QT += serialbus widgets requires(qtConfig(combobox)) qtConfig(modbus-serialport): QT += serialport TARGET = modbusslave TEMPLATE = app CONFIG += c++11 SOURCES += \ main.cpp \ mainwindow.cpp \ settingsdialog.cpp HEADERS += \ mainwindow.h \ settingsdialog.h FORMS += \ mainwindow.ui \ settingsdialog.ui RESOURCES += slave.qrc target.path = $$[QT_INSTALL_EXAMPLES]/serialbus/modbus/slave INSTALLS += target