php-pdo ought to Provide an abi of its own, as I discovered during a
mismatched-upgrade of my own the other day:

"PHP Fatal error:  PDO: driver mysql requires PDO API version 20060409; this is
PDO version 20051128 in Unknown on line 0"

Note that was my own mysql pdo from when the box was fc4, but since there are
bdo objects not packaged with php on fedora, exporting the PDO API/ABI would
allow externally built pdo packages to stay in sync with fedora php.