Hello, when compiling one of my projects which uses Boost.Format I get the compiler warning shown below. I have defined both _CRT_SECURE_NO_DEPRECATE & _CRT_NONSTDC_NO_DEPRECATE as suggested by various web pages. With these the vast majority of warnings go away but this pesky one attached here is still there. Would people know if there is anything else I can do to get rid of this warning? Thanks very much, kind regards Eoin. Error given by vc 8.0 C:\Develop\Libraries\Boost\boost_cvs\boost/format/alt_sstream_impl.hpp(252) : warning C4996: 'std::char_traits<char>::copy' was declared deprecated C:\Program Files\Microsoft Visual Studio 8\VC\INCLUDE\iosfwd(446) : see declaration of 'std::char_traits<char>::copy' Message: 'You have used a std:: construct that is not safe. See documentation on how to use the Safe Standard C++ Library' C:\Develop\Libraries\Boost\boost_cvs\boost/format/alt_sstream_impl.hpp(223) : while compiling class template member function 'int boost::io::basic_altstringbuf<Ch,Tr,Alloc>::overflow(int)' with [ Ch=char, Tr=std::char_traits<char>, Alloc=std::allocator<char> ] C:\Develop\Libraries\Boost\boost_cvs\boost/format/format_class.hpp(136) : see reference to class template instantiation 'boost::io::basic_altstringbuf<Ch,Tr,Alloc>' being compiled with [ Ch=char, Tr=std::char_traits<char>, Alloc=std::allocator<char> ] C:\Develop\Apps\Http\Http\src\server_connection.cpp(61) : see reference to class template instantiation 'boost::basic_format<Ch>' being compiled with [ Ch=char ]