autoconf: make update-copyright

https://github.com/libsdl-org/autoconf/commit/300349c84bce66b84b8d9cc8bb6b37d46aa19585

From 300349c84bce66b84b8d9cc8bb6b37d46aa19585 Mon Sep 17 00:00:00 2001
From: Zack Weinberg <[EMAIL REDACTED]>
Date: Thu, 28 Jan 2021 15:19:21 -0500
Subject: [PATCH] make update-copyright

---
 .x-update-copyright        | 30 +++++++++++++++++++++++-------
 AUTHORS                    |  2 +-
 BUGS                       |  2 +-
 HACKING                    |  2 +-
 Makefile.am                |  4 ++--
 NEWS                       |  3 ++-
 README                     |  4 ++--
 README-alpha               |  3 ++-
 README-hacking             |  2 +-
 THANKS                     |  2 +-
 TODO                       |  2 +-
 bin/autoconf.as            |  2 +-
 bin/autoheader.in          |  2 +-
 bin/autom4te.in            |  4 ++--
 bin/autoreconf.in          |  3 ++-
 bin/autoscan.in            |  3 ++-
 bin/autoupdate.in          |  3 ++-
 bin/ifnames.in             |  2 +-
 bin/local.mk               |  4 ++--
 build-aux/fetch.pl         |  2 +-
 build-aux/help-extract.pl  |  2 +-
 cfg.mk                     |  2 +-
 configure.ac               |  6 +++---
 doc/autoconf.texi          |  4 ++--
 doc/install.texi           |  4 ++--
 doc/local.mk               |  4 ++--
 lib/Autom4te/C4che.pm      |  4 ++--
 lib/Autom4te/Config.pm     |  2 +-
 lib/Autom4te/General.pm    |  2 +-
 lib/Autom4te/Request.pm    |  4 ++--
 lib/autoconf/autoconf.m4   |  4 ++--
 lib/autoconf/autoheader.m4 |  2 +-
 lib/autoconf/autoscan.m4   |  3 ++-
 lib/autoconf/autotest.m4   |  2 +-
 lib/autoconf/autoupdate.m4 |  4 ++--
 lib/autoconf/c.m4          |  2 +-
 lib/autoconf/erlang.m4     |  3 ++-
 lib/autoconf/fortran.m4    |  3 ++-
 lib/autoconf/functions.m4  |  2 +-
 lib/autoconf/general.m4    |  3 ++-
 lib/autoconf/go.m4         |  2 +-
 lib/autoconf/headers.m4    |  4 ++--
 lib/autoconf/lang.m4       |  4 ++--
 lib/autoconf/libs.m4       |  2 +-
 lib/autoconf/oldnames.m4   |  4 ++--
 lib/autoconf/programs.m4   |  4 ++--
 lib/autoconf/specific.m4   |  4 ++--
 lib/autoconf/status.m4     |  4 ++--
 lib/autoconf/types.m4      |  4 ++--
 lib/autom4te.in            |  2 +-
 lib/autoscan/autoscan.pre  |  2 +-
 lib/autotest/autotest.m4   |  4 ++--
 lib/autotest/general.m4    |  2 +-
 lib/autotest/specific.m4   |  2 +-
 lib/emacs/autoconf-mode.el |  4 ++--
 lib/emacs/autotest-mode.el |  3 ++-
 lib/freeze.mk              |  4 ++--
 lib/local.mk               |  4 ++--
 lib/m4sugar/foreach.m4     |  2 +-
 lib/m4sugar/m4sh.m4        |  2 +-
 lib/m4sugar/m4sugar.m4     |  2 +-
 m4/m4.m4                   |  3 ++-
 m4/make-case.m4            |  2 +-
 man/local.mk               |  3 ++-
 tests/atlocal.in           |  2 +-
 tests/autoscan.at          |  3 ++-
 tests/autotest.at          |  2 +-
 tests/base.at              |  2 +-
 tests/c.at                 |  4 ++--
 tests/compile.at           |  2 +-
 tests/erlang.at            |  2 +-
 tests/foreign.at           |  4 ++--
 tests/fortran.at           |  2 +-
 tests/go.at                |  2 +-
 tests/local.at             |  2 +-
 tests/local.mk             |  2 +-
 tests/m4sh.at              |  2 +-
 tests/m4sugar.at           |  4 ++--
 tests/mktests.pl           |  2 +-
 tests/semantics.at         |  2 +-
 tests/statesave.m4         |  2 +-
 tests/suite.at             |  2 +-
 tests/tools.at             |  2 +-
 tests/torture.at           |  2 +-
 tests/wrapper.as           |  2 +-
 85 files changed, 147 insertions(+), 118 deletions(-)

