I have already done much digging on installing/enabling PDO mysql extension on stackoverflow and many other sites, so please do not consider this as a duplicate question
I am on centos 6.5 and has php 5.5.26 which was compiled with
make, make install
@Peter Darmis was right from his comments.
PHP 5.3.3 was not completely uninstalled, don't know why.
There was already a PHP installed manually be compilation and, as I wasn't aware about this, I was using
yum for installation of modules and at that time PHP 5.3.3 got installed which I don't know why it dot un-install properly.
So I ended up with 2 PHP versions, so uninstalled PHP 5.3.3 completely using
yum and then resolved this issue compiling PHP with pdo options