HEADERS += $$PWD/qdevicediscovery_p.h contains(QT_CONFIG, libudev) { SOURCES += $$PWD/qdevicediscovery_udev.cpp HEADERS += $$PWD/qdevicediscovery_udev_p.h INCLUDEPATH += $$QMAKE_INCDIR_LIBUDEV LIBS_PRIVATE += $$QMAKE_LIBS_LIBUDEV } else: contains(QT_CONFIG, evdev) { SOURCES += $$PWD/qdevicediscovery_static.cpp HEADERS += $$PWD/qdevicediscovery_static_p.h } else { SOURCES += $$PWD/qdevicediscovery_dummy.cpp HEADERS += $$PWD/qdevicediscovery_dummy_p.h }