I tried to install Oracle Client in Ubuntu latest version.Got some problem and also unable to resolve it.Please reply asap.

Error Msg:libpq.so.57 is empty,not checked



Question: How do I make the country field unrequired?
Answer: The address validation is done in Mage_Customer_Model_Address_Abstract::validate.
You need to copy this class in the local folder (because you cannot rewrite it in a clean way) and remove the lines that validate the country

    if (!Zend_Validate::is($this-&gt;getCountryId(), 'NotEmpty')) {
        $errors[] = Mage::helper('customer')-&gt;__('Please enter the country.');
    }