PHP extensions Disabled

I am trying to install open atrium on my vps and this errors:

Web server	Apache/2.4.10 (Unix) OpenSSL/1.0.1e-fips mod_bwlimited/1.4
OK
PHP	5.4.36
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	800M
OK
File system	Writable (public download method)
OK
Unicode library	PHP Mbstring Extension
OK
PHP memory limit	800M
Info
SimpleXML	Enabled
SimpleXML PHP module is required for Feeds Syndication Parser.
Info
SimplePie	Unknown at install time.
SimplePie library is required for Feeds SimplePie Parser.
OK
Settings file	The ./sites/default/settings.php file exists.
OK
Settings file	The settings file is writable.

I went to PHP Extensions and have enabled it, and also enabled it from easy apache but I still get this errors?

What Should I do?