Qt 5.7Qt WidgetsTraffic Light Exampletrafficlight.pro Example File
Qt 5.7.1 Reference Documentation

trafficlight.pro Example File

statemachine/trafficlight/trafficlight.pro 

  QT += widgets

  SOURCES = main.cpp

  # install
  target.path = $$[QT_INSTALL_EXAMPLES]/widgets/statemachine/trafficlight
  INSTALLS += target

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