It appears the following were missing #ifdef __cplusplus extern "C" { #endif some were also missing #include guards; I didn't check all headers for missing #include guards, just the ones without extern "C" support. CStringIO.h descrobject.h iterobject.h I uploaded a patch to address the problem. +---------------------------------------------------------------+ David Abrahams C++ Booster (http://www.boost.org) O__ == Pythonista (http://www.python.org) c/ /'_ == resume: http://users.rcn.com/abrahams/resume.html (*) \(*) == email: david.abrahams@rcn.com +---------------------------------------------------------------+