under mac php shows Fatal error: Cannot redeclare class, but under linux everything runs fine
<p>The error message is </p>

<pre><code>Fatal error: Cannot redeclare class Zbcommon in /Users/apple/Sites/maemvl.com/application/libraries/Zbcommon.php on line 3 
</code></pre>

<p>But there is no other duplicated class exist.
And the message only shows under mac. Under linux server everything works fine.
The code is same between both mac and linux, I coudn't figure out where is the problem.</p>
