Can't build Qt 5.4 on MacOS X 10.7

    ../../../include/QtCore/../../src/corelib/kernel/qmetatype.h:1943:1: error: copying variable of type 'QBasicAtomicInt' (aka 'QBasicAtomicInteger<int>') invokes deleted constructor
    Q_DECLARE_METATYPE_TEMPLATE_2ARG(QPair)
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    ../../../include/QtCore/../../src/corelib/kernel/qmetatype.h:1808:32: note: expanded from macro 'Q_DECLARE_METATYPE_TEMPLATE_2ARG'
            static QBasicAtomicInt metatype_id = Q_BASIC_ATOMIC_INITIALIZER(o); \
                                   ^             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    ../../../include/QtCore/../../src/corelib/kernel/qmetatype.h:1509:82: note: in instantiation of member function 'QMetaTypeId<QPair<QVariant, QVariant> >::qt_metatype_id' requested here
        static inline Q_DECL_CONSTEXPR int qt_metatype_id() { return QMetaTypeId<T>::qt_metatype_id(); }
                                                                                     ^
    ../../../include/QtCore/../../src/corelib/thread/qbasicatomic.h:229:5: note: function has been explicitly marked deleted here
        QBasicAtomicInteger(const QBasicAtomicInteger &) = delete;