Index: fb.install
===================================================================
--- fb.install	(revision 3607)
+++ fb.install	(working copy)
@@ -6,6 +6,11 @@
  *
  */

+// Normally fb_settings.inc is included in settings.php or by fb.module, but that is not available during update.php.
+if (!function_exists('fb_settings')) {
+  module_load_include('inc', 'fb', 'fb_settings');
+}
+
 /**
  * Implementation of hook_requirements().
  */