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For Qt5 the project file needs to add QT += widgets.
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--- dialogbox.pro 2016-03-02 20:31:01.000000000 +0100
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+++ dialogbox.pro 2016-12-27 22:06:17.270398461 +0100
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@@ -1,5 +1,6 @@
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TEMPLATE = app
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TARGET = dialogbox
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+QT += widgets
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DEPENDPATH += .
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INCLUDEPATH += .
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