"Class 'Recurly_Client' not found" after the recurly.php __DIR__ change

[SinusPi]

Describe the bug

Class 'Recurly_Client' not found. And unless just plain strings in the recurly.php file work as require_once calls, it seems quite obvious what went wrong, The file used to require_once all the library files, and now it contains just plain, __DIR__-magicked, file names.

To Reproduce

Using the commit 97f093b:

require_once('recurly-client-php/lib/recurly.php');
Recurly_Client::$subdomain = "foo";