017, 2020-2025 Free Software
+# Copyright (C) 2001-2005, 2009-2017, 2020-2026 Free Software
# Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
diff --git a/lib/m4sugar/foreach.m4 b/lib/m4sugar/foreach.m4
index 889a147..aa42a85 100644
--- a/lib/m4sugar/foreach.m4
+++ b/lib/m4sugar/foreach.m4
@@ -4,7 +4,7 @@
# Speeds up GNU M4 1.4.x by avoiding quadratic $@ recursion, but penalizes
# GNU M4 1.6 by requiring more memory and macro expansions.
#
-# Copyright (C) 2008-2017, 2020-2025 Free Software Foundation, Inc.
+# Copyright (C) 2008-2017, 2020-2026 Free Software Foundation, Inc.
# This file is part of Autoconf. This program is free
# software; you can redistribute it and/or modify it under the
diff --git a/lib/m4sugar/m4sh.m4 b/lib/m4sugar/m4sh.m4
index ca8db79..372ebdd 100644
--- a/lib/m4sugar/m4sh.m4
+++ b/lib/m4sugar/m4sh.m4
@@ -2,7 +2,7 @@
# M4 sugar for common shell constructs.
# Requires GNU M4 and M4sugar.
#
-# Copyright (C) 2000-2017, 2020-2025 Free Software Foundation, Inc.
+# Copyright (C) 2000-2017, 2020-2026 Free Software Foundation, Inc.
# This file is part of Autoconf. This program is free
# software; you can redistribute it and/or modify it under the
diff --git a/lib/m4sugar/m4sugar.m4 b/lib/m4sugar/m4sugar.m4
index 02c76a8..0796099 100644
--- a/lib/m4sugar/m4sugar.m4
+++ b/lib/m4sugar/m4sugar.m4
@@ -3,7 +3,7 @@
# Base M4 layer.
# Requires GNU M4.
#
-# Copyright (C) 1999-2017, 2020-2025 Free Software Foundation, Inc.
+# Copyright (C) 1999-2017, 2020-2026 Free Software Foundation, Inc.
# This file is part of Autoconf. This program is free
# software; you can redistribute it and/or modify it under the
diff --git a/lib/version.in b/lib/version.in
index 3f88175..1575c35 100644
--- a/lib/version.in
+++ b/lib/version.in
@@ -1,6 +1,6 @@
# Version information for -*- Autoconf -*-.
# @configure_input@
-# Copyright (C) 1999-2002, 2006-2007, 2009, 2021-2025 Free Software
+# Copyright (C) 1999-2002, 2006-2007, 2009, 2021-2026 Free Software
# Foundation, Inc.
m4_define([m4_PACKAGE_NAME], [@PACKAGE_NAME@])
diff --git a/m4/m4.m4 b/m4/m4.m4
index 32bef11..629c4aa 100644
--- a/m4/m4.m4
+++ b/m4/m4.m4
@@ -1,6 +1,6 @@
# m4.m4 serial 13
-# Copyright (C) 2000, 2006-2017, 2020-2025 Free Software Foundation,
+# Copyright (C) 2000, 2006-2017, 2020-2026 Free Software Foundation,
# Inc.
# Copying and distribution of this file, with or without modification,
diff --git a/m4/make-case.m4 b/m4/make-case.m4
index 1610c7b..965602e 100644
--- a/m4/make-case.m4
+++ b/m4/make-case.m4
@@ -1,6 +1,6 @@
# make-case.m4 serial 1
-# Copyright (C) 2008-2017, 2020-2025 Free Software Foundation, Inc.
+# Copyright (C) 2008-2017, 2020-2026 Free Software Foundation, Inc.
# Copying and distribution of this file, with or without modification,
# are permitted in any medium without royalty provided the notice and
diff --git a/man/local.mk b/man/local.mk
index 870e88c..fa5bfaa 100644
--- a/man/local.mk
+++ b/man/local.mk
@@ -1,6 +1,6 @@
# Make Autoconf man pages.
-# Copyright (C) 2001, 2004-2017, 2020-2025 Free Software Foundation,
+# Copyright (C) 2001, 2004-2017, 2020-2026 Free Software Foundation,
# Inc.
# This program is free software: you can redistribute it and/or modify
diff --git a/tests/a68.at b/tests/a68.at
index e9ac00f..fe6993e 100644
--- a/tests/a68.at
+++ b/tests/a68.at
@@ -2,7 +2,7 @@
AT_BANNER([Algol 68 low level compiling and utility macros.])
-# Copyright (C) 2025 Free Software Foundation, Inc.
