you can add "PDO extension" in LSPHP in two ways:
1. recompile lsphp
you need to go through LSPHP compile process (http://www.litespeedtech.com/support...wiki:php:lsapi) with "--with-pdo-extension" or "--with-pdo-extension=shared" option added. put "extension=pdo-extension.so" in php.ini for shared object built.
I'm assuming also that if we have already some -with... that I will have to include them and add the other options as well or during the compilation Litespeed will include the current options automatically + the new ones that I will add ?