This page states
"You may need to enable the PDO driver for your database of choice; consult the documentation for [database-specific PDO drivers] to find out more about that."
With the term "database-specific PDO drivers" being a link to this information. However you will no find this information on that or any of the pages that it in turn links to.
The appropriate config options seems to be only available by running ./config --help from the source directory after running autoconf.
Here is the related output from running that command:
--with-pdo-dblib[=DIR] PDO: DBLIB-DB support. DIR is the FreeTDS home directory
--with-pdo-firebird[=DIR] PDO: Firebird support. DIR is the Firebird base
install directory [/opt/firebird]
--with-pdo-mysql[=DIR] PDO: MySQL support. DIR is the MySQL base directoy
If mysqlnd is passed as DIR, the MySQL native
native driver will be used [/usr/local]
--with-zlib-dir[=DIR] PDO_MySQL: Set the path to libz install prefix
--with-pdo-oci[=DIR] PDO: Oracle OCI support. DIR defaults to $ORACLE_HOME.
for an Oracle Instant Client SDK.
For Linux with 10.2.0.3 RPMs (for example) use:
PDO: Support for 'flavour' ODBC driver.
include and lib dirs are looked for under 'dir'.
'flavour' can be one of: ibm-db2, iODBC, unixODBC, generic
If ',dir' part is omitted, default for the flavour
you have selected will used. e.g.:
will check for unixODBC under /usr/local. You may attempt
to use an otherwise unsupported driver using the "generic"
flavour. The syntax for generic ODBC support is:
When build as shared the extension filename is always pdo_odbc.so
--with-pdo-pgsql[=DIR] PDO: PostgreSQL support. DIR is the PostgreSQL base
install directory or the path to pg_config
PDO: sqlite 3 support. DIR is the sqlite base
install directory [BUNDLED]
So if you wish for instance to install the PostgreSQL PDO driver, then you should add the --with-pdo-pgsql config option before compiling PHP. I may have made mistakes in my explination, however it appears to work and was my best guess given the absence of the mentioned documentation.