Hi, When I link multiple files that have included zip_iterator.hpp I get the following link error in MSVC 8.0. ...found 16 targets... ...updating 3 targets... msvc.link ..\bin\examples\msvc-8.0\release\test.exe ..\bin\examples\msvc-8.0\release\test.rsp test2.obj : error LNK2005: "bool __cdecl boost::detail::tuple_impl_specific::tuple_equal(struct boost::tuples::null_type,struct boost::tuples::null_type)" (?tuple_equal@tuple_impl_specific@detail@boost@@YA_NUnull_type@tuples@3@0@Z) already defined in test1.obj ..\bin\examples\msvc-8.0\release\test.exe : fatal error LNK1169: one or more multiply defined symbols found call "C:\Program Files\Microsoft Visual Studio 8\VC\bin\vcvars32.bat" > nul link /NOLOGO /subsystem:console /out:"..\bin\examples\msvc-8.0\release\test.exe" /INCREMENTAL:NO @"..\bin\examples\msvc-8.0\release\test.rsp" ...failed msvc.link ..\bin\examples\msvc-8.0\release\test.exe ..\bin\examples\msvc-8.0\release\test.rsp... ...removing ..\bin\examples\msvc-8.0\release\test.rsp ...failed updating 2 targets... ...updated 1 target... I have attached the two files I am compiling and my Jamfile. Thanks, Chris