!isEmpty(QMAKE_MAC_SDK) {

    !macx-xcode:!macx-pbuilder {

        QMAKE_CFLAGS += -isysroot $$QMAKE_MAC_SDK

        QMAKE_OBJECTIVE_CFLAGS += -isysroot $$QMAKE_MAC_SDK

        QMAKE_CXXFLAGS += -isysroot $$QMAKE_MAC_SDK

        QMAKE_LFLAGS += -Wl,-syslibroot,$$QMAKE_MAC_SDK

    }

}