diff --git a/.x-update-copyright b/.x-update-copyright
index d396f4bf..616328c6 100644
--- a/.x-update-copyright
+++ b/.x-update-copyright
@@ -1,17 +1,33 @@
 # Prior year changelogs don't need update.
 ChangeLog..*
+# Test data should not be changed.
+tests/data/.*
 # Upstream files that should not have copyright updated here.
 COPYING.*
 GNUmakefile
-build-aux/.*
-lib/Autom4te/Configure_ac.pm
-lib/Autom4te/Channels.pm
-lib/Autom4te/FileUtils.pm
-lib/Autom4te/Struct.pm
-lib/Autom4te/XFile.pm
-doc/fdl.*
+maint.mk
+build-aux/announce-gen
+build-aux/config.guess
+build-aux/config.sub
+build-aux/gendocs.sh
+build-aux/git-version-gen
+build-aux/gitlog-to-changelog
+build-aux/gnupload
+build-aux/install-sh
+build-aux/move-if-change
+build-aux/update-copyright
+build-aux/useless-if-before-free
+build-aux/texinfo.tex
+build-aux/vc-list-files
+doc/fdl.texi
 doc/gendocs_template
 doc/gnu-oids.texi
 doc/make-stds.texi
 doc/standards.texi
+lib/Autom4te/ChannelDefs.pm
+lib/Autom4te/Channels.pm
+lib/Autom4te/Configure_ac.pm
+lib/Autom4te/FileUtils.pm
+lib/Autom4te/Getopt.pm
+lib/Autom4te/XFile.pm
 m4/autobuild.m4
diff --git a/AUTHORS b/AUTHORS
index b1f5bce1..b6a63f21 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -111,7 +111,7 @@ mode: text
 coding: utf-8
 End:
 
-Copyright (C) 1996, 2000-2001, 2005, 2007-2017, 2020 Free Software
+Copyright (C) 1996, 2000-2001, 2005, 2007-2017, 2020-2021 Free Software
 Foundation, Inc.
 
 This program is free software: you can redistribute it and/or modify
diff --git a/BUGS b/BUGS
index 6229c20b..7a19bf58 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 Free Software
+	Copyright (C) 2000-2002, 2006-2017, 2020-2021 Free Software
 	Foundation, Inc.
 
 	Copying and distribution of this file, with or without
diff --git a/HACKING b/HACKING
index 1bd30ac5..f7c54d03 100644
--- a/HACKING
+++ b/HACKING
@@ -155,7 +155,7 @@ that needs to be updated.
 
 -----
 
-Copyright (C) 2002, 2008-2017, 2020 Free Software Foundation, Inc.
+Copyright (C) 2002, 2008-2017, 2020-2021 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 ecc9cb35..17e1f8f4 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,7 +1,7 @@
 # Make Autoconf.
 
-# Copyright (C) 1999-2004, 2006-2017, 2020 Free Software Foundation,
-# Inc.
+# Copyright (C) 1999-2004, 2006-2017, 2020-2021 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/NEWS b/NEWS
index 9006933b..e6f5d8c3 100644
--- a/NEWS
+++ b/NEWS
@@ -2584,7 +2584,8 @@ Various bug fixes.
 
