Don't use an undocumented Autoconf macro.
diff --git a/libcharset/ChangeLog b/libcharset/ChangeLog
index b6736d5..a2983a5 100644
--- a/libcharset/ChangeLog
+++ b/libcharset/ChangeLog
@@ -1,3 +1,8 @@
+2018-01-23 Bruno Haible <bruno@clisp.org>
+
+ Don't use an undocumented Autoconf macro.
+ * configure.ac: Use AC_CONFIG_HEADERS instead of AC_CONFIG_HEADER.
+
2017-07-15 Bruno Haible <bruno@clisp.org>
Get rid of autom4te.cache directories, as far as possible.
diff --git a/libcharset/configure.ac b/libcharset/configure.ac
index ef3167f..4a4fb9e 100644
--- a/libcharset/configure.ac
+++ b/libcharset/configure.ac
@@ -1,4 +1,4 @@
-dnl Copyright (C) 2000-2003, 2005-2009, 2016 Free Software Foundation, Inc.
+dnl Copyright (C) 2000-2003, 2005-2009, 2016, 2018 Free Software Foundation, Inc.
dnl This file is part of the GNU CHARSET Library.
dnl
dnl The GNU CHARSET Library is free software; you can redistribute it and/or
@@ -19,7 +19,7 @@
AC_INIT([libcharset], [1.4])
AC_CONFIG_SRCDIR([lib/localcharset.c])
AC_CONFIG_AUX_DIR([build-aux])
-AC_CONFIG_HEADER([config.h])
+AC_CONFIG_HEADERS([config.h])
AC_PROG_MAKE_SET
dnl checks for basic programs
