BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_void<foo4_t>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_void<incomplete_type>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_void<int&>::value, false);
-#ifndef BOOST_NO_RVALUE_REFERENCES
+#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_void<int&&>::value, false);
#endif