Index: wp-includes/http.php
===================================================================
--- wp-includes/http.php	(revision 10187)
+++ wp-includes/http.php	(working copy)
@@ -1062,7 +1062,7 @@
 	 * @return boolean False means this class can not be used, true means it can.
 	 */
 	function test() {
-		if ( function_exists('curl_init') )
+		if ( function_exists('curl_init') && function_exists('curl_exec') )
 			return true;
 
 		return false;