Merge from origin/emacs-27

186152ba40 Pacify gcc -Wunused-function on Ubuntu 18.04.3
4cd143aded Fix copyright years by hand
365e01cc9f Update copyright year to 2020
cd2c156163 ; * etc/NEWS: Make the description of XDG fallback more ac...

# Conflicts:
#	etc/NEWS
#	etc/refcards/ru-refcard.tex

123 files changed, 149 insertions, 133 deletions

diff --git a/m4/00gnulib.m4 b/m4/00gnulib.m4
index e3e0fb6daa2..1a1a1d74f7e 100644
--- a/m4/00gnulib.m4
+++ b/m4/00gnulib.m4
@@ -1,5 +1,5 @@
 # 00gnulib.m4 serial 3
-dnl Copyright (C) 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/__inline.m4 b/m4/__inline.m4
index e1aa310c957..520c8c4b208 100644
--- a/m4/__inline.m4
+++ b/m4/__inline.m4
@@ -1,5 +1,5 @@
 # Test for __inline keyword
-dnl Copyright 2017-2019 Free Software Foundation, Inc.
+dnl Copyright 2017-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/absolute-header.m4 b/m4/absolute-header.m4
index a8f2cba173f..39726ba57ba 100644
--- a/m4/absolute-header.m4
+++ b/m4/absolute-header.m4
@@ -1,5 +1,5 @@
 # absolute-header.m4 serial 16
-dnl Copyright (C) 2006-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2006-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/acl.m4 b/m4/acl.m4
index 5234a80f93f..e459451ae31 100644
--- a/m4/acl.m4
+++ b/m4/acl.m4
@@ -1,7 +1,7 @@
 # acl.m4 - check for access control list (ACL) primitives
 # serial 23
 
-# Copyright (C) 2002, 2004-2019 Free Software Foundation, Inc.
+# Copyright (C) 2002, 2004-2020 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
diff --git a/m4/alloca.m4 b/m4/alloca.m4
index 29bd289b02a..5f4653967d1 100644
--- a/m4/alloca.m4
+++ b/m4/alloca.m4
@@ -1,6 +1,6 @@
 # alloca.m4 serial 15
-dnl Copyright (C) 2002-2004, 2006-2007, 2009-2019 Free Software Foundation,
-dnl Inc.
+dnl Copyright (C) 2002-2004, 2006-2007, 2009-2020 Free Software
+dnl Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/builtin-expect.m4 b/m4/builtin-expect.m4
index b65fbf87a62..a6e889503dc 100644
--- a/m4/builtin-expect.m4
+++ b/m4/builtin-expect.m4
@@ -1,6 +1,6 @@
 dnl Check for __builtin_expect.
 
-dnl Copyright 2016-2019 Free Software Foundation, Inc.
+dnl Copyright 2016-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/byteswap.m4 b/m4/byteswap.m4
index 05fc6cd58e4..0f43994eb7d 100644
--- a/m4/byteswap.m4
+++ b/m4/byteswap.m4
@@ -1,5 +1,5 @@
 # byteswap.m4 serial 4
-dnl Copyright (C) 2005, 2007, 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2005, 2007, 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/canonicalize.m4 b/m4/canonicalize.m4
index cb0896fbd8b..bdc5c8f71a7 100644
--- a/m4/canonicalize.m4
+++ b/m4/canonicalize.m4
@@ -1,6 +1,6 @@
 # canonicalize.m4 serial 31
 
-dnl Copyright (C) 2003-2007, 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2003-2007, 2009-2020 Free Software Foundation, Inc.
 
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
diff --git a/m4/clock_time.m4 b/m4/clock_time.m4
index 8f7a7fcd103..f4f51fa0eac 100644
--- a/m4/clock_time.m4
+++ b/m4/clock_time.m4
@@ -1,5 +1,5 @@
 # clock_time.m4 serial 10
-dnl Copyright (C) 2002-2006, 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2002-2006, 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/close-stream.m4 b/m4/close-stream.m4
index 5d31221b0cf..f3cc7aa9466 100644
--- a/m4/close-stream.m4
+++ b/m4/close-stream.m4
@@ -1,5 +1,5 @@
 #serial 4
-dnl Copyright (C) 2006-2007, 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2006-2007, 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/copy-file-range.m4 b/m4/copy-file-range.m4
index 20fd05697fe..5c5a274d9cc 100644
--- a/m4/copy-file-range.m4
+++ b/m4/copy-file-range.m4
@@ -1,5 +1,5 @@
 # copy-file-range.m4
-dnl Copyright 2019 Free Software Foundation, Inc.
+dnl Copyright 2019-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/count-leading-zeros.m4 b/m4/count-leading-zeros.m4
index efe31f9911d..76cc876f296 100644
--- a/m4/count-leading-zeros.m4
+++ b/m4/count-leading-zeros.m4
@@ -1,5 +1,5 @@
 # count-leading-zeros.m4 serial 2
-dnl Copyright (C) 2012-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2012-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/count-one-bits.m4 b/m4/count-one-bits.m4
index b4721b549cc..132d52761f0 100644
--- a/m4/count-one-bits.m4
+++ b/m4/count-one-bits.m4
@@ -1,5 +1,5 @@
 # count-one-bits.m4 serial 3
-dnl Copyright (C) 2007, 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2007, 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/count-trailing-zeros.m4 b/m4/count-trailing-zeros.m4
index 94a8f7f2e1f..0344c8ffa50 100644
--- a/m4/count-trailing-zeros.m4
+++ b/m4/count-trailing-zeros.m4
@@ -1,5 +1,5 @@
 # count-trailing-zeros.m4
-dnl Copyright (C) 2013-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2013-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/d-type.m4 b/m4/d-type.m4
index 4ca56d61910..bcb179ad4e1 100644
--- a/m4/d-type.m4
+++ b/m4/d-type.m4
@@ -5,7 +5,8 @@ dnl
 dnl Check whether struct dirent has a member named d_type.
 dnl
 
