#! /bin/sh
-# Copyright (C) 2012 Free Software Foundation, Inc.
+# Copyright (C) 2012-2013 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
# in the face of variables defined through line-continuations,
# automake rewrites and expansions of empty variables.
+# NOTE: keep this file Bourne-compatible, for the sake of systems with
+# non-POSIX /bin/sh (like Solaris).
+
set -e
set -u