Squirrelmail (Problemas)

Segui o artigo: https://under-linux.org/modules.php?...icle&artid=132 e quando digito: (http://localhost/webmail/src/login.php) aparece o seguinte erro:

"
Warning: main(../config/config.php): failed to open stream: No such file or directory in /usr/local/apache2/htdocs/webmail/functions/global.php on line 16

Fatal error: main(): Failed opening required '../config/config.php' (include_path='.:/usr/local/lib/php') in /usr/local/apache2/htdocs/webmail/functions/global.php on line 16
"

Como corrigir isso?