Recommended approach to combining raw PHP and Codeigniter

I'm building a web app using Codeigniter as my framework of choice. I have a 开发者_开发百科3rd party library that I am using to handle some OpenID authentication. The library is written in raw PHP (I've tried some of the OpenID libraries written for Codeigniter but I couldn't get any of them to really work how I wanted to).

What is the recommended approach for using this raw PHP library alongside my Codeigniter files? The library isn't all that big but I'd much prefer if there is a way I can just plug this library into my Codeigniter app because I am new to Codeigniter and I'd rather spend my time building my application then porting a library from raw PHP to Codeigniter if I don't have to.

Additional info: I have written several applications in raw PHP, but I am new to Codeigniter

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Is the library a class in a single file? The "Codeigniter Way" to handle this is to put it into your application/libraries directory. In CI call $this->load->library('MyLibraryName'); before you use it. (There are also ways to load your library automatically - see application/config/autoload.php)

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include 'wherever/it/is.php';

$foo = new Bar;

Magic! :)