Add source code as a library in Xcode4

I've got 开发者_高级运维some source code (.h and .m files) that being developed by someone else.

I need to add it to my project as a (static) library Or even to add it as a source files that to be used by my own source files..

When I copy and past the folder containing the .m and .h files into my project I got a link error.

How to do that?

Maybe this tutorial will help you:

Using static libraries with Xcode