Hello, I've searched in both stlport and boost forums, but I couldn't find anything yet about my problem. I'm using boost 1.33, and I tried to compiled with STL port. Boost compiles fine (except boost python, but I'll have a look later) and when I link my program, I have the following errors : boost.lib(w32_regex_traits.obj) : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall stlp_std::basic_string<unsigned short,class stlp_std::char_traits<unsigned short>,class stlp_std::allocator<unsigned short> >::basic_string<unsigned short,class stlp_std::char_traits<unsigned short>,class stlp_std::allocator<unsigned short> >(unsigned short const *,class stlp_std::allocator<unsigned short> const &)" Do you have an idea of what could be the problem, and how to solve it ? I tried with STLport 4.6.2, 5.0.2 and 5.1, and I have the same error. Thanks, Gérald