 -----
 
-Copyright (C) 1993-1996, 1998-2017, 2020 Free Software Foundation, Inc.
+Copyright (C) 1993-1996, 1998-2017, 2020-2021 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/README b/README
index c7255894..fd16df7c 100644
--- a/README
+++ b/README
@@ -57,8 +57,8 @@ note that the range specifies every single year in that closed interval.
 
 -----
 
-Copyright (C) 1992-1994, 1998, 2000-2017, 2020 Free Software Foundation,
-Inc.
+Copyright (C) 1992-1994, 1998, 2000-2017, 2020-2021 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/README-alpha b/README-alpha
index 2e068c61..574f6e03 100644
--- a/README-alpha
+++ b/README-alpha
@@ -22,7 +22,8 @@ users.
 
 -----
 
-Copyright (C) 2000-2003, 2009-2017, 2020 Free Software Foundation, Inc.
+Copyright (C) 2000-2003, 2009-2017, 2020-2021 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/README-hacking b/README-hacking
index fb48d4d6..1743dd37 100644
--- a/README-hacking
+++ b/README-hacking
@@ -133,7 +133,7 @@ Enjoy!
 
 -----
 
-Copyright (C) 2002-2017, 2020 Free Software Foundation, Inc.
+Copyright (C) 2002-2017, 2020-2021 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 3e10d7a0..a3290316 100644
--- a/THANKS
+++ b/THANKS
@@ -453,7 +453,7 @@ mode: text
 coding: utf-8
 End:
 
-Copyright (C) 1999-2017, 2020 Free Software Foundation, Inc.
+Copyright (C) 1999-2017, 2020-2021 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 62619219..2359f8ea 100644
--- a/TODO
+++ b/TODO
@@ -591,7 +591,7 @@ with autoconf scripts.
 
 ------------------------------------------------------------------------------
 
-Copyright (C) 1994-1996, 1999-2002, 2007-2017, 2020 Free Software
+Copyright (C) 1994-1996, 1999-2002, 2007-2017, 2020-2021 Free Software
 Foundation, Inc.
 
 Copying and distribution of this file, with or without modification,
diff --git a/bin/autoconf.as b/bin/autoconf.as
index 93563c97..1407739d 100644
--- a/bin/autoconf.as
+++ b/bin/autoconf.as
@@ -3,7 +3,7 @@ m4_divert_push([HEADER-COPYRIGHT])dnl
 # @configure_input@
 # autoconf -- create 'configure' using m4 macros.
 
-# Copyright (C) 1992-1994, 1996, 1999-2017, 2020 Free Software
+# Copyright (C) 1992-1994, 1996, 1999-2017, 2020-2021 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 1f3af9f1..1cbf5091 100644
--- a/bin/autoheader.in
+++ b/bin/autoheader.in
@@ -7,7 +7,7 @@ eval 'case $# in 0) exec @PERL@ -S "$0";; *) exec @PERL@ -S "$0" "$@";; esac'
 
 # autoheader -- create 'config.h.in' from 'configure.ac'.
 
-# Copyright (C) 1992-1994, 1996, 1998-2017, 2020 Free Software
+# Copyright (C) 1992-1994, 1996, 1998-2017, 2020-2021 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 64653a44..7ebe419c 100644
--- a/bin/autom4te.in
+++ b/bin/autom4te.in
@@ -6,8 +6,8 @@ eval 'case $# in 0) exec @PERL@ -S "$0";; *) exec @PERL@ -S "$0" "$@";; esac'
     if 0;
 
 # autom4te - Wrapper around M4 libraries.
-# Copyright (C) 2001-2003, 2005-2017, 2020 Free Software Foundation,
-# Inc.
+# Copyright (C) 2001-2003, 2005-2017, 2020-2021 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/bin/autoreconf.in b/bin/autoreconf.in
index 9855efbe..ec391a6d 100644
--- a/bin/autoreconf.in
+++ b/bin/autoreconf.in
@@ -6,7 +6,8 @@ eval 'case $# in 0) exec @PERL@ -S "$0";; *) exec @PERL@ -S "$0" "$@";; esac'
     if 0;
 
