This failure: http://tinyurl.com/wlwh2 reads like this: illegal access from 'boost::iostreams::detail::finite_state_filter_impl<identity_fsm>' to protected/private member 'boost::iostreams::detail::finite_state_filter_impl<identity_fsm>::on_any<identity_fsm>(identity_fsm &, char)' It might be a compiler bug, but I'd suppose that enough "friend" declarations should help, and if all fails, the member can be made public just for one compiler. Anybody can look into this? Thanks, Volodya