I'm using VC 7.1 with MFC and boost 1.33 serialization. I'm getting these link errors. Any one have this problem? I had more link errors with 1.32 I just didn't use Unicode to get around the link errors. But I'd really really like to have Unicode XML files. Linking... libboost_wserialization-vc71-mt-sgd-1_33.lib(xml_wgrammar.obj) : error LNK2005: _iswdigit already defined in libcmtd.lib(_wctype.obj) libboost_wserialization-vc71-mt-sgd-1_33.lib(xml_wgrammar.obj) : error LNK2005: _iswxdigit already defined in libcmtd.lib(_wctype.obj) libboost_wserialization-vc71-mt-sgd-1_33.lib(basic_text_wiprimitive.obj) : error LNK2005: _iswspace already defined in libcmtd.lib(_wctype.obj) libboost_wserialization-vc71-mt-sgd-1_33.lib(xml_wgrammar.obj) : warning LNK4006: _iswdigit already defined in libcmtd.lib(_wctype.obj); second definition ignored libboost_wserialization-vc71-mt-sgd-1_33.lib(xml_wgrammar.obj) : warning LNK4006: _iswxdigit already defined in libcmtd.lib(_wctype.obj); second definition ignored libboost_wserialization-vc71-mt-sgd-1_33.lib(basic_text_wiprimitive.obj) : warning LNK4006: _iswspace already defined in libcmtd.lib(_wctype.obj); second definition ignored