Ensure to not be able to call s9y files under circumstances where .htaccess does not deny request AND register_globals is turned on

include/functions_smarty.inc.php

@@ -2,6 +2,10 @@
 # Copyright (c) 2003-2005, Jannis Hermanns (on behalf the Serendipity Developer Team)
 # All rights reserved.  See LICENSE file for licensing details
 
+if (IN_serendipity !== true) {
+    die ("Don't hack!");
+}
+
 if (defined('S9Y_FRAMEWORK_SMARTY')) {
     return;
 }
@@ -354,7 +358,7 @@ function serendipity_smarty_showCommentForm($params, &$smarty) {
     if (!isset($params['data'])) {
         $params['data'] = $serendipity['POST'];
     }
-  
+
     if (!isset($params['showToolbar'])) {
         $params['showToolbar'] = true;
     }