!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
    }
}