Warning: include(Zend/Log.php): failed to open stream: No such file or directory in /var/www/dev.gerbing.com/lib/Varien/Autoload.php on line 93

Warning: include(): Failed opening 'Zend/Log.php' for inclusion (include_path='/var/www/dev.gerbing.com/app/code/local:/var/www/dev.gerbing.com/app/code/community:/var/www/dev.gerbing.com/app/code/core:/var/www/dev.gerbing.com/lib:.:/usr/share/php:/usr/share/pear') in /var/www/dev.gerbing.com/lib/Varien/Autoload.php on line 93

Fatal error: Class 'Zend_Log' not found in /var/www/dev.gerbing.com/app/code/core/Mage/Core/functions.php on line 247