Hello *, is someone aware how to set cutom structure member alignment for boost libs (DLLs) being compiled. We used ...\boost\config\abi\msvc_prefix.hpp #pragma pack(push,4) ...\boost\config\abi\msvc_suffix.hpp #pragma pack(pop) Either these files are not included by boost libs during the build process, or we have to enable their inclusion. Where to do it is unclear. Maybe we can set the correct flag in some .jam file at all. Any help would be greatly appreciated. Many thanks, Ovanes P.S. We are using Microsoft Visual Studio 2003 with boost 1.34.0 distribution.