can anyone help me with this linking error? i havent found any solution

error LNK2001: unresolved external symbol "class _STL::basic_ostream<char,class _STL::char_traits<char> > & __cdecl CEGUI::operator<<(class _STL::basic_ostream<char,class _STL::char_traits<char> > &,class CEGUI::String const
&)" (??6CEGUI@@YAAAV?$basic_ostream@DV?$char_traits@D@_STL@@@_STL@@AAV12@ABVString@0@@Z)
i'm using vc++ 6.0 and the precompiled version of ogre + cegui ...