-# Copyright (C) 1997, 1999-2004, 2006, 2009-2019 Free Software Foundation, Inc.
+# Copyright (C) 1997, 1999-2004, 2006, 2009-2020 Free Software
+# Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
diff --git a/m4/dirent_h.m4 b/m4/dirent_h.m4
index 732aa554c20..8bef6a0ce61 100644
--- a/m4/dirent_h.m4
+++ b/m4/dirent_h.m4
@@ -1,5 +1,5 @@
 # dirent_h.m4 serial 16
-dnl Copyright (C) 2008-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2008-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/dirfd.m4 b/m4/dirfd.m4
index 5c7586997fd..d92445e6d80 100644
--- a/m4/dirfd.m4
+++ b/m4/dirfd.m4
@@ -2,7 +2,7 @@
 
 dnl Find out how to get the file descriptor associated with an open DIR*.
 
-# Copyright (C) 2001-2006, 2008-2019 Free Software Foundation, Inc.
+# Copyright (C) 2001-2006, 2008-2020 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
diff --git a/m4/double-slash-root.m4 b/m4/double-slash-root.m4
index 0c5afb17156..c463ac41aca 100644
--- a/m4/double-slash-root.m4
+++ b/m4/double-slash-root.m4
@@ -1,5 +1,5 @@
 # double-slash-root.m4 serial 4   -*- Autoconf -*-
-dnl Copyright (C) 2006, 2008-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2006, 2008-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/dup2.m4 b/m4/dup2.m4
index b314247d3bc..2835bb1cf99 100644
--- a/m4/dup2.m4
+++ b/m4/dup2.m4
@@ -1,5 +1,6 @@
 #serial 25
-dnl Copyright (C) 2002, 2005, 2007, 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2002, 2005, 2007, 2009-2020 Free Software Foundation,
+dnl Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/eealloc.m4 b/m4/eealloc.m4
index 2a4b120a172..236f373c564 100644
--- a/m4/eealloc.m4
+++ b/m4/eealloc.m4
@@ -1,5 +1,5 @@
 # eealloc.m4 serial 3
-dnl Copyright (C) 2003, 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2003, 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/environ.m4 b/m4/environ.m4
index c1a6fa37468..bab85f13404 100644
--- a/m4/environ.m4
+++ b/m4/environ.m4
@@ -1,5 +1,5 @@
 # environ.m4 serial 7
-dnl Copyright (C) 2001-2004, 2006-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2001-2004, 2006-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/errno_h.m4 b/m4/errno_h.m4
index 2388854e057..dd4994f3d5d 100644
--- a/m4/errno_h.m4
+++ b/m4/errno_h.m4
@@ -1,5 +1,5 @@
 # errno_h.m4 serial 13
-dnl Copyright (C) 2004, 2006, 2008-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2004, 2006, 2008-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/euidaccess.m4 b/m4/euidaccess.m4
index 8e840e63c2f..39f28b39b0b 100644
--- a/m4/euidaccess.m4
+++ b/m4/euidaccess.m4
@@ -1,5 +1,5 @@
 # euidaccess.m4 serial 15
-dnl Copyright (C) 2002-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2002-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/execinfo.m4 b/m4/execinfo.m4
index b291c0a4cb4..37ee8de5927 100644
--- a/m4/execinfo.m4
+++ b/m4/execinfo.m4
@@ -1,6 +1,6 @@
 # Check for GNU-style execinfo.h.
 
-dnl Copyright 2012-2019 Free Software Foundation, Inc.
+dnl Copyright 2012-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/explicit_bzero.m4 b/m4/explicit_bzero.m4
index 1357b59d5b7..507816affdb 100644
--- a/m4/explicit_bzero.m4
+++ b/m4/explicit_bzero.m4
@@ -1,4 +1,4 @@
-dnl Copyright 2017-2019 Free Software Foundation, Inc.
+dnl Copyright 2017-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/extensions.m4 b/m4/extensions.m4
index fd1ce817f06..d7c95effdac 100644
--- a/m4/extensions.m4
+++ b/m4/extensions.m4
@@ -1,7 +1,7 @@
 # serial 18  -*- Autoconf -*-
 # Enable extensions on systems that normally disable them.
 
-# Copyright (C) 2003, 2006-2019 Free Software Foundation, Inc.
+# Copyright (C) 2003, 2006-2020 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
diff --git a/m4/extern-inline.m4 b/m4/extern-inline.m4
index 84421cef847..75c50087bd0 100644
--- a/m4/extern-inline.m4
+++ b/m4/extern-inline.m4
@@ -1,6 +1,6 @@
 dnl 'extern inline' a la ISO C99.
 
-dnl Copyright 2012-2019 Free Software Foundation, Inc.
+dnl Copyright 2012-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/faccessat.m4 b/m4/faccessat.m4
index 6c7d79b0081..7a8b979f8db 100644
--- a/m4/faccessat.m4
+++ b/m4/faccessat.m4
@@ -1,7 +1,7 @@
 # serial 8
 # See if we need to provide faccessat replacement.
 
-dnl Copyright (C) 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/fcntl.m4 b/m4/fcntl.m4
index e409e96b1c8..562ae2395df 100644
--- a/m4/fcntl.m4
+++ b/m4/fcntl.m4
@@ -1,5 +1,5 @@
 # fcntl.m4 serial 9
-dnl Copyright (C) 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/fcntl_h.m4 b/m4/fcntl_h.m4
index 60dc5e21037..6b253937fd1 100644
--- a/m4/fcntl_h.m4
+++ b/m4/fcntl_h.m4
@@ -1,6 +1,6 @@
 # serial 16
 # Configure fcntl.h.
-dnl Copyright (C) 2006-2007, 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2006-2007, 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/fdopendir.m4 b/m4/fdopendir.m4
index ad48e4ef2d5..d9cc1a00173 100644
--- a/m4/fdopendir.m4
+++ b/m4/fdopendir.m4
@@ -1,7 +1,7 @@
 # serial 12
 # See if we need to provide fdopendir.
 