 # autoreconf - install the GNU Build System in a directory tree
-# Copyright (C) 1994, 1999-2017, 2020 Free Software Foundation, Inc.
+# Copyright (C) 1994, 1999-2017, 2020-2021 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/bin/autoscan.in b/bin/autoscan.in
index 658a7980..b89fd1a6 100644
--- a/bin/autoscan.in
+++ b/bin/autoscan.in
@@ -3,7 +3,8 @@
 # @configure_input@
 
 # autoscan - Create configure.scan (a preliminary configure.ac) for a package.
-# Copyright (C) 1994, 1999-2017, 2020 Free Software Foundation, Inc.
+# Copyright (C) 1994, 1999-2017, 2020-2021 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/bin/autoupdate.in b/bin/autoupdate.in
index 047f8e0e..c86203a4 100644
--- a/bin/autoupdate.in
+++ b/bin/autoupdate.in
@@ -3,7 +3,8 @@
 # @configure_input@
 
 # autoupdate - modernize an Autoconf file.
-# Copyright (C) 1994, 1999-2017, 2020 Free Software Foundation, Inc.
+# Copyright (C) 1994, 1999-2017, 2020-2021 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/bin/ifnames.in b/bin/ifnames.in
index 075ff3eb..b04947f2 100644
--- a/bin/ifnames.in
+++ b/bin/ifnames.in
@@ -7,7 +7,7 @@ eval 'case $# in 0) exec @PERL@ -S "$0";; *) exec @PERL@ -S "$0" "$@";; esac'
 
 # ifnames - print the identifiers used in C preprocessor conditionals
 
-# Copyright (C) 1994-1995, 1999-2003, 2005-2017, 2020 Free Software
+# Copyright (C) 1994-1995, 1999-2003, 2005-2017, 2020-2021 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 93eb7376..e923707f 100644
--- a/bin/local.mk
+++ b/bin/local.mk
@@ -1,7 +1,7 @@
 # Make Autoconf commands.
 
-# Copyright (C) 1999-2007, 2009-2017, 2020 Free Software Foundation,
-# Inc.
+# Copyright (C) 1999-2007, 2009-2017, 2020-2021 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 d97a9f20..e41b5f1d 100755
--- a/build-aux/fetch.pl
+++ b/build-aux/fetch.pl
@@ -1,5 +1,5 @@
 #! /usr/bin/perl
-# Copyright (C) 2020 Free Software Foundation, Inc.
+# Copyright (C) 2020-2021 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 0edc793a..bb104253 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 Free Software Foundation, Inc.
+# Copyright (C) 2020-2021 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 a15974bf..ce6edfdb 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 Free Software
+# Copyright (C) 2003-2004, 2006, 2008-2017, 2020-2021 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 56d27549..e6750473 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,8 +1,8 @@
 #                                                       -*- Autoconf -*-
 # Process this file with autoconf to produce a configure script.
 
-# Copyright (C) 1992-1995, 1999-2017, 2020 Free Software Foundation,
-# Inc.
+# Copyright (C) 1992-1995, 1999-2017, 2020-2021 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
@@ -30,7 +30,7 @@ AM_INIT_AUTOMAKE([1.11 dist-xz readme-alpha no-texinfo.tex std-options])
 
 # 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=2020
+RELEASE_YEAR=2021
 AC_SUBST([RELEASE_YEAR])
 
 AB_INIT
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index b65d698e..7b42dd6a 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -210,8 +210,8 @@ This manual (@value{UPDATED}) is for GNU Autoconf
 a package for creating scripts to configure source code packages using
 templates and an M4 macro package.
 
-Copyright @copyright{} 1992--1996, 1998--2017, 2020
-Free Software Foundation, Inc.
+Copyright @copyright{} 1992--1996, 1998--2017, 2020--2021 Free Software
+Foundation, Inc.
 