+# Copyright (C) 2025-2026 Free Software Foundation, Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
diff --git a/tests/atlocal.in b/tests/atlocal.in
index ea1677e..6acc468 100644
--- a/tests/atlocal.in
+++ b/tests/atlocal.in
@@ -2,7 +2,7 @@
# @configure_input@
# Configurable variable values for Autoconf test suite.
-# Copyright (C) 2000-2001, 2005, 2008-2017, 2020-2025 Free Software
+# Copyright (C) 2000-2001, 2005, 2008-2017, 2020-2026 Free Software
# Foundation, Inc.
#
# This program is free software: you can redistribute it and/or modify
diff --git a/tests/autoscan.at b/tests/autoscan.at
index f65c8f3..2e7d0e3 100644
--- a/tests/autoscan.at
+++ b/tests/autoscan.at
@@ -2,7 +2,7 @@
AT_BANNER([Autoscan.])
-# Copyright (C) 2005, 2009-2017, 2020-2025 Free Software Foundation,
+# Copyright (C) 2005, 2009-2017, 2020-2026 Free Software Foundation,
# Inc.
#
# This program is free software: you can redistribute it and/or modify
diff --git a/tests/autotest.at b/tests/autotest.at
index 24de2ae..37df15b 100644
--- a/tests/autotest.at
+++ b/tests/autotest.at
@@ -2,7 +2,7 @@
AT_BANNER([Autotest.])
-# Copyright (C) 2004-2017, 2020-2025 Free Software Foundation, Inc.
+# Copyright (C) 2004-2017, 2020-2026 Free Software Foundation, Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
diff --git a/tests/base.at b/tests/base.at
index 5ef3d9e..ab5f7b5 100644
--- a/tests/base.at
+++ b/tests/base.at
@@ -2,7 +2,7 @@
AT_BANNER([Autoconf base layer.])
-# Copyright (C) 2000-2001, 2003, 2005-2017, 2020-2025 Free Software
+# Copyright (C) 2000-2001, 2003, 2005-2017, 2020-2026 Free Software
# Foundation, Inc.
#
# This program is free software: you can redistribute it and/or modify
diff --git a/tests/c.at b/tests/c.at
index a527430..0683bbe 100644
--- a/tests/c.at
+++ b/tests/c.at
@@ -2,7 +2,7 @@
AT_BANNER([C low level compiling/preprocessing macros.])
-# Copyright (C) 2000-2006, 2008-2017, 2020-2025 Free Software
+# Copyright (C) 2000-2006, 2008-2017, 2020-2026 Free Software
# Foundation, Inc.
#
# This program is free software: you can redistribute it and/or modify
diff --git a/tests/compile.at b/tests/compile.at
index 49b8865..aaa8a57 100644
--- a/tests/compile.at
+++ b/tests/compile.at
@@ -2,7 +2,7 @@
AT_BANNER([Low level compiling/preprocessing macros.])
-# Copyright (C) 2000-2001, 2003, 2005-2017, 2020-2025 Free Software
+# Copyright (C) 2000-2001, 2003, 2005-2017, 2020-2026 Free Software
# Foundation, Inc.
#
# This program is free software: you can redistribute it and/or modify
diff --git a/tests/erlang.at b/tests/erlang.at
index 37f1ff3..4f64291 100644
--- a/tests/erlang.at
+++ b/tests/erlang.at
@@ -8,7 +8,7 @@
AT_BANNER([Erlang low level compiling and utility macros.])
-# Copyright (C) 2009-2017, 2020-2025 Free Software Foundation, Inc.
+# Copyright (C) 2009-2017, 2020-2026 Free Software Foundation, Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
diff --git a/tests/foreign.at b/tests/foreign.at
index 2cb0594..3da7ae0 100644
--- a/tests/foreign.at
+++ b/tests/foreign.at
@@ -2,7 +2,7 @@
AT_BANNER([Compatibility with external tools and macros.])
-# Copyright (C) 2000-2007, 2009-2017, 2020-2025 Free Software
+# Copyright (C) 2000-2007, 2009-2017, 2020-2026 Free Software
# Foundation, Inc.
#
# This program is free software: you can redistribute it and/or modify
diff --git a/tests/fortran.at b/tests/fortran.at
index 1a33aa7..795eebd 100644
--- a/tests/fortran.at
+++ b/tests/fortran.at
@@ -2,7 +2,7 @@
AT_BANNER([Fortran low level compiling/preprocessing macros.])
-# Copyright (C) 2000-2001, 2003, 2008-2017, 2020-2025 Free Software
+# Copyright (C) 2000-2001, 2003, 2008-2017, 2020-2026 Free Software
# Foundation, Inc.
#
# This program is free software: you can redistribute it and/or modify
diff --git a/tests/go.at b/tests/go.at
index 6cc10c3..0c0c813 100644
--- a/tests/go.at
+++ b/tests/go.at
@@ -2,7 +2,7 @@
AT_BANNER([Go low level compiling and utility macros.])
-# Copyright (C) 2011-2017, 2020-2025 Free Software Foundation, Inc.
+# Copyright (C) 2011-2017, 2020-2026 Free Software Foundation, Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
diff --git a/tests/local.at b/tests/local.at
index 05cfdb3..6ee91ec 100644
--- a/tests/local.at
+++ b/tests/local.at
@@ -1,6 +1,6 @@
# M4 macros used in building Autoconf test suites. -*- Autotest -*-
-# Copyright (C) 2000-2017, 2020-2025 Free Software Foundation, Inc.
