Programming :: Php Pear Installation / Failed To Open Stream: No Such File Or Directory?

I was attempting the pear installation as per the instructions given here:url

I think i got the installation correct.

Then i tried this program

<?php
require_once 'System/Folders.php';
$sf = new System_Folders();
$home = $sf->getHome();
echo "$home
";
?>

and compiled it as follows:-

php spear.php

to get the results as

Warning: require_once(System/Folders.php): failed to open stream: No such file or directory in /var/www/spear.php on line 3
Fatal error: require_once(): Failed opening required 'System/Folders.php' (include_path='.:/opt/ZendFramework/current/library:/usr/share/php5:/usr/share/pear') in /var/www/spear.php on line 3

how should i correctly set the path in /etc/php5/apache2/php.ini

or how correct is my path statement

include_path = ".:/opt/ZendFramework/current/library:/usr/share/php5:/usr/share/pear"

in /etc/php5/apache2/php.ini