How to use linked resource with eclipse CDT ?

Question

I found it very difficult to configure linked resource in Eclipse CDT.

Folder "wspolne" is located somewhere in the system, I'd like to use .cpp .h files from it in my current project, but avoid copying it.
From what I read about Linked Resources is a solution, but I can't build a projct :/

I followed instuctions described here with out any result: What's wrong ?

Image that shows problem:

Answer 1

I am not sure linked folder are adequately indexed by the CDT

A workaround would be, as in this thread:

If you want CDT to manage the builds you need to move the sub-folders into there own project folder and create dependencies between them.