+# Copyright (C) 2000-2017, 2020-2026 Free Software Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
diff --git a/tests/local.mk b/tests/local.mk
index 77808f7..df673aa 100644
--- a/tests/local.mk
+++ b/tests/local.mk
@@ -1,6 +1,6 @@
## Make Autoconf tests.
-# Copyright (C) 2000-2017, 2020-2025 Free Software Foundation, Inc.
+# Copyright (C) 2000-2017, 2020-2026 Free Software Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
diff --git a/tests/m4sh.at b/tests/m4sh.at
index 3696187..47b6fc2 100644
--- a/tests/m4sh.at
+++ b/tests/m4sh.at
@@ -2,7 +2,7 @@
AT_BANNER([M4sh.])
-# Copyright (C) 2000-2017, 2020-2025 Free Software Foundation, Inc.
+# Copyright (C) 2000-2017, 2020-2026 Free Software Foundation, Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
diff --git a/tests/m4sugar.at b/tests/m4sugar.at
index aeddccc..5c678d4 100644
--- a/tests/m4sugar.at
+++ b/tests/m4sugar.at
@@ -2,7 +2,7 @@
AT_BANNER([M4sugar.])
-# Copyright (C) 2000-2002, 2005-2017, 2020-2025 Free Software
+# Copyright (C) 2000-2002, 2005-2017, 2020-2026 Free Software
# Foundation, Inc.
#
# This program is free software: you can redistribute it and/or modify
diff --git a/tests/mktests.pl b/tests/mktests.pl
index 1e19c09..9d358e9 100644
--- a/tests/mktests.pl
+++ b/tests/mktests.pl
@@ -2,7 +2,7 @@
# Build some of the Autoconf test files.
-# Copyright (C) 2000-2017, 2020-2025 Free Software Foundation, Inc.
+# Copyright (C) 2000-2017, 2020-2026 Free Software Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
diff --git a/tests/semantics.at b/tests/semantics.at
index 59464a2..1d061cb 100644
--- a/tests/semantics.at
+++ b/tests/semantics.at
@@ -2,7 +2,7 @@
AT_BANNER([Semantics.])
-# Copyright (C) 2000-2002, 2004-2007, 2009-2017, 2020-2025 Free Software
+# Copyright (C) 2000-2002, 2004-2007, 2009-2017, 2020-2026 Free Software
# Foundation, Inc.
#
# This program is free software: you can redistribute it and/or modify
diff --git a/tests/statesave.m4 b/tests/statesave.m4
index 9aad1b2..e6c7e82 100644
--- a/tests/statesave.m4
+++ b/tests/statesave.m4
@@ -1,6 +1,6 @@
# statesave.m4 serial 2
-# Copyright (C) 2000-2017, 2020-2025 Free Software Foundation, Inc.
+# Copyright (C) 2000-2017, 2020-2026 Free Software Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
diff --git a/tests/suite.at b/tests/suite.at
index 1600bf3..55a180d 100644
--- a/tests/suite.at
+++ b/tests/suite.at
@@ -1,6 +1,6 @@
# Validation suite for Autoconf -*- Autotest -*-
-# Copyright (C) 2000-2001, 2003-2005, 2009-2017, 2020-2025 Free Software
+# Copyright (C) 2000-2001, 2003-2005, 2009-2017, 2020-2026 Free Software
# Foundation, Inc.
#
# This program is free software: you can redistribute it and/or modify
diff --git a/tests/tools.at b/tests/tools.at
index 03f9c1a..8c08abb 100644
--- a/tests/tools.at
+++ b/tests/tools.at
@@ -2,7 +2,7 @@
AT_BANNER([Executables (autoheader, autoupdate...).])
-# Copyright (C) 2000-2001, 2003-2004, 2006-2017, 2020-2025 Free Software
+# Copyright (C) 2000-2001, 2003-2004, 2006-2017, 2020-2026 Free Software
# Foundation, Inc.
#
# This program is free software: you can redistribute it and/or modify
diff --git a/tests/torture.at b/tests/torture.at
index 0e14315..3b1d9f0 100644
--- a/tests/torture.at
+++ b/tests/torture.at
@@ -1,6 +1,6 @@
# -*- Autotest -*-
-# Copyright (C) 2000-2017, 2020-2025 Free Software Foundation, Inc.
+# Copyright (C) 2000-2017, 2020-2026 Free Software Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
diff --git a/tests/wrapper.as b/tests/wrapper.as
index b4c7ea4..060e3ef 100644
--- a/tests/wrapper.as
+++ b/tests/wrapper.as
@@ -1,7 +1,7 @@
AS_INIT[]dnl -*- shell-script -*-
# wrapper.as -- running '@wrap_program@' as if it were installed.
# @configure_input@
-# Copyright (C) 2003-2004, 2007, 2009-2017, 2020-2025 Free Software
+# Copyright (C) 2003-2004, 2007, 2009-2017, 2020-2026 Free Software
# Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
