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I'm getting the following error message when building a project (KDiff3) in Qt Creator for Windows, any help would be appreciated.

C:\kdiff3\src-QT4\kreplacements\kreplacements.h:27: error: QMainWindow: No such file or directory #include < QMainWindow>

mparkuk
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1 Answers1

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When updating a QT project from QT4 to QT5 if you see the above error, you will need to edit your .pro file to include:

QT += widgets

Transition from Qt 4.x to Qt5

mparkuk
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