Organize libs inside folders

Hi!!
How can I use libraries inside folders in my sketch?? I'm working in a big project, and I'll have so many classes. I'm trying to organize it, but it's not working....?

The Arduino IDE cannot find the lib, and Stino shows: collect2: error: ld returned 1 exit status.

Is it possible to use sub-folders in my sketch??

Thanks!!

You can't. The folder contains your sketch as a flat file structure and the library folder is also a flat file structure.

The Arduino IDE isn't designed to cope with large or complex projects. If you're outgrowing the Arduino, there are other development environments available which scale up better.

Ok, thx!!