Hi ! When compiling Boost with address-model=64, some libraries issue msvc-warning BOOST_ROOT\boost/config/abi_prefix.hpp(19) : warning C4103: 'BOOST_ROOT\boost\config\abi_prefix.hpp' : alignment changed after including header, may be due to missing #pragma pack(pop) See msvc_9_4103.txt for a full dump using bjam -a -q address-mode=64 -WX Those libraries are: - system - filesystem - serialization - wave Please find the necessary patches attached. Additionaly, I've added _SCL_SECURE_NO_WARNINGS to serialization and changed wave to always set _SCL_SECURE_NO_DEPRECATE and _CRT_SECURE_NO_DEPRECATE regardless of the compiler version. This should silence those warning for the msvc incarnation, too. Okay to commit ? Comments ? Yours, Jürgen -- * Dipl.-Math. Jürgen Hunold ! Ingenieurgesellschaft für * voice: ++49 511 262926 57 ! Verkehrs- und Eisenbahnwesen mbH * fax : ++49 511 262926 99 ! Lister Straße 15 * juergen.hunold@ivembh.de ! www.ivembh.de * * Geschäftsführer: ! Sitz des Unternehmens: Hannover * Prof. Dr.-Ing. Thomas Siefer ! Amtsgericht Hannover, HRB 56965 * PD Dr.-Ing. Alfons Radtke !