The current pdo sqlite extension is release 1.0.1
I've just discovered that FC's PHP 5.1.3 has php-pdo and includes the PDO extension, as well as the sqlite one. The solution here seems to have the "php-pecl-pdo*" packages removed and php-pdo to obsolete them.
The obsoletes were already in place, I just hasn't been notified about it. The packages have now been removed, so all you need is php-pdo and php-devel from now on.