PDO driver for PostgreSQL in WAMP Server

> I need to use PDO and PostgreSQL. I use WAMPSERVER Version 2.0, Apache
> Version 2.2.11, PHP Version 5.2.9-2.
> I uncommented (in php.ini) line
> extension=php_pdo_pgsql.dll
> I have such file in ext/.
> extension=php_pdo.dll I had already enabled.
> My phpinfo returns
> PDO drivers mysql, sqlite
> I mean it doesn't tell anything about pgsql.
> (I rebooted my computer.)
> Please help.

Click the Wampserver tasktray icon, select "PHP -> PHP extensions" and