I downloaded Boost 1.35 Head from SVN. I built it with the command: bjam --toolset=msvc-7.1 --NO_ZLIB=0 -sZLIB_SOURCE=C:/Qt/3.3.8/src/3rdparty/zlib install Then I tried to rebuild our app. I got the linking error: LINK : fatal error LNK1104: cannot open file 'libboost_serialization-vc71-mt-1_35.lib' The folder C:/Boost/lib does not contain the file libboost_serialization-vc71-mt-1_35.lib. It seems it was not built. The folder contains boost_serialization-vc71-mt-1_35.dll boost_serialization-vc71-mt-1_35.lib boost_serialization-vc71-mt.lib but no other xxx_serialization_yyy libs. The same happens with the other Boost libs, not just with the serialization lib. Does anyone have any idea what the problem might be, or what additional information I should provide? Thank you, Johan Råde