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If it's in the subdirectory qwt-qt4 you either need to add that to your include_path via CMake, or you need to use the full path in you #include "qwt-qt4/qwt_dial.h"

I'm not familiar with the qt CMake infrastructure, but i'd recommend looking at other projects to see which approach they use. I suspect that there is a CMake varialble you should be loading and adding to your include path provided by Qt.