[Linker error] undefined reference to `Guilds::getGuildIdByName(unsigned int&, std::string const&)'
[Linker error] undefined reference to `Guilds::getGuildById(unsigned int)'
[Linker error] undefined reference to `Guilds::getGuildIdByName(unsigned int&, std::string const&)'
[Linker error] undefined reference to `Guilds::loadWars()'
[Linker error] undefined reference to `Guild::isEnemy(unsigned int) const'
[Linker error] undefined reference to `Guild::isEnemy(unsigned int) const'
[Linker error] undefined reference to `Guild::isEnemy(unsigned int) const'