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Hi, I can't build my project with the Error ' : fatal error: QMainWindow: no file or directory #include <QMainWindow>
Earlier in the morning I just installed QT 5.9.1 and I am working on Ubuntu 17.04
Do you include widgets module in your .pro file?
QT += widgets
yeah but I had to remove all the library and install a new version
So it is working again for you?
