strict_c++|isEmpty(QMAKE_CXXFLAGS_GNUCXX11) {
    QMAKE_CXXFLAGS += $$QMAKE_CXXFLAGS_CXX11
    QMAKE_OBJECTIVE_CFLAGS += $$QMAKE_CXXFLAGS_CXX11
    QMAKE_LFLAGS += $$QMAKE_LFLAGS_CXX11
} else {
    QMAKE_CXXFLAGS += $$QMAKE_CXXFLAGS_GNUCXX11
    QMAKE_OBJECTIVE_CFLAGS += $$QMAKE_CXXFLAGS_GNUCXX11
    QMAKE_LFLAGS += $$QMAKE_LFLAGS_GNUCXX11
}