I've just updated my Boost tree, and now get this: /space/NM/boost/boost/serialization/type_info_implementation.hpp:48: error: incomplete type `boost::STATIC_ASSERTION_FAILURE<false>' does not have member `value' The check in type_info_implementation.hpp was introduced in revision 1.4 of that file. I should also note that log message is "invoke auto-link only when necessary", which is clearly not accurate, given that the STATIC_ASSERT does not have anything to do with auto-linking. There's no comment why the STATIC_ASSERTION is there. So, what's that? If I add #include <boost/serialization/extended_type_info_typeid_fwd.hpp> to the top of the file (to grab definition of BOOST_SERIALIZATION_DEFAULT_TYPE_INFO), things start to look better, but I get: /space/NM/boost/boost/archive/detail/iserializer.hpp:113: error: incomplete type 'boost::serialization::extended_type_info_typeid<const boost::scoped_ptr<lvk::nm_model::runtime::BlockFormula::data> >' cannot be used to name a scope When I change the include to be: #include <boost/serialization/extended_type_info_typeid.hpp> I get this: /space/NM/boost/boost/archive/basic_archive.hpp:21:2: #error "no serialization headers my precede anyarchive headers" I don't understand this error. What if I have a header file MyClass.hpp that declares a serialize function. So, I might need to include <serialization/base_object.hpp>. I need to do that in the header, I believe. Now if I include archive headers in a .cpp file, will that trigger an error? Or the above rule has some exceptions? Ok, now to base_object.hpp. I get: /space/NM/boost/boost/serialization/base_object.hpp:75: error: parse error before `;' token because the header uses 'type_info_implementation' without including the appropriate header. So, to summarize: 1. Could the type_info_implementation.hpp header be fixed either by including #include <boost/serialization/extended_type_info_typeid.hpp> or in some other way. 2. Could base_object.hpp be fixed either by including the appropriate header, or in some other way. 3. What are the exact rules about relative order of serialization/ and archive/ includes? - Volodya