-dnl Copyright (C) 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/filemode.m4 b/m4/filemode.m4
index c086c680d3c..a1b7e105b59 100644
--- a/m4/filemode.m4
+++ b/m4/filemode.m4
@@ -1,5 +1,6 @@
 # filemode.m4 serial 8
-dnl Copyright (C) 2002, 2005-2006, 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2002, 2005-2006, 2009-2020 Free Software Foundation,
+dnl Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/flexmember.m4 b/m4/flexmember.m4
index c245ab025f6..90f3dddc660 100644
--- a/m4/flexmember.m4
+++ b/m4/flexmember.m4
@@ -1,7 +1,7 @@
 # serial 5
 # Check for flexible array member support.
 
-# Copyright (C) 2006, 2009-2019 Free Software Foundation, Inc.
+# Copyright (C) 2006, 2009-2020 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
diff --git a/m4/fpending.m4 b/m4/fpending.m4
index 402ec403316..ea9725e4890 100644
--- a/m4/fpending.m4
+++ b/m4/fpending.m4
@@ -1,6 +1,6 @@
 # serial 22
 
-# Copyright (C) 2000-2001, 2004-2019 Free Software Foundation, Inc.
+# Copyright (C) 2000-2001, 2004-2020 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
diff --git a/m4/fpieee.m4 b/m4/fpieee.m4
index ea1d5dad4a8..d5c9aefa813 100644
--- a/m4/fpieee.m4
+++ b/m4/fpieee.m4
@@ -1,5 +1,5 @@
 # fpieee.m4 serial 2  -*- coding: utf-8 -*-
-dnl Copyright (C) 2007, 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2007, 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/fstatat.m4 b/m4/fstatat.m4
index 489a55a3151..19583ed1e40 100644
--- a/m4/fstatat.m4
+++ b/m4/fstatat.m4
@@ -1,5 +1,5 @@
 # fstatat.m4 serial 4
-dnl Copyright (C) 2004-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2004-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/fsusage.m4 b/m4/fsusage.m4
index a283f645dda..64fcf5d290d 100644
--- a/m4/fsusage.m4
+++ b/m4/fsusage.m4
@@ -1,7 +1,8 @@
 # serial 34
 # Obtaining file system usage information.
 
-# Copyright (C) 1997-1998, 2000-2001, 2003-2019 Free Software Foundation, Inc.
+# Copyright (C) 1997-1998, 2000-2001, 2003-2020 Free Software
+# Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
diff --git a/m4/fsync.m4 b/m4/fsync.m4
index 1b94a258f97..c86c0e6a53d 100644
--- a/m4/fsync.m4
+++ b/m4/fsync.m4
@@ -1,5 +1,5 @@
 # fsync.m4 serial 2
-dnl Copyright (C) 2008-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2008-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/getdtablesize.m4 b/m4/getdtablesize.m4
index 96aa241b192..ab2e3feb37b 100644
--- a/m4/getdtablesize.m4
+++ b/m4/getdtablesize.m4
@@ -1,5 +1,5 @@
 # getdtablesize.m4 serial 7
-dnl Copyright (C) 2008-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2008-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/getgroups.m4 b/m4/getgroups.m4
index 556c177449b..79436460f30 100644
--- a/m4/getgroups.m4
+++ b/m4/getgroups.m4
@@ -3,7 +3,8 @@
 dnl From Jim Meyering.
 dnl A wrapper around AC_FUNC_GETGROUPS.
 
-# Copyright (C) 1996-1997, 1999-2004, 2008-2019 Free Software Foundation, Inc.
+# Copyright (C) 1996-1997, 1999-2004, 2008-2020 Free Software
+# Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
diff --git a/m4/getloadavg.m4 b/m4/getloadavg.m4
index 333ced781bb..74a116fd10d 100644
--- a/m4/getloadavg.m4
+++ b/m4/getloadavg.m4
@@ -1,7 +1,7 @@
 # Check for getloadavg.
 
-# Copyright (C) 1992-1996, 1999-2000, 2002-2003, 2006, 2008-2019 Free Software
-# Foundation, Inc.
+# Copyright (C) 1992-1996, 1999-2000, 2002-2003, 2006, 2008-2020 Free
+# Software Foundation, Inc.
 
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
diff --git a/m4/getopt.m4 b/m4/getopt.m4
index 8cc78278739..595483d58cb 100644
--- a/m4/getopt.m4
+++ b/m4/getopt.m4
@@ -1,5 +1,5 @@
 # getopt.m4 serial 47
-dnl Copyright (C) 2002-2006, 2008-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2002-2006, 2008-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/gettime.m4 b/m4/gettime.m4
index 60d8ea183bc..6a1f9a4157d 100644
--- a/m4/gettime.m4
+++ b/m4/gettime.m4
@@ -1,5 +1,6 @@
 # gettime.m4 serial 9
-dnl Copyright (C) 2002, 2004-2006, 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2002, 2004-2006, 2009-2020 Free Software Foundation,
+dnl Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/gettimeofday.m4 b/m4/gettimeofday.m4
index 7eebabd9c70..443c6f9309a 100644
--- a/m4/gettimeofday.m4
+++ b/m4/gettimeofday.m4
@@ -1,6 +1,7 @@
 # serial 27
 
