C:\Users\Serg\Documents\Cloud\filesender.cpp:-1: ошибка: undefined reference to `boost::filesystem::path_traits::convert(char const*, char const*, std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> >&, std::codecvt<wchar_t, char, int> const&)'
LIBS += -lws2_32 -lboost_filesystem-mgw49-mt-1_61 -lboost_system-mgw49-mt-1_61