puzzle.pro Example File
draganddrop/puzzle/puzzle.pro
  QT += widgets
  requires(qtConfig(filedialog))
  HEADERS     = mainwindow.h \
                pieceslist.h \
                puzzlewidget.h
  RESOURCES   = puzzle.qrc
  SOURCES     = main.cpp \
                mainwindow.cpp \
                pieceslist.cpp \
                puzzlewidget.cpp
  QMAKE_PROJECT_NAME = dndpuzzle
  # install
  target.path = $$[QT_INSTALL_EXAMPLES]/widgets/draganddrop/puzzle
  INSTALLS += target