For Fedora Core 4, it made sense to have these packages added in Extras :
php-pecl-pdo
php-pecl-pdo-sqlite

But starting with FC5's PHP 5.1.2 there is now a main "php-pdo" sub-package
which contains the same thing as the two above. I will have them removed from
Extras for FC5 and FC development, but php-pdo will need to have :

Obsoletes: php-pecl-pdo <= 1.0.2-3
Obsoletes: php-pecl-pdo-sqlite <= 0.3-5

So that upgrades go smoothly. And eventually :

Provides: php-pecl-pdo = %{version}-%{release}
Provides: php-pecl-pdo-sqlite = %{version}-%{release}

Alhough I don't think those provides would be really useful, and wouldn't
reflect the actual module version as found on pecl.php.net, but have PHP's
version instead.

See bug #191625 and bug #191627 for the report of the initial problem.