[Boost-users] autolink include guard ?

I notice that when my tests build I get Linking to lib file: libboost_serialization-vc71-mt-gd-1_35.lib Linking to lib file: libboost_serialization-vc71-mt-gd-1_35.lib I was curious as to why I go two such messages. Looking at auto_link.hpp I see that there is no include guard no a #pragma once. Is there a reason for this? Robert Ramey