-# Copyright (C) 2001-2003, 2005, 2007, 2009-2019 Free Software Foundation, Inc.
+# Copyright (C) 2001-2003, 2005, 2007, 2009-2020 Free Software
+# Foundation, Inc.
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
diff --git a/m4/glibc21.m4 b/m4/glibc21.m4
index 0ab0f235a66..9197d3bf45f 100644
--- a/m4/glibc21.m4
+++ b/m4/glibc21.m4
@@ -1,6 +1,6 @@
 # glibc21.m4 serial 5
-dnl Copyright (C) 2000-2002, 2004, 2008, 2010-2019 Free Software Foundation,
-dnl Inc.
+dnl Copyright (C) 2000-2002, 2004, 2008, 2010-2020 Free Software
+dnl Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/gnulib-common.m4 b/m4/gnulib-common.m4
index d8f0d3fb566..b617eacff01 100644
--- a/m4/gnulib-common.m4
+++ b/m4/gnulib-common.m4
@@ -1,5 +1,5 @@
 # gnulib-common.m4 serial 46
-dnl Copyright (C) 2007-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2007-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/gnulib-comp.m4 b/m4/gnulib-comp.m4
index baf9511aca7..c952c9c956c 100644
--- a/m4/gnulib-comp.m4
+++ b/m4/gnulib-comp.m4
@@ -1,5 +1,5 @@
 # DO NOT EDIT! GENERATED AUTOMATICALLY!
-# Copyright (C) 2002-2019 Free Software Foundation, Inc.
+# Copyright (C) 2002-2020 Free Software Foundation, Inc.
 #
 # This file 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/m4/group-member.m4 b/m4/group-member.m4
index 77d389de693..5b32b5ff498 100644
--- a/m4/group-member.m4
+++ b/m4/group-member.m4
@@ -1,6 +1,7 @@
 # serial 14
 
-# Copyright (C) 1999-2001, 2003-2007, 2009-2019 Free Software Foundation, Inc.
+# Copyright (C) 1999-2001, 2003-2007, 2009-2020 Free Software
+# Foundation, Inc.
 
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
diff --git a/m4/ieee754-h.m4 b/m4/ieee754-h.m4
index b8b9d5dca19..8ec4583348e 100644
--- a/m4/ieee754-h.m4
+++ b/m4/ieee754-h.m4
@@ -1,6 +1,6 @@
 # Configure ieee754-h module
 
-dnl Copyright 2018-2019 Free Software Foundation, Inc.
+dnl Copyright 2018-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/include_next.m4 b/m4/include_next.m4
index 86eb2c97c92..9009e293b53 100644
--- a/m4/include_next.m4
+++ b/m4/include_next.m4
@@ -1,5 +1,5 @@
 # include_next.m4 serial 24
-dnl Copyright (C) 2006-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2006-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/inttypes.m4 b/m4/inttypes.m4
index c58a1bec474..e037be6fcc5 100644
--- a/m4/inttypes.m4
+++ b/m4/inttypes.m4
@@ -1,5 +1,5 @@
 # inttypes.m4 serial 27
-dnl Copyright (C) 2006-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2006-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/largefile.m4 b/m4/largefile.m4
index c6dd9a10032..f6863e46c49 100644
--- a/m4/largefile.m4
+++ b/m4/largefile.m4
@@ -1,6 +1,6 @@
 # Enable large files on systems where this is not the default.
 
-# Copyright 1992-1996, 1998-2019 Free Software Foundation, Inc.
+# Copyright 1992-1996, 1998-2020 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
diff --git a/m4/limits-h.m4 b/m4/limits-h.m4
index 68f724c777e..0b4f092a432 100644
--- a/m4/limits-h.m4
+++ b/m4/limits-h.m4
@@ -1,6 +1,6 @@
 dnl Check whether limits.h has needed features.
 
-dnl Copyright 2016-2019 Free Software Foundation, Inc.
+dnl Copyright 2016-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/localtime-buffer.m4 b/m4/localtime-buffer.m4
index 6d9982879bd..09df3c97f25 100644
--- a/m4/localtime-buffer.m4
+++ b/m4/localtime-buffer.m4
@@ -1,5 +1,5 @@
 # localtime-buffer.m4 serial 1
-dnl Copyright (C) 2017-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2017-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/longlong.m4 b/m4/longlong.m4
index 08d0e36300d..e878488ad54 100644
--- a/m4/longlong.m4
+++ b/m4/longlong.m4
@@ -1,5 +1,5 @@
 # longlong.m4 serial 18
-dnl Copyright (C) 1999-2007, 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 1999-2007, 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/lstat.m4 b/m4/lstat.m4
index be6d3f24b43..3c2b214b857 100644
--- a/m4/lstat.m4
+++ b/m4/lstat.m4
@@ -1,6 +1,6 @@
 # serial 33
 
