Hi, with the following test program: <code> #include <boost/iostreams/filter/bzip2.hpp> int main(int argc, char* argv[]) { return 0; } </code> I get the linker error (MSVC 7.1): LINK : fatal error LNK1104: cannot open file 'libboost_bzip2-vc71-mt-1_33.lib' A similar error occurs with "zlib.hpp" instead of "bzip2.hpp": LINK : fatal error LNK1104: cannot open file 'libboost_zlib-vc71-mt-1_33.lib' I did not find this lib files in my Boost library directory, so I might have missed something when I built Boost. This is what I did: - Got the sources for the bzip2 and the zlib libraries - Built the libs - Built Boost with this command line: bjam "-sTOOLS=vc-7_1" "-sNO_COMPRESSION=0" "-sNO_ZLIB=0" "-sZLIB_LIBPATH=c:/dev/Libraries/zlib/lib" "-sZLIB_INCLUDE=c:/dev/Libraries/zlib/include/zlib" "-sNO_BZIP2=0" "-sBZIP2_LIBPATH=c:/dev/Libraries/bzip2/lib" "-sBZIP2_INCLUDE=c:/dev/Libraries/bzip2/include/bzip2" (without the line breaks of course) The names of the bzip2 / zlib libraries are libbz2.lib and zdll.lib, resp., and the paths are correct. I did not get any error messages when building Boost, and I also did not get the "Building Boost.Iostream with .. support disabled..." message. Is there anything that I missed from the docs? Best regards, Klaus