diff --git a/date_ical.install b/date_ical.install
index dc55b4725da6978018ace7eec2d2b56e07b2fdde..c3f43f2e5217eab646f0a84aac7e356cb56fa506 100644
--- a/date_ical.install
+++ b/date_ical.install
@@ -13,27 +13,38 @@ function date_ical_requirements($phase) {
   // Ensure translations don't break at install time.
   $t = get_t();
   
-  switch ($phase) {
-    case 'runtime':
-      $library = libraries_detect('iCalcreator');
-      if ($library && !empty($library['installed'])) {
-        $requirements['date_ical'] = array(
-          'title' => $t('Date iCal'),
-          'value' => $t('iCalcreator library is installed, version: @version found', array('@version' => $library['version'])),
-          'severity' => REQUIREMENT_OK,
-        );
-      }
-      else {
-        $requirements['date_ical'] = array(
-          'title' => $t('Date iCal'),
-          'value' => $t('iCalcreator library could not be found, check the installation instructions for the Date iCal module.'),
-          'description' => $t('The error message was: @error<br>!error_message',
-            array('@error' => $library['error'], '!error_message' => $library['error message'])
-          ),
-          'severity' => REQUIREMENT_ERROR,
-        );
-      }
-      break;
+  if ($phase == 'runtime') {
+    if (!function_exists('libraries_detect')) {
+      $requirements['date_ical'] = array(
+        'title' => $t('Date iCal'),
+        'value' => $t('Libraries module is not installed.'),
+        'description' => $t('Date iCal 2.x and above require the Libraries module. Please install it from !here.',
+          array('!here' => l('here', 'http://www.drupal.org/project/libraries'))
+        ),
+        'severity' => REQUIREMENT_ERROR,
+      );
+      // Return immediately, since we can't even attempt to determine if iCalcreator is installed.
+      return $requirements;
+    }
+    
+    $library = libraries_detect('iCalcreator');
+    if ($library && !empty($library['installed'])) {
+      $requirements['date_ical'] = array(
+        'title' => $t('Date iCal'),
+        'value' => $t('iCalcreator library is installed, version: @version found', array('@version' => $library['version'])),
+        'severity' => REQUIREMENT_OK,
+      );
+    }
+    else {
+      $requirements['date_ical'] = array(
+        'title' => $t('Date iCal'),
+        'value' => $t('iCalcreator library could not be found, check the installation instructions for the Date iCal module.'),
+        'description' => $t('The error message was: @error<br>!error_message',
+          array('@error' => $library['error'], '!error_message' => $library['error message'])
+        ),
+        'severity' => REQUIREMENT_ERROR,
+      );
+    }
   }
   
   return $requirements;