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>