I'm currently getting a bunch of errors from the serialization library on the Boost trunk on Mac OS X 10.4: darwin.compile.c++ ../../../bin.v2/libs/mpi/build/darwin-4.0.1/debug/ macosx-version-10.4/content_oarchive.o../../../boost/archive/impl/ archive_pointer_oserializer.ipp: In constructor 'boost::archive::detail::archive_pointer_oserializer<Archive>::archive_p ointer_oserializer(const boost::serialization::extended_type_info&)':../../../boost/archive/ impl/archive_pointer_oserializer.ipp:41: error: 'singleton' is not a member of 'boost::serialization'../../../boost/archive/impl/ archive_pointer_oserializer.ipp:43: error: expected primary- expression before '>' token../../../boost/archive/impl/ archive_pointer_oserializer.ipp:43: error: '::get_mutable_instance' has not been declared../../../boost/archive/impl/ archive_pointer_oserializer.ipp: In static member function 'static const boost::archive::detail::basic_pointer_oserializer* boost::archive::detail::archive_pointer_oserializer<Archive>::find (const boost::serialization::extended_type_info&)':../../../boost/ archive/impl/archive_pointer_oserializer.ipp:54: error: 'singleton' is not a member of 'boost::serialization'../../../boost/archive/impl/ archive_pointer_oserializer.ipp:56: error: expected primary- expression before '>' token../../../boost/archive/impl/ archive_pointer_oserializer.ipp:56: error: '::get_const_instance' has not been declared../../../boost/archive/impl/ archive_pointer_oserializer.ipp:57: error: 'singleton' is not a member of 'boost::serialization'../../../boost/archive/impl/ archive_pointer_oserializer.ipp:57: error: '::get_const_instance' has not been declared../../../boost/archive/impl/ archive_pointer_oserializer.ipp:57: error: expected primary- expression before 'void'../../../boost/archive/impl/ archive_pointer_oserializer.ipp:57: error: expected `)' before 'void'../../../boost/archive/impl/archive_pointer_oserializer.ipp:57: error: expected `)' before ';' token../../../boost/archive/impl/ archive_pointer_oserializer.ipp: In destructor 'virtual boost::archive::detail::archive_pointer_oserializer<Archive>::~archive_p ointer_oserializer()':../../../boost/archive/impl/ archive_pointer_oserializer.ipp:73: error: 'singleton' is not a member of 'boost::serialization'../../../boost/archive/impl/ archive_pointer_oserializer.ipp:75: error: expected primary- expression before '>' token../../../boost/archive/impl/ archive_pointer_oserializer.ipp:75: error: '::get_mutable_instance' has not been declared Any idea about what's happening? - Doug