reference the config file without relying on working directory

setup.php

@@ -17,7 +17,7 @@
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
-require_once('common_config.php');
+require_once(__DIR__.'/common_config.php');
 if(!extension_loaded('pdo_mysql')){
 	die($I['pdo_mysqlextrequired']);
 }