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Tengo problemas con la referencia de las clases, si alguien me puede sacar de mi ignorancia seria de agradecer, estoy trabajando en DEV C++

graphics.h
 

#ifndef GRAPHICS_H
#define GRAPHICS_H
 
struct SDL_Window;
struct SDL_Renderer;
 
class Graphics {
public:
	Graphics();
	~Graphics(); 
private:
	SDL_Window* _window;
	SDL_Renderer* _renderer;
};
 
#endif

Graphics.cpp

#include "../SDL/SDL.h" 
#include "graphics.h" 
 
Graphics::Graphics() {
	SDL_CreateWindowAndRenderer(640, 480, 0, &this->_window, &this->_renderer