[VuFind-Tech] Installation Error

[Sean F <str...@ya...>]

I am trying to install vufind 1.3  on Mac OS but I have an error that I cannot solve:
[client ::1] PHP Fatal error:  require_once(): Failed opening required 'Smarty/Smarty.class.php' (include_path='.:/usr/local/pear/share/pear:/usr/local/share/pear') in /usr/local/vufind/web/sys/Interface.php on line 28

Does anyone know how I can fix it? 
Thank you