 @quotation
 Permission is granted to copy, distribute and/or modify this document
diff --git a/doc/install.texi b/doc/install.texi
index 875b8ebd..3bedb4ef 100644
--- a/doc/install.texi
+++ b/doc/install.texi
@@ -5,8 +5,8 @@
 
 @unnumbered Installation Instructions
 
-Copyright @copyright{} 1994-1996, 1999-2002, 2004-2017, 2020 Free
-Software Foundation, Inc.
+Copyright @copyright{} 1994--1996, 1999--2002, 2004--2017, 2020--2021
+Free Software Foundation, Inc.
 
 Copying and distribution of this file, with or without modification, are
 permitted in any medium without royalty provided the copyright notice
diff --git a/doc/local.mk b/doc/local.mk
index 8a0b1538..e3e69f23 100644
--- a/doc/local.mk
+++ b/doc/local.mk
@@ -1,7 +1,7 @@
 # Make Autoconf documentation.
 
-# Copyright (C) 2000-2003, 2007-2017, 2020 Free Software Foundation,
-# Inc.
+# Copyright (C) 2000-2003, 2007-2017, 2020-2021 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/C4che.pm b/lib/Autom4te/C4che.pm
index 5e3bea37..f5164811 100644
--- a/lib/Autom4te/C4che.pm
+++ b/lib/Autom4te/C4che.pm
@@ -1,6 +1,6 @@
 # autoconf -- create `configure' using m4 macros
-# Copyright (C) 2003, 2006, 2009-2017, 2020 Free Software Foundation,
-# Inc.
+# Copyright (C) 2003, 2006, 2009-2017, 2020-2021 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/Config.pm b/lib/Autom4te/Config.pm
index 23c5ac14..afb4f8f2 100644
--- a/lib/Autom4te/Config.pm
+++ b/lib/Autom4te/Config.pm
@@ -1,5 +1,5 @@
 #  -*- Perl -*-
-# Copyright (C) 2003-2020 Free Software Foundation, Inc.
+# Copyright (C) 2003-2021 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 e07e7e0f..fac67ab1 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 Free Software
+# Copyright (C) 2001-2004, 2006-2007, 2009-2017, 2020-2021 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 b3be33c7..67a60074 100644
--- a/lib/Autom4te/Request.pm
+++ b/lib/Autom4te/Request.pm
@@ -1,6 +1,6 @@
 # autoconf -- create `configure' using m4 macros
-# Copyright (C) 2001-2003, 2009-2017, 2020 Free Software Foundation,
-# Inc.
+# Copyright (C) 2001-2003, 2009-2017, 2020-2021 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/autoconf/autoconf.m4 b/lib/autoconf/autoconf.m4
index 934ef184..c1c2c789 100644
--- a/lib/autoconf/autoconf.m4
+++ b/lib/autoconf/autoconf.m4
@@ -1,8 +1,8 @@
 # This file is part of Autoconf.                -*- Autoconf -*-
 # Driver that loads the Autoconf macro files.
 #
-# Copyright (C) 1994, 1999-2002, 2006, 2008-2017, 2020 Free Software
-# Foundation, Inc.
+# Copyright (C) 1994, 1999-2002, 2006, 2008-2017, 2020-2021 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/autoheader.m4 b/lib/autoconf/autoheader.m4
index f5764e5e..0611e4bf 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 Free Software
+# Copyright (C) 1992-1996, 1998-2002, 2008-2017, 2020-2021 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 332e9ebe..450a6d58 100644
--- a/lib/autoconf/autoscan.m4
+++ b/lib/autoconf/autoscan.m4
@@ -1,7 +1,8 @@
 # This file is part of Autoconf.                       -*- Autoconf -*-
 # Interface with autoscan.
 
-# Copyright (C) 2002, 2009-2017, 2020 Free Software Foundation, Inc.
+# Copyright (C) 2002, 2009-2017, 2020-2021 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/autotest.m4 b/lib/autoconf/autotest.m4
index 141bbbe0..0ffb9ec7 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 Free Software
+# Copyright (C) 1992-1996, 1998-2005, 2009-2017, 2020-2021 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 a3e13a69..2b495d30 100644
--- a/lib/autoconf/autoupdate.m4
+++ b/lib/autoconf/autoupdate.m4
@@ -1,8 +1,8 @@
 # This file is part of Autoconf.                       -*- Autoconf -*-
 # Interface with autoupdate.
 
