Merged revisions 279501 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.6.2

........
  r279501 | seanbright | 2010-07-26 11:41:13 -0400 (Mon, 26 Jul 2010) | 5 lines
  
  Expand the correct value within AST_OPTION_ONLY.
  
  (closes issue #17703)
  Reported by: stuarth
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@279502 65c4cc65-6c06-0410-ace0-fbb531ad65f3

autoconf/ast_ext_lib.m4

@@ -46,7 +46,7 @@ AC_ARG_WITH([$1], AC_HELP_STRING([--with-$1=PATH], [use $3 in PATH]),
 		unset $2
 		;;
 	*)
-		if test "x${$2}" = "x"; then
+		if test "x${withval}" = "x"; then
 			m4_ifval($4, [$2="$4"], [:])
 		else
 			$2="${withval}"