Index: core/install/prerequisites.php
===================================================================
--- core/install/prerequisites.php
+++ core/install/prerequisites.php
@@ -127,7 +127,7 @@
 			}
 
 			$ret['url_rewriting'] = $mod_rewrite;
-			$ret['memcache'] = class_exists('Memcache');
+			$ret['memcache'] = class_exists('Memcache') || class_exists('Memcached');
 			$ret['curl'] = function_exists('curl_init');
 			$ret['simplexml'] = function_exists('simplexml_load_string');
 			$ret['spl'] = function_exists('spl_autoload_register');