-# Copyright (C) 1992-1996, 1998-2001, 2003-2004, 2006, 2009-2017, 2020
-# Free Software Foundation, Inc.
+# Copyright (C) 1992-1996, 1998-2001, 2003-2004, 2006, 2009-2017,
+# 2020-2021 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 7ad6b4f7..9f881f0b 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 Free Software Foundation, Inc.
+# Copyright (C) 2001-2017, 2020-2021 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 b1d3ab1f..50bc9313 100644
--- a/lib/autoconf/erlang.m4
+++ b/lib/autoconf/erlang.m4
@@ -1,6 +1,7 @@
 # This file is part of Autoconf.                       -*- Autoconf -*-
 # Erlang/OTP language support.
-# Copyright (C) 2006, 2008-2017, 2020 Free Software Foundation, Inc.
+# Copyright (C) 2006, 2008-2017, 2020-2021 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/fortran.m4 b/lib/autoconf/fortran.m4
index 16bd9cb0..641c5fb6 100644
--- a/lib/autoconf/fortran.m4
+++ b/lib/autoconf/fortran.m4
@@ -1,6 +1,7 @@
 # This file is part of Autoconf.                       -*- Autoconf -*-
 # Fortran languages support.
-# Copyright (C) 2001, 2003-2017, 2020 Free Software Foundation, Inc.
+# Copyright (C) 2001, 2003-2017, 2020-2021 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/functions.m4 b/lib/autoconf/functions.m4
index 12f60b99..c5add9f8 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 Free Software Foundation, Inc.
+# Copyright (C) 2000-2017, 2020-2021 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 47f7ee42..053130b3 100644
--- a/lib/autoconf/general.m4
+++ b/lib/autoconf/general.m4
@@ -1,7 +1,8 @@
 # This file is part of Autoconf.                       -*- Autoconf -*-
 # Parameterized macros.
 m4_define([_AC_COPYRIGHT_YEARS], [
-Copyright (C) 1992-1996, 1998-2017, 2020 Free Software Foundation, Inc.
+Copyright (C) 1992-1996, 1998-2017, 2020-2021 Free Software Foundation,
+Inc.
 ])
 
 # This file is part of Autoconf.  This program is free
diff --git a/lib/autoconf/go.m4 b/lib/autoconf/go.m4
index e86700a6..ac91cddf 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 Free Software Foundation, Inc.
+# Copyright (C) 2011-2017, 2020-2021 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 802eec2f..548f0562 100644
--- a/lib/autoconf/headers.m4
+++ b/lib/autoconf/headers.m4
@@ -1,8 +1,8 @@
 # This file is part of Autoconf.			-*- Autoconf -*-
 # Checking for headers.
 #
-# Copyright (C) 1988, 1999-2004, 2006, 2008-2017, 2020 Free Software
-# Foundation, Inc.
+# Copyright (C) 1988, 1999-2004, 2006, 2008-2017, 2020-2021 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/lang.m4 b/lib/autoconf/lang.m4
index b1e730a2..daa88418 100644
--- a/lib/autoconf/lang.m4
+++ b/lib/autoconf/lang.m4
@@ -1,7 +1,7 @@
 # This file is part of Autoconf.                       -*- Autoconf -*-
 # Programming languages support.
-# Copyright (C) 2000-2002, 2004-2017, 2020 Free Software Foundation,
-# Inc.
+# Copyright (C) 2000-2002, 2004-2017, 2020-2021 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/libs.m4 b/lib/autoconf/libs.m4
index f2343bcc..901c9733 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 Free Software
+# Copyright (C) 1992-1996, 1998-2006, 2008-2017, 2020-2021 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 843d60d9..671b523f 100644
--- a/lib/autoconf/oldnames.m4
+++ b/lib/autoconf/oldnames.m4
@@ -1,7 +1,7 @@
 # This file is part of Autoconf.                           -*- Autoconf -*-
 # Support old macros, and provide automated updates.
-# Copyright (C) 1994, 1999-2001, 2003, 2009-2017, 2020 Free Software
-# Foundation, Inc.
+# Copyright (C) 1994, 1999-2001, 2003, 2009-2017, 2020-2021 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/programs.m4 b/lib/autoconf/programs.m4
index 63e07043..588a7bdc 100644
--- a/lib/autoconf/programs.m4
+++ b/lib/autoconf/programs.m4
@@ -1,8 +1,8 @@
 # This file is part of Autoconf.                       -*- Autoconf -*-
 # Checking for programs.
 
