PHP 4
The option --with-mysql is
enabled by default. This default behavior may be disabled with the
--without-mysql configure option.
If MySQL is enabled without specifying the path to the
MySQL install DIR, PHP will use the bundled MySQL client libraries.
Users who run other applications that use MySQL (for example,
auth-mysql) should not use the bundled library, but rather specify the
path to MySQL's install directory, like so:
--with-mysql=/path/to/mysql.
This will force PHP to use the client libraries installed by MySQL, thus
avoiding any conflicts.