main.cc:(.text+0x1a8): undefined reference to `web_parser_cache::append[abi:cxx11](web_content_cache)'
/usr/bin/ld: main.cc:(.text+0x200): undefined reference to `web_parser_cache::valid(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'