function concat(text, integer) does not exist, Postgres 8.3

After creating a nolink item, Drupal drops the next error:

* warning: pg_query() [function.pg-query]: Query failed: ERROR: function concat(text, integer) does not exist LINE 1: UPDATE menu_links SET link_path=CONCAT(CONCAT(link_path,'/')... ^ HINT: No function matches the given name and argument types. You might need to add explicit type casts. in /var/www/../html/includes/database.pgsql.inc on line 139.

* user warning: query: UPDATE menu_links SET link_path=CONCAT(CONCAT(link_path,'/'),mlid) WHERE (link_path='nolink' OR link_path='separator') AND hidden!=-1 in /var/www/../html/sites/all/modules/special_menu_items/special_menu_items.module on line 228.

I run Postgres 8.3, and there is no CONCAT() function for pg8.3
http://community.mybboard.net/thread-39382.html