AlternC/etc/alternc/templates/apache2/local.conf

<VirtualHost *:80>
    ServerName %%fqdn%%
    DocumentRoot "%%document_root%%"
    <Directory "%%document_root%%">
        php_admin_value open_basedir "%%document_root%%:/var/alternc/dns/redir:/usr/share/php/:/var/alternc/tmp:/tmp"
    </Directory>
</VirtualHost>