-# Copyright (C) 1997-2001, 2003-2019 Free Software Foundation, Inc.
+# Copyright (C) 1997-2001, 2003-2020 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
diff --git a/m4/malloca.m4 b/m4/malloca.m4
index 820f40a8a88..99e9dace2c5 100644
--- a/m4/malloca.m4
+++ b/m4/malloca.m4
@@ -1,6 +1,6 @@
 # malloca.m4 serial 1
-dnl Copyright (C) 2003-2004, 2006-2007, 2009-2019 Free Software Foundation,
-dnl Inc.
+dnl Copyright (C) 2003-2004, 2006-2007, 2009-2020 Free Software
+dnl Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/manywarnings.m4 b/m4/manywarnings.m4
index 6bb9f8f84e8..783620da3ad 100644
--- a/m4/manywarnings.m4
+++ b/m4/manywarnings.m4
@@ -1,5 +1,5 @@
 # manywarnings.m4 serial 18
-dnl Copyright (C) 2008-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2008-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/mbstate_t.m4 b/m4/mbstate_t.m4
index f669753c07e..057ce12ebe6 100644
--- a/m4/mbstate_t.m4
+++ b/m4/mbstate_t.m4
@@ -1,5 +1,5 @@
 # mbstate_t.m4 serial 13
-dnl Copyright (C) 2000-2002, 2008-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2000-2002, 2008-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/md5.m4 b/m4/md5.m4
index 59140f57345..ca213ed055f 100644
--- a/m4/md5.m4
+++ b/m4/md5.m4
@@ -1,5 +1,5 @@
 # md5.m4 serial 14
-dnl Copyright (C) 2002-2006, 2008-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2002-2006, 2008-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/memmem.m4 b/m4/memmem.m4
index dcccefa7045..e034d7bd775 100644
--- a/m4/memmem.m4
+++ b/m4/memmem.m4
@@ -1,5 +1,5 @@
 # memmem.m4 serial 26
-dnl Copyright (C) 2002-2004, 2007-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2002-2004, 2007-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/mempcpy.m4 b/m4/mempcpy.m4
index b6090eed285..63e4087784b 100644
--- a/m4/mempcpy.m4
+++ b/m4/mempcpy.m4
@@ -1,6 +1,6 @@
 # mempcpy.m4 serial 11
-dnl Copyright (C) 2003-2004, 2006-2007, 2009-2019 Free Software Foundation,
-dnl Inc.
+dnl Copyright (C) 2003-2004, 2006-2007, 2009-2020 Free Software
+dnl Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/memrchr.m4 b/m4/memrchr.m4
index e907590e38a..8e33fb96a07 100644
--- a/m4/memrchr.m4
+++ b/m4/memrchr.m4
@@ -1,6 +1,6 @@
 # memrchr.m4 serial 10
-dnl Copyright (C) 2002-2003, 2005-2007, 2009-2019 Free Software Foundation,
-dnl Inc.
+dnl Copyright (C) 2002-2003, 2005-2007, 2009-2020 Free Software
+dnl Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/minmax.m4 b/m4/minmax.m4
index 1e0d30b9806..e5b28b0b8b4 100644
--- a/m4/minmax.m4
+++ b/m4/minmax.m4
@@ -1,5 +1,5 @@
 # minmax.m4 serial 4
-dnl Copyright (C) 2005, 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2005, 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/mkostemp.m4 b/m4/mkostemp.m4
index 56f566c9127..3e5b5555582 100644
--- a/m4/mkostemp.m4
+++ b/m4/mkostemp.m4
@@ -1,5 +1,5 @@
 # mkostemp.m4 serial 2
-dnl Copyright (C) 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/mktime.m4 b/m4/mktime.m4
index 405476145c2..5e89f20e979 100644
--- a/m4/mktime.m4
+++ b/m4/mktime.m4
@@ -1,6 +1,6 @@
 # serial 31
-dnl Copyright (C) 2002-2003, 2005-2007, 2009-2019 Free Software Foundation,
-dnl Inc.
+dnl Copyright (C) 2002-2003, 2005-2007, 2009-2020 Free Software
+dnl Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/mode_t.m4 b/m4/mode_t.m4
index ba840dca99d..f1909517c2d 100644
--- a/m4/mode_t.m4
+++ b/m4/mode_t.m4
@@ -1,5 +1,5 @@
 # mode_t.m4 serial 2
-dnl Copyright (C) 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/multiarch.m4 b/m4/multiarch.m4
index d48316e0ed7..3c2034c5e00 100644
--- a/m4/multiarch.m4
+++ b/m4/multiarch.m4
@@ -1,5 +1,5 @@
 # multiarch.m4 serial 7
-dnl Copyright (C) 2008-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2008-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/nocrash.m4 b/m4/nocrash.m4
index 8577038d796..637a0ea45be 100644
--- a/m4/nocrash.m4
+++ b/m4/nocrash.m4
@@ -1,5 +1,5 @@
 # nocrash.m4 serial 5
-dnl Copyright (C) 2005, 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2005, 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/nstrftime.m4 b/m4/nstrftime.m4
index 546c2408277..ec41d42f4ba 100644
--- a/m4/nstrftime.m4
+++ b/m4/nstrftime.m4
@@ -1,6 +1,7 @@
 # serial 34
 
-# Copyright (C) 1996-1997, 1999-2007, 2009-2019 Free Software Foundation, Inc.
+# Copyright (C) 1996-1997, 1999-2007, 2009-2020 Free Software
+# Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
diff --git a/m4/off_t.m4 b/m4/off_t.m4
index 711a2d44fbe..6e19af881ed 100644
--- a/m4/off_t.m4
+++ b/m4/off_t.m4
@@ -1,5 +1,5 @@
 # off_t.m4 serial 1
-dnl Copyright (C) 2012-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2012-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/open-cloexec.m4 b/m4/open-cloexec.m4
index 52498d953b8..11652d5f81c 100644
--- a/m4/open-cloexec.m4
+++ b/m4/open-cloexec.m4
@@ -1,6 +1,6 @@
 # Test whether O_CLOEXEC is defined.
 
-dnl Copyright 2017-2019 Free Software Foundation, Inc.
+dnl Copyright 2017-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/open-slash.m4 b/m4/open-slash.m4
index a8756ae8fea..1e57c96960e 100644
--- a/m4/open-slash.m4
+++ b/m4/open-slash.m4
@@ -1,5 +1,5 @@
 # open-slash.m4 serial 1
-dnl Copyright (C) 2007-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2007-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/open.m4 b/m4/open.m4
index 6cf0bebb176..552eedf8c53 100644
--- a/m4/open.m4
+++ b/m4/open.m4
@@ -1,5 +1,5 @@
 # open.m4 serial 15
-dnl Copyright (C) 2007-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2007-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/pathmax.m4 b/m4/pathmax.m4
index 0770aca3aac..dc6bc3bceba 100644
--- a/m4/pathmax.m4
+++ b/m4/pathmax.m4
@@ -1,6 +1,6 @@
 # pathmax.m4 serial 11
-dnl Copyright (C) 2002-2003, 2005-2006, 2009-2019 Free Software Foundation,
-dnl Inc.
+dnl Copyright (C) 2002-2003, 2005-2006, 2009-2020 Free Software
+dnl Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/pipe2.m4 b/m4/pipe2.m4
index 03008eb0368..d36821ed1aa 100644
--- a/m4/pipe2.m4
+++ b/m4/pipe2.m4
@@ -1,5 +1,5 @@
 # pipe2.m4 serial 2
-dnl Copyright (C) 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/pselect.m4 b/m4/pselect.m4
index 250463d80a3..f3e5afe0b38 100644
--- a/m4/pselect.m4
+++ b/m4/pselect.m4
@@ -1,5 +1,5 @@
 # pselect.m4 serial 8
-dnl Copyright (C) 2011-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2011-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/pthread_sigmask.m4 b/m4/pthread_sigmask.m4
index d788cf656ea..d67511f73dd 100644
--- a/m4/pthread_sigmask.m4
+++ b/m4/pthread_sigmask.m4
@@ -1,5 +1,5 @@
 # pthread_sigmask.m4 serial 18
-dnl Copyright (C) 2011-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2011-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/putenv.m4 b/m4/putenv.m4
index 1267b901bec..e38f8c56940 100644
--- a/m4/putenv.m4
+++ b/m4/putenv.m4
@@ -1,5 +1,5 @@
 # putenv.m4 serial 24
-dnl Copyright (C) 2002-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2002-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/readlink.m4 b/m4/readlink.m4
index 7aa6ce03379..9aa9e46da8c 100644
--- a/m4/readlink.m4
+++ b/m4/readlink.m4
@@ -1,5 +1,5 @@
 # readlink.m4 serial 15
-dnl Copyright (C) 2003, 2007, 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2003, 2007, 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/readlinkat.m4 b/m4/readlinkat.m4
index b63f213d925..6ef1f590c06 100644
--- a/m4/readlinkat.m4
+++ b/m4/readlinkat.m4
@@ -1,7 +1,7 @@
 # serial 5
 # See if we need to provide readlinkat replacement.
 
