Hi to all!

I am trying to add C++ class via Eclipse GUI. The window for adding c++ class is shown correctly. I enter "Sourcer Folder", optional namespace, class name, but when I click "Add" at "Base classes" and I add QWidget as base class, I get error message:
Qt Code: 
  1. Base class 'QWidget' not in include paths for current project.
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Otherwise other features in Eclipse work (reagarding parsing). Where do I setup these include directories?