errors with PostgreSQL

I tried install ldap_integration-5.x-1.3 on my server with postgreSQL db. Modules didn't work.
For example
ldapauth.install row 82

    case 'pgsql':
      $ret[] = update_sql("ALTER TABLE {ldapauth} ADD mail_attr VARCHAR(255) NOT NULL default '' AFTER user_attr ");

but postgreSQL haven't available "AFTER" ...
look http://www.postgresql.org/docs/8.3/static/sql-altertable.html

Could you check code to compatible with postgreSQL.
Thaks
Skoba