Hi, I'm developing an ATL library to wrap another LIB with VC6. The includes comprehends: #include <boost/asio.hpp> #include <boost/asio/serial_port.hpp> #include <boost/thread.hpp> #include <boost/signals2/signal.hpp> #include <boost/scoped_ptr.hpp> #include <boost/enable_shared_from_this.hpp> When I compile I get these errors: --------------------------------------------------------------- g:\lib\boost_1_38_0\boost\system\error_code.hpp(45) : error C2252: 'value' : pure specifier can only be specified for functions g:\lib\boost_1_38_0\boost\system\error_code.hpp(45) : see reference to class template instantiation 'boost::system::is_error_code_enum<T>' being compiled g:\lib\boost_1_38_0\boost\system\error_code.hpp(48) : error C2252: 'value' : pure specifier can only be specified for functions g:\lib\boost_1_38_0\boost\system\error_code.hpp(48) : see reference to class template instantiation 'boost::system::is_error_condition_enum<T>' being compiled g:\lib\boost_1_38_0\boost\system\error_code.hpp(145) : error C2258: illegal pure syntax, must be '= 0' g:\lib\boost_1_38_0\boost\system\error_code.hpp(145) : error C2252: 'value' : pure specifier can only be specified for functions g:\lib\boost_1_38_0\boost\system\error_code.hpp(230) : error C2039: 'type' : is not a member of 'enable_if<struct boost::system::is_error_condition_enum<Cond>,void>' g:\lib\boost_1_38_0\boost\system\error_code.hpp(244) : error C2039: 'type' : is not a member of 'enable_if<struct boost::system::is_error_condition_enum<Cond>,class boost::system::error_condition>' g:\lib\boost_1_38_0\boost\system\error_code.hpp(297) : error C2784: 'struct boost::type &__thiscall boost::system::error_condition::operator =(ErrorConditionEnum)' : could not deduce template argument for 'struct boost::type &' from 'class boost::sy stem::error_condition &' g:\lib\boost_1_38_0\boost\system\error_code.hpp(297) : error C2785: 'struct boost::type &__thiscall boost::system::error_condition::operator =(ErrorConditionEnum)' and 'class boost::system::error_condition &__thiscall boost::system::error_condition: :operator =(const class boost::system::error_condition &)' have different return types g:\lib\boost_1_38_0\boost\system\error_code.hpp(245) : see declaration of '=' g:\lib\boost_1_38_0\boost\system\error_code.hpp(317) : error C2039: 'type' : is not a member of 'enable_if<struct boost::system::is_error_code_enum<Cond>,void>' g:\lib\boost_1_38_0\boost\system\error_code.hpp(330) : error C2039: 'type' : is not a member of 'enable_if<struct boost::system::is_error_code_enum<Cond>,class boost::system::error_code>' g:\lib\boost_1_38_0\boost\system\error_code.hpp(384) : error C2784: 'struct boost::type &__thiscall boost::system::error_code::operator =(ErrorCodeEnum)' : could not deduce template argument for 'struct boost::type &' from 'class boost::system::erro r_code &' g:\lib\boost_1_38_0\boost\system\error_code.hpp(384) : error C2785: 'struct boost::type &__thiscall boost::system::error_code::operator =(ErrorCodeEnum)' and 'class boost::system::error_code &__thiscall boost::system::error_code::operator =(const cl ass boost::system::error_code &)' have different return types g:\lib\boost_1_38_0\boost\system\error_code.hpp(331) : see declaration of '=' g:\lib\boost_1_38_0\boost\system\error_code.hpp(395) : error C2143: syntax error : missing ';' before '}' g:\lib\boost_1_38_0\boost\system\error_code.hpp(401) : error C2143: syntax error : missing ';' before '}' g:\lib\boost_1_38_0\boost\system\error_code.hpp(451) : fatal error C1903: unable to recover from previous error(s); stopping compilation --------------------------------------------------------------- Could someone give me some feedback? I need VC6 because its the only environment I can use to develop an ATL project! Thanks in advance! Daniele.