Hi, Attempts to build 32-bits target libraries/dll of Boost.Python with MSVC running under Windows 7 x64 ends with errors. The 6 *.lib & *.dll of the form boost_python-vc*-mt* are not built. No problems is experienced if MSVC is running under 32-bits version of Windows (XP Pro SP3 & 7 Ultimate tested), or the target is 64-bits libraries even when running under Win7 x64. The below (sample) errors was produced with Windows 7 Ultimate x64, Visual Studio (2008 Pro & 2010 Ultimate tested), and ActiveState ActivePython (2.6 & 2.7 tested). msvc.link.dll x86\boost\bin.v2\libs\python\build\msvc-10.0\debug\threading-multi\boost_python-vc100-mt-gd-1_44.dll Creating library x86\boost\bin.v2\libs\python\build\msvc-10.0\debug\threading-multi\boost_python-vc100-mt-gd-1_44.lib and object x86\boost\bin.v2\libs\python\build\msvc-10.0\debug\threading-multi\boost_python-vc100-mt-gd-1_44.exp function.obj : error LNK2001: unresolved external symbol __imp__PyErr_Format numeric.obj : error LNK2019: unresolved external symbol __imp__PyErr_Format referenced in function "void __cdecl boost::python::numeric::`anonymous namespace'::throw_load_failure(void)" (?throw_load_failure@?A0x9a30ad83@numeric@python@boost@@YAXXZ) from_python.obj : error LNK2001: unresolved external symbol __imp__PyErr_Format registry.obj : error LNK2001: unresolved external symbol __imp__PyErr_Format class.obj : error LNK2001: unresolved external symbol __imp__PyErr_Format numeric.obj : error LNK2001: unresolved external symbol __imp__PyExc_ImportError numeric.obj : error LNK2019: unresolved external symbol __imp__PyErr_Clear referenced in function "bool __cdecl boost::python::numeric::`anonymous namespace'::load(bool)" (?load@?A0x9a30ad83@numeric@python@boost@@YA_N_N@Z) class.obj : error LNK2001: unresolved external symbol __imp__PyErr_Clear <snip> (Full log can be view at <http://pastebin.com/b62UaEJV>.) Any ideas of a workaround or fix? Regards, KTC