Hi, I have been trying to build Boost 1.31 libaries for Windows 2k3 x64 (AMD64) machines. I am using the Platform SDK 2003 R1, which contains the MS C++ compiler (cl) and linker (link) for AMD64. I have VC6 installed (sp6) side-by-side. This is 32-bit Windows XP system, but I intend to build the libraries for Windows on AMD64. This is possible only with the Platform SDK compiler for AMD64. I downloaded bjam2 for doing the build. Now I am not sure what toolset to use to invoke the appropriate compiler and include / lib paths. I modified the user-config.jam file in the top dir of the boost-build installation: -I uncommented the msvc line and added stuff like this: using msvc : 7.1 : "C:\Program Files\Microsoft Platform SDK\Bin\win64\x86\AMD64\cl.exe"; - I already set the env variables (PATH, LIB, INCLUDE) so that the AMD64 libraries and the platform SDK include paths are used by the compiler. I then ran the following command-line after going into the boost_1_31_0 source directory. I am still getting errors, apparently the wrong compiler is being run and the wrong includes are being used. I have no clue of the bjam syntax and my timelines hardly encourage me to try that too hard now. Any pointers will be of great help. - Arindam