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As of PHP 5 this extension is enabled by default, so simply do not disable it and it'll be available.
PHP Fatal error: Class 'SQLiteDatabase' not found
On Linux or Unix operating systems, if you build PDO as a shared extension, you must build SQLite as a shared extension using the --with-sqlite=shared configure option.
file is encrypted or is not a database
On CentOS 5, the "yum install php" command loads PHP5.1.6. Why would that be?
yum [fedoraproject.org] is a software package manager that installs, updates, and removes packages on RPM-based systems. It automatically computes dependencies and figures out what things should occur to install packages. yum makes it easier to maintain groups of machines without having to manually update each one using rpm.
See also: rpm [fedoraproject.org]