internal patch; not suitable for upstream

--- tiff-4.0.4/config/test-driver~ 2012-08-19 09:57:23.000000000 -0700

+++ tiff-4.0.4/config/test-driver 2015-07-13 00:47:17.600616189 -0700

@@ -1,7 +1,7 @@

#! /bin/sh

# test-driver - basic driver script for the 'parallel-tests' mode.

-scriptversion=2012-06-27.10; # UTC

+scriptversion=2015-07-13.07; # UTC

# Copyright (C) 2011-2012 Free Software Foundation, Inc.

#

@@ -29,7 +29,8 @@

# Make unconditional expansion of undefined variables an error. This

# helps a lot in preventing typo-related bugs.

-set -u

+# ... but breaks libtool's wrapper scripts.

+set +u

usage_error ()

{