Get errors with running example.

[Meolax]

/tmp/ccuGj3Z9.o: In function main': kw.cpp:(.text+0x5d): undefined reference to bprinter::TablePrinter::TablePrinter(std::ostream*, std::__cxx11::basic_string<char, std::char_traits, std::allocator > const&)' kw.cpp:(.text+0xc2): undefined reference to bprinter::TablePrinter::AddColumn(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)' kw.cpp:(.text+0x127): undefined reference to bprinter::TablePrinter::AddColumn(std::__cxx11::basic_string<char, std::char_traits, std::allocator > const&, int)' kw.cpp:(.text+0x18c): undefined reference to bprinter::TablePrinter::AddColumn(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)' kw.cpp:(.text+0x1f1): undefined reference to bprinter::TablePrinter::AddColumn(std::__cxx11::basic_string<char, std::char_traits, std::allocator > const&, int)' kw.cpp:(.text+0x21b): undefined reference to bprinter::TablePrinter::PrintHeader()' kw.cpp:(.text+0x26b): undefined reference to bprinter::TablePrinter::operator<<(double)' kw.cpp:(.text+0x2bb): undefined reference to bprinter::TablePrinter::operator<<(double)' kw.cpp:(.text+0x347): undefined reference to bprinter::TablePrinter::operator<<(double)' kw.cpp:(.text+0x397): undefined reference to bprinter::TablePrinter::operator<<(double)' kw.cpp:(.text+0x45f): undefined reference to bprinter::TablePrinter::operator<<(double)' /tmp/ccuGj3Z9.o:kw.cpp:(.text+0x50f): more undefined references to bprinter::TablePrinter::operator<<(double)' follow /tmp/ccuGj3Z9.o: In function main': kw.cpp:(.text+0x51b): undefined reference to bprinter::TablePrinter::PrintFooter()' kw.cpp:(.text+0x527): undefined reference to bprinter::TablePrinter::~TablePrinter()' kw.cpp:(.text+0x624): undefined reference to bprinter::TablePrinter::~TablePrinter()' /tmp/ccuGj3Z9.o: In function bprinter::TablePrinter& bprinter::TablePrinter::operator<< <char const*>(char const*)': kw.cpp:(.text.ZN8bprinter12TablePrinterlsIPKcEERS0_T[ZN8bprinter12TablePrinterlsIPKcEERS0_T]+0xc3): undefined reference to bprinter::TablePrinter::get_num_columns() const' /tmp/ccuGj3Z9.o: In function bprinter::TablePrinter& bprinter::TablePrinter::operator<< (int)': kw.cpp:(.text.ZN8bprinter12TablePrinterlsIiEERS0_T[ZN8bprinter12TablePrinterlsIiEERS0_T]+0xc0): undefined reference to `bprinter::TablePrinter::get_num_columns() const' collect2: error: ld returned 1 exit status kw.txt