-dnl Copyright (C) 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/regex.m4 b/m4/regex.m4
index ad36dc2b020..65f518582c1 100644
--- a/m4/regex.m4
+++ b/m4/regex.m4
@@ -1,6 +1,6 @@
 # serial 69
 
-# Copyright (C) 1996-2001, 2003-2019 Free Software Foundation, Inc.
+# Copyright (C) 1996-2001, 2003-2020 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
diff --git a/m4/sha1.m4 b/m4/sha1.m4
index bb74fc72f22..35e3f7580ef 100644
--- a/m4/sha1.m4
+++ b/m4/sha1.m4
@@ -1,5 +1,5 @@
 # sha1.m4 serial 12
-dnl Copyright (C) 2002-2006, 2008-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2002-2006, 2008-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/sha256.m4 b/m4/sha256.m4
index 929583df1c7..85ff1d5ba8a 100644
--- a/m4/sha256.m4
+++ b/m4/sha256.m4
@@ -1,5 +1,5 @@
 # sha256.m4 serial 8
-dnl Copyright (C) 2005, 2008-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2005, 2008-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/sha512.m4 b/m4/sha512.m4
index d5f5594dc7b..fe1592a2600 100644
--- a/m4/sha512.m4
+++ b/m4/sha512.m4
@@ -1,5 +1,5 @@
 # sha512.m4 serial 9
-dnl Copyright (C) 2005-2006, 2008-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2005-2006, 2008-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/sig2str.m4 b/m4/sig2str.m4
index 0474d51d39e..c9b1a860a17 100644
--- a/m4/sig2str.m4
+++ b/m4/sig2str.m4
@@ -1,5 +1,6 @@
 # serial 7
-dnl Copyright (C) 2002, 2005-2006, 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2002, 2005-2006, 2009-2020 Free Software Foundation,
+dnl Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/signal_h.m4 b/m4/signal_h.m4
index 3acec64f881..08684384314 100644
--- a/m4/signal_h.m4
+++ b/m4/signal_h.m4
@@ -1,5 +1,5 @@
 # signal_h.m4 serial 18
-dnl Copyright (C) 2007-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2007-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/socklen.m4 b/m4/socklen.m4
index deb5135fef4..251960b0ac0 100644
--- a/m4/socklen.m4
+++ b/m4/socklen.m4
@@ -1,5 +1,5 @@
 # socklen.m4 serial 11
-dnl Copyright (C) 2005-2007, 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2005-2007, 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/ssize_t.m4 b/m4/ssize_t.m4
index 38bcee1c7d9..b77032b47a3 100644
--- a/m4/ssize_t.m4
+++ b/m4/ssize_t.m4
@@ -1,5 +1,6 @@
 # ssize_t.m4 serial 5 (gettext-0.18.2)
-dnl Copyright (C) 2001-2003, 2006, 2010-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2001-2003, 2006, 2010-2020 Free Software Foundation,
+dnl Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/st_dm_mode.m4 b/m4/st_dm_mode.m4
index 283981f9ddf..9c44ae73dc1 100644
--- a/m4/st_dm_mode.m4
+++ b/m4/st_dm_mode.m4
@@ -1,6 +1,7 @@
 # serial 6
 
-# Copyright (C) 1998-1999, 2001, 2009-2019 Free Software Foundation, Inc.
+# Copyright (C) 1998-1999, 2001, 2009-2020 Free Software Foundation,
+# Inc.
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
diff --git a/m4/stat-time.m4 b/m4/stat-time.m4
index 1685788e05f..59bd29f91ac 100644
--- a/m4/stat-time.m4
+++ b/m4/stat-time.m4
@@ -1,7 +1,7 @@
 # Checks for stat-related time functions.
 
-# Copyright (C) 1998-1999, 2001, 2003, 2005-2007, 2009-2019 Free Software
-# Foundation, Inc.
+# Copyright (C) 1998-1999, 2001, 2003, 2005-2007, 2009-2020 Free
+# Software Foundation, Inc.
 
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
diff --git a/m4/std-gnu11.m4 b/m4/std-gnu11.m4
index 23e7f75f1f4..c1ec624b3b3 100644
--- a/m4/std-gnu11.m4
+++ b/m4/std-gnu11.m4
@@ -7,7 +7,7 @@
 # or later is installed everywhere a Gnulib program might be developed.
 
