fix "PHP Extensions “0” must be loaded" when magento locally install

Replace in file app/code/core/Mage/Install/etc/config.xml (near 71th string):

<extensions>
    <pdo_mysql></pdo_mysql>
</extensions>

with this

<extensions>
    <pdo_mysql>1</pdo_mysql>
</extensions>

Thanks : http://stackoverflow.com/