VirtualHost multiple dev environments

devenv.conf

<VirtualHost *:80>
        ServerAdmin webmaster@localhost
        VirtualDocumentRoot "/var/www/%0"

        ServerName localhost
        ServerAlias *

        ErrorLog ${APACHE_LOG_DIR}/error.log
        CustomLog ${APACHE_LOG_DIR}/access.log combined

        LogLevel debug

        <Directory /var/www>
                Options Indexes FollowSymLinks MultiViews
                AllowOverride All
                Order allow,deny
                Allow from all
        </Directory>
</VirtualHost>