 
-# Copyright (C) 2001-2019 Free Software Foundation, Inc.
+# Copyright (C) 2001-2020 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/m4/stdalign.m4 b/m4/stdalign.m4
index 601fd21f03b..dcf778e6456 100644
--- a/m4/stdalign.m4
+++ b/m4/stdalign.m4
@@ -1,6 +1,6 @@
 # Check for stdalign.h that conforms to C11.
 
-dnl Copyright 2011-2019 Free Software Foundation, Inc.
+dnl Copyright 2011-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/stddef_h.m4 b/m4/stddef_h.m4
index 979e3cf7e79..6bcfadb74ef 100644
--- a/m4/stddef_h.m4
+++ b/m4/stddef_h.m4
@@ -1,6 +1,6 @@
 dnl A placeholder for <stddef.h>, for platforms that have issues.
 # stddef_h.m4 serial 6
-dnl Copyright (C) 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/stdint.m4 b/m4/stdint.m4
index 11d8e8e52d4..3f75a18f32c 100644
--- a/m4/stdint.m4
+++ b/m4/stdint.m4
@@ -1,5 +1,5 @@
 # stdint.m4 serial 53
-dnl Copyright (C) 2001-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2001-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/stdio_h.m4 b/m4/stdio_h.m4
index 6c9c104044a..c603b514d96 100644
--- a/m4/stdio_h.m4
+++ b/m4/stdio_h.m4
@@ -1,5 +1,5 @@
 # stdio_h.m4 serial 49
-dnl Copyright (C) 2007-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2007-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/stdlib_h.m4 b/m4/stdlib_h.m4
index 6121602aea3..61a3e31edac 100644
--- a/m4/stdlib_h.m4
+++ b/m4/stdlib_h.m4
@@ -1,5 +1,5 @@
 # stdlib_h.m4 serial 48
-dnl Copyright (C) 2007-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2007-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/stpcpy.m4 b/m4/stpcpy.m4
index 7af2e8189e1..0f0fa9eaaed 100644
--- a/m4/stpcpy.m4
+++ b/m4/stpcpy.m4
@@ -1,5 +1,5 @@
 # stpcpy.m4 serial 8
-dnl Copyright (C) 2002, 2007, 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2002, 2007, 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/string_h.m4 b/m4/string_h.m4
index 0c0e3a71af3..4c1f685eabd 100644
--- a/m4/string_h.m4
+++ b/m4/string_h.m4
@@ -1,6 +1,6 @@
 # Configure a GNU-like replacement for <string.h>.
 
-# Copyright (C) 2007-2019 Free Software Foundation, Inc.
+# Copyright (C) 2007-2020 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
diff --git a/m4/strnlen.m4 b/m4/strnlen.m4
index c283c3ece9f..67d4eb05c03 100644
--- a/m4/strnlen.m4
+++ b/m4/strnlen.m4
@@ -1,6 +1,6 @@
 # strnlen.m4 serial 13
-dnl Copyright (C) 2002-2003, 2005-2007, 2009-2019 Free Software Foundation,
-dnl Inc.
+dnl Copyright (C) 2002-2003, 2005-2007, 2009-2020 Free Software
+dnl Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/strtoimax.m4 b/m4/strtoimax.m4
index 9632279a183..de97d75ce67 100644
--- a/m4/strtoimax.m4
+++ b/m4/strtoimax.m4
@@ -1,5 +1,6 @@
 # strtoimax.m4 serial 15
-dnl Copyright (C) 2002-2004, 2006, 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2002-2004, 2006, 2009-2020 Free Software Foundation,
+dnl Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/strtoll.m4 b/m4/strtoll.m4
index 3ba7e223b58..af962836ec6 100644
--- a/m4/strtoll.m4
+++ b/m4/strtoll.m4
@@ -1,5 +1,6 @@
 # strtoll.m4 serial 7
-dnl Copyright (C) 2002, 2004, 2006, 2008-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2002, 2004, 2006, 2008-2020 Free Software Foundation,
+dnl Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/symlink.m4 b/m4/symlink.m4
index 2bec317e9b8..9cfdf93943c 100644
--- a/m4/symlink.m4
+++ b/m4/symlink.m4
@@ -1,7 +1,7 @@
 # serial 9
 # See if we need to provide symlink replacement.
 
-dnl Copyright (C) 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/sys_select_h.m4 b/m4/sys_select_h.m4
index 918212a9465..fa19bb65f6e 100644
--- a/m4/sys_select_h.m4
+++ b/m4/sys_select_h.m4
@@ -1,5 +1,5 @@
 # sys_select_h.m4 serial 20
-dnl Copyright (C) 2006-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2006-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/sys_socket_h.m4 b/m4/sys_socket_h.m4
index d0a902061aa..1471aeaec41 100644
--- a/m4/sys_socket_h.m4
+++ b/m4/sys_socket_h.m4
@@ -1,5 +1,5 @@
 # sys_socket_h.m4 serial 24
-dnl Copyright (C) 2005-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2005-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/sys_stat_h.m4 b/m4/sys_stat_h.m4
index 361ac3fc141..d63df9ebffd 100644
--- a/m4/sys_stat_h.m4
+++ b/m4/sys_stat_h.m4
@@ -1,5 +1,5 @@
 # sys_stat_h.m4 serial 31   -*- Autoconf -*-
-dnl Copyright (C) 2006-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2006-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/sys_time_h.m4 b/m4/sys_time_h.m4
index 3d9233aa998..8fc8599242d 100644
--- a/m4/sys_time_h.m4
+++ b/m4/sys_time_h.m4
@@ -1,7 +1,7 @@
 # Configure a replacement for <sys/time.h>.
 # serial 9
 
-# Copyright (C) 2007, 2009-2019 Free Software Foundation, Inc.
+# Copyright (C) 2007, 2009-2020 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
diff --git a/m4/sys_types_h.m4 b/m4/sys_types_h.m4
index be0655900d5..be918dc0d8b 100644
--- a/m4/sys_types_h.m4
+++ b/m4/sys_types_h.m4
@@ -1,5 +1,5 @@
 # sys_types_h.m4 serial 9
-dnl Copyright (C) 2011-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2011-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/tempname.m4 b/m4/tempname.m4
index 664a6322f38..da439f07b58 100644
--- a/m4/tempname.m4
+++ b/m4/tempname.m4
@@ -1,6 +1,6 @@
 #serial 5
 
-# Copyright (C) 2006-2007, 2009-2019 Free Software Foundation, Inc.
+# Copyright (C) 2006-2007, 2009-2020 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
diff --git a/m4/time_h.m4 b/m4/time_h.m4
index f08f29b35ea..e4fe59084f8 100644
--- a/m4/time_h.m4
+++ b/m4/time_h.m4
@@ -1,6 +1,7 @@
 # Configure a more-standard replacement for <time.h>.
 
