linux-*:contains(QT_CONFIG, evdev) { HEADERS += $$PWD/qdevicediscovery_p.h contains(QT_CONFIG, libudev) { SOURCES += $$PWD/qdevicediscovery_udev.cpp INCLUDEPATH += $$QMAKE_INCDIR_LIBUDEV LIBS += $$QMAKE_LIBS_LIBUDEV } else { SOURCES += $$PWD/qdevicediscovery_static.cpp } }