-# Copyright (C) 1992-1996, 1998-2017, 2020 Free Software Foundation,
-# Inc.
+# Copyright (C) 1992-1996, 1998-2017, 2020-2021 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/specific.m4 b/lib/autoconf/specific.m4
index 853276bb..2752e05d 100644
--- a/lib/autoconf/specific.m4
+++ b/lib/autoconf/specific.m4
@@ -1,8 +1,8 @@
 # This file is part of Autoconf.			-*- Autoconf -*-
 # Macros that test for specific, unclassified, features.
 #
-# Copyright (C) 1992-1996, 1998-2017, 2020 Free Software Foundation,
-# Inc.
+# Copyright (C) 1992-1996, 1998-2017, 2020-2021 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/status.m4 b/lib/autoconf/status.m4
index d11a221c..ca8cb692 100644
--- a/lib/autoconf/status.m4
+++ b/lib/autoconf/status.m4
@@ -1,7 +1,7 @@
 # This file is part of Autoconf.                       -*- Autoconf -*-
 # Parameterizing and creating config.status.
-# Copyright (C) 1992-1996, 1998-2017, 2020 Free Software Foundation,
-# Inc.
+# Copyright (C) 1992-1996, 1998-2017, 2020-2021 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/types.m4 b/lib/autoconf/types.m4
index fff850ac..6d170918 100644
--- a/lib/autoconf/types.m4
+++ b/lib/autoconf/types.m4
@@ -1,8 +1,8 @@
 # This file is part of Autoconf.			-*- Autoconf -*-
 # Type related macros: existence, sizeof, and structure members.
 #
-# Copyright (C) 2000-2002, 2004-2017, 2020 Free Software Foundation,
-# Inc.
+# Copyright (C) 2000-2002, 2004-2017, 2020-2021 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/autom4te.in b/lib/autom4te.in
index 566c5dca..9e86c9ff 100644
--- a/lib/autom4te.in
+++ b/lib/autom4te.in
@@ -1,6 +1,6 @@
 # Definition of Autom4te option sets.                     -*- Makefile -*-
 #
-# Copyright (C) 2001-2017, 2020 Free Software Foundation, Inc.
+# Copyright (C) 2001-2017, 2020-2021 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 effd915c..85797e65 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 Free
+# Copyright (C) 1992-1994, 1996, 1999-2002, 2009-2017, 2020-2021 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 0f02b52f..76d410be 100644
--- a/lib/autotest/autotest.m4
+++ b/lib/autotest/autotest.m4
@@ -1,7 +1,7 @@
 # This file is part of Autoconf.			-*- Autoconf -*-
 # M4 macros used in building test suites.
-# Copyright (C) 2000-2002, 2009-2017, 2020 Free Software Foundation,
-# Inc.
+# Copyright (C) 2000-2002, 2009-2017, 2020-2021 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/autotest/general.m4 b/lib/autotest/general.m4
index 0c0e3c5b..40c92d93 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 Free Software Foundation, Inc.
+Copyright (C) 2000-2017, 2020-2021 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 9d628598..3558205a 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 Free Software Foundation, Inc.])
+[Copyright (C) 2009-2017, 2020-2021 Free Software Foundation, Inc.])
 
 # This file is part of Autoconf.  This program is free
 # software; you can redist

(Patch may be truncated, please check the link at the top of this post.)