Index: includes/install.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/install.inc,v
retrieving revision 1.55
diff -u -u -p -r1.55 install.inc
--- includes/install.inc	18 Dec 2007 10:31:42 -0000	1.55
+++ includes/install.inc	18 Dec 2007 22:23:42 -0000
@@ -251,7 +251,7 @@ function drupal_rewrite_settings($settin
 function drupal_get_install_files($module_list = array()) {
   $installs = array();
   foreach ($module_list as $module) {
-    $installs = array_merge($installs, file_scan_directory('./modules', "^$module.install$", array('.', '..', 'CVS'), 0, TRUE, 'name', 0));
+    $installs = array_merge($installs, drupal_system_listing("$module.install$", 'modules'));
   }
   return $installs;
 }
@@ -719,7 +719,11 @@ function drupal_check_module($module) {
       // Print any error messages
       foreach ($requirements as $requirement) {
         if (isset($requirement['severity']) && $requirement['severity'] == REQUIREMENT_ERROR) {
-          drupal_set_message($requirement['description'] .' ('. t('Currently using !item !version', array('!item' => $requirement['title'], '!version' => $requirement['value'])) .')', 'error');
+          $message = $requirement['description'];
+          if ($requirement['value']) {
+            $message .= ' ('. st('Currently using !item !version', array('!item' => $requirement['title'], '!version' => $requirement['value'])) .')';
+          }
+          drupal_set_message($message, 'error');
         }
       }
       return FALSE;