When I include boost/interprocess/managed_external_buffer.hpp in more than one file within a solution (MSVC 7.1) I get linker errors LNK2005 and LNK4006 because of boost::interprocess::fill_system_message(...) function redefinition. The same is applicable to the case when this header file is included in stdafx.h only. fill_system_message(...) is a standalone function, not a member of a class. And the body of it is included in header file. May it be the point the problem originates from? Maybe the better way is to move "fill_system_message(...)" to .cpp source file? Have anybody faced this problem? Thanks, Alex.