I have a problem when I include kwindowsystem.h file into a new project, The message error says "No such file or directory". I am using Kubuntu 10.10 and developing on QtCreator 2.1.0. I think that the problem is because I have to install some kde library and add it to my Makefile, but I don't know which library is and neither how to add it to my Makefile.

Please somebody help me with this problem

Thanks very much