I have just started using the Boost libraries in VC++.NET - Please bear with me if this seems too simple. I am having trouble compiling this simple class library. //------------------------------------------------- #include "boost/date_time/gregorian/gregorian.hpp" #include "boost/date_time/date_parsing.hpp" namespace First { typedef boost::gregorian::date customDate; } //------------------------------------------------- I get the error message: "cannot open file 'libboost_date_time-vc71-mt-sgd-1_31.lib' " I saw the note by John Maddock and I tried to include this code at the start of the file but it did not help. // // Automatically link to the correct build variant where possible. // #if !defined(BOOST_ALL_NO_LIB) && !defined(BOOST_WHATEVER_NO_LIB) && !defined(BOOST_WHATEVER_SOURCE) // // Set the name of our library, this will get undef'ed by auto_link.hpp // once it's done with it: // #define BOOST_LIB_NAME boost_whatever // // If we're importing code from a dll, then tell auto_link.hpp about it: // #if defined(BOOST_ALL_DYN_LINK) || defined(BOOST_WHATEVER_DYN_LINK) # define BOOST_DYN_LINK #endif // // And include the header that does the work: // #include <boost/config/auto_link.hpp> #endif // auto-linking disabled Clearly I am missing something (maybe quite simple.) I appreciate any help in this matter. Thanks Chris