application.pro Example File

mainwindows/application/application.pro
 QT += widgets
 requires(qtConfig(filedialog))

 HEADERS       = mainwindow.h
 SOURCES       = main.cpp \
                 mainwindow.cpp
 RESOURCES     = application.qrc

 # install
 target.path = $$[QT_INSTALL_EXAMPLES]/widgets/mainwindows/application
 INSTALLS += target