C++ Изучаю наследование классов.

daemon.hpp:

class TDaemon{
	protected:
		static char ConfigFileName[128];
	public:
		TDaemon(const char* ConfigName);
		~TDaemon(){ };
                virtual void DaemonFunction(unsigned int, void*);
};

usb_daemon.hpp:

class TUSB_Daemon : public TDaemon{
	private:
		
	public:
		void DaemonFunction(unsigned int, void*);
		TUSB_Daemon(const char* ConfigName) : TDaemon(ConfigName){};
};

usb_daemon.o:(.rodata._ZTI11TUSB_Daemon[_ZTI11TUSB_Daemon]+0x10): undefined reference to `typeinfo for TDaemon'
daemon.o: In function `TDaemon::TDaemon(char const*)':
/home/igor/templates/daemon/src/daemon.cpp:235: undefined reference to `vtable for TDaemon'
main.o: In function `TDaemon::~TDaemon()':
/home/igor/templates/daemon/src/daemon.hpp:35: undefined reference to `vtable for TDaemon'
collect2: error: ld returned 1 exit status