Index: config-default.inc.php
--- config-default.inc.php.orig
+++ config-default.inc.php
@@ -4,7 +4,7 @@
  * Copy this file in config.inc.php, and override the values you need.
 */
 
-$rcmail_config['ldapAliasSync'] = array(
+$config['ldapAliasSync'] = array(
 	// Mail parameters
 	'mail' => array(
 		# Domain to use for LDAP searches (required, if 'replace_domain' is true)