I can't get the tgui-builder to link. It's related to strings.
Undefined references to sf::String::operator std:__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >() const
Undefined references to sf::String::operator std:__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >() const