Error message trying to install Drupal with PDO support.
See below.

Fatal error: Class 'PDO' not found in /home/spetak5/public_html/drupal/includes/database/database.inc on lin


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OK
Web server Apache
OK
PHP 5.4.3
OK
PHP register globals Disabled
Error
PHP extensions Disabled
Drupal requires you to enable the PHP extensions in the following list (see the system requirements page for more information):

pdo

Error
Database support Disabled
Your web server does not appear to support PDO (PHP Data Objects). Ask your hosting provider if they support the native PDO extension. See the system requirements page for more information.
OK
PHP memory limit 128M
OK
File system Writable (public download method)
OK
Unicode library PHP Mbstring Extension
OK
Settings file The ./sites/default/settings.php file exists.
OK
Settings file The settings file is writable.