I've come across a couple of instances of people on Red Hat-based distributions (including Fedora and CentOS) who encounter fatal errors in the setup wizard when the php-xml package (which provides the PHP5 XML functions, including the DOMDocument class) is not installed. I realise this is a distro bug rather than an eZ one, but it would be nice if the Finetune function in the setup wizard could detect this, as it does for database drivers, etc.

Steps to reproduce

1. Ensure the php-xml package is not installed
2. Attempt to install eZ publish