-# Copyright (C) 2000-2001, 2003-2007, 2009-2019 Free Software Foundation, Inc.
+# Copyright (C) 2000-2001, 2003-2007, 2009-2020 Free Software
+# Foundation, Inc.
 
 # serial 11
 
diff --git a/m4/time_r.m4 b/m4/time_r.m4
index cc4b3e009b9..0e86d4496c5 100644
--- a/m4/time_r.m4
+++ b/m4/time_r.m4
@@ -1,6 +1,6 @@
 dnl Reentrant time functions: localtime_r, gmtime_r.
 
-dnl Copyright (C) 2003, 2006-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2003, 2006-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/time_rz.m4 b/m4/time_rz.m4
index 5564559c867..2dd64b28488 100644
--- a/m4/time_rz.m4
+++ b/m4/time_rz.m4
@@ -1,6 +1,6 @@
 dnl Time zone functions: tzalloc, localtime_rz, etc.
 
-dnl Copyright (C) 2015-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2015-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/timegm.m4 b/m4/timegm.m4
index d9d40de69a7..67c0c3b5f1b 100644
--- a/m4/timegm.m4
+++ b/m4/timegm.m4
@@ -1,5 +1,5 @@
 # timegm.m4 serial 12
-dnl Copyright (C) 2003, 2007, 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2003, 2007, 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/timer_time.m4 b/m4/timer_time.m4
index 347d04dbe45..fdb288df24b 100644
--- a/m4/timer_time.m4
+++ b/m4/timer_time.m4
@@ -1,5 +1,5 @@
 # timer_time.m4 serial 4
-dnl Copyright (C) 2011-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2011-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/timespec.m4 b/m4/timespec.m4
index 3db9943a74a..5ed82b109c6 100644
--- a/m4/timespec.m4
+++ b/m4/timespec.m4
@@ -1,6 +1,7 @@
 #serial 15
 
-# Copyright (C) 2000-2001, 2003-2007, 2009-2019 Free Software Foundation, Inc.
+# Copyright (C) 2000-2001, 2003-2007, 2009-2020 Free Software
+# Foundation, Inc.
 
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
diff --git a/m4/tm_gmtoff.m4 b/m4/tm_gmtoff.m4
index 31b841fe597..41517d8abfb 100644
--- a/m4/tm_gmtoff.m4
+++ b/m4/tm_gmtoff.m4
@@ -1,5 +1,5 @@
 # tm_gmtoff.m4 serial 3
-dnl Copyright (C) 2002, 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2002, 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/unistd_h.m4 b/m4/unistd_h.m4
index 18b7140e598..7453866df84 100644
--- a/m4/unistd_h.m4
+++ b/m4/unistd_h.m4
@@ -1,5 +1,5 @@
 # unistd_h.m4 serial 76
-dnl Copyright (C) 2006-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2006-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/unlocked-io.m4 b/m4/unlocked-io.m4
index ea55a1a2d82..38658e63ac4 100644
--- a/m4/unlocked-io.m4
+++ b/m4/unlocked-io.m4
@@ -1,6 +1,6 @@
 # unlocked-io.m4 serial 15
 
-# Copyright (C) 1998-2006, 2009-2019 Free Software Foundation, Inc.
+# Copyright (C) 1998-2006, 2009-2020 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
diff --git a/m4/utimens.m4 b/m4/utimens.m4
index 6ed65934064..65617ac862c 100644
--- a/m4/utimens.m4
+++ b/m4/utimens.m4
@@ -1,4 +1,4 @@
-dnl Copyright (C) 2003-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2003-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/utimes.m4 b/m4/utimes.m4
index 703f823ad53..e1056bbba4e 100644
--- a/m4/utimes.m4
+++ b/m4/utimes.m4
@@ -1,7 +1,7 @@
 # Detect some bugs in glibc's implementation of utimes.
 # serial 7
 
-dnl Copyright (C) 2003-2005, 2009-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2003-2005, 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/vararrays.m4 b/m4/vararrays.m4
index 98a4ef0be8f..49ded2efe0d 100644
--- a/m4/vararrays.m4
+++ b/m4/vararrays.m4
@@ -4,7 +4,7 @@
 
 # From Paul Eggert
 
-# Copyright (C) 2001, 2009-2019 Free Software Foundation, Inc.
+# Copyright (C) 2001, 2009-2020 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
diff --git a/m4/warnings.m4 b/m4/warnings.m4
index 235cac6171c..d272365f0a1 100644
--- a/m4/warnings.m4
+++ b/m4/warnings.m4
@@ -1,5 +1,5 @@
 # warnings.m4 serial 14
-dnl Copyright (C) 2008-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2008-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/m4/wchar_t.m4 b/m4/wchar_t.m4
index 5db5815209d..e48d4649322 100644
--- a/m4/wchar_t.m4
+++ b/m4/wchar_t.m4
@@ -1,5 +1,5 @@
 # wchar_t.m4 serial 4 (gettext-0.18.2)
-dnl Copyright (C) 2002-2003, 2008-2019 Free Software Foundation, Inc.
+dnl Copyright (C) 2002-2003, 2008-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.