Use --with-pdo-oci[=DIR] to install the PDO Oracle OCI extension, where the optional [=DIR] is the Oracle Home directory. [=DIR] defaults to the $ORACLE_HOME environment variable.
Use --with-pdo-oci=instantclient,prefix,version for an Oracle Instant Client SDK, where prefix and version are configured.
// Using $ORACLE_HOME $ ./configure --with-pdo-oci // Using OIC for Linux with 10.2.0.3 RPMs with a /usr prefix $ ./configure --with-pdo-oci=instantclient,/usr,10.2.0.3