2007-08-22  Stepan Kasal  <address@hidden>

	* lib/m4sugar/m4sh.m4 (AS_UNSET): Do not call export the
	variable when the neutralizing value is used.

Index: lib/m4sugar/m4sh.m4
===================================================================
RCS file: /cvsroot/autoconf/autoconf/lib/m4sugar/m4sh.m4,v
retrieving revision 1.209
diff -u -r1.209 m4sh.m4
--- lib/m4sugar/m4sh.m4	20 Jul 2007 23:11:54 -0000	1.209
+++ lib/m4sugar/m4sh.m4	22 Aug 2007 11:57:48 -0000
@@ -542,7 +542,7 @@
 # VALUE-IF-UNSET-NOT-SUPPORTED.  `as_unset' must have been computed.
 m4_defun([AS_UNSET],
 [AS_REQUIRE([_AS_UNSET_PREPARE])dnl
-$as_unset $1 || test "${$1+set}" != set || { $1=$2; export $1; }])
+$as_unset $1 || test "${$1+set}" != set || $1=$2])