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if (!defined('CAKE_CORE_INCLUDE_PATH')) {
	define('CAKE_CORE_INCLUDE_PATH', ROOT);
}

with this:

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if (!defined('CAKE_CORE_INCLUDE_PATH')) {
	define('CAKE_CORE_INCLUDE_PATH', DS . 'usr' . DS . 'lib' . DS . 'php' . DS . 'cake');
}

You are now using the common cake core. When a new update comes out to the library, just replace the files in /usr/lib/php/cake with the new version!

If you want to go a step further and share some of your own models, views, controllers, behaviors, helpers, or components between applications you can use a similar technique. For example create a folder in ‘/usr/lib/php/models’ and put all your common models in that folder, then in your application open up bootstrap.php and add the following:

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$modelPaths = array(
DS . 'usr' . DS . 'lib' . DS . 'php' . DS . 'models'
);

Like I said the same thing can be done with views, controllers, helpers, behaviors or components. The cookbook says how! This is pretty handy for when you find a bug in a model and you have several applications using that model!