Merged revisions 263724,267819 via svnmerge from

https://origsvn.digium.com/svn/asterisk/trunk

........
  r263724 | tilghman | 2010-05-17 18:49:15 -0500 (Mon, 17 May 2010) | 8 lines
  
  Cache sound tarfiles in a common directory, such that a clean reinstall does not force a re-download of the tarballs.
  
  (closes issue #15370)
   Reported by: pprindeville
   Patches: 
         asterisk-trunk-bugid15370.patch uploaded by pprindeville (license 347)
   Tested by: pprindeville, tilghman, seanbright
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  r267819 | tilghman | 2010-06-03 20:36:46 -0500 (Thu, 03 Jun 2010) | 2 lines
  
  If there's a default, turn it on, even when the option isn't specified.
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git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.6.2@267820 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 22 insertions, 0 deletions

diff --git a/autoconf/ast_ext_lib.m4 b/autoconf/ast_ext_lib.m4
index d35d51598..5e675dbe9 100644
--- a/autoconf/ast_ext_lib.m4
+++ b/autoconf/ast_ext_lib.m4
@@ -36,6 +36,28 @@ AC_DEFUN([AST_EXT_LIB_SETUP],
     AC_SUBST([PBX_$1])
 ])
 
+# AST_OPTION_ONLY([option name], [option variable], [option description], [default value])
+AC_DEFUN([AST_OPTION_ONLY],
+[
+AC_ARG_WITH([$1], AC_HELP_STRING([--with-$1=PATH], [use $3 in PATH]),
+	[
+	case ${withval} in
+	n|no)
+		unset $2
+		;;
+	*)
+		if test "x${$2}" = "x"; then
+			m4_ifval($4, [$2="$4"], [:])
+		else
+			$2="${withval}"
+		fi
+		;;
+	esac
+	],
+	[m4_ifval($4, [$2="$4"])])
+AC_SUBST($2)
+])
+
 # AST_EXT_LIB_SETUP_DEPENDENT([package symbol name], [package friendly name], [master package symbol name], [master package option name])
 
 AC_DEFUN([AST_EXT_LIB_SETUP_DEPENDENT],