Hi All I found in Sun Solaris machine I have the version 1.40 of boost and not the last one as I thought. and each time I try to use a thread with a shared pointer I receive this message. "/opt/boost/boost/thread/detail/thread.hpp", line 344: Error: boost::thread::thread(boost::thread&) is not accessible from boost::move(boost::detail::thread_move_tboost::thread). 1 Error(s) detected. I am trying to use thread using code like this below boost::shared_ptr< boost::thread > m_ThreadListener( new boost::thread( funct) ); Do you know a solution for this issue? Reading posts it seems that I should rebuild the library.. ..is this correct or there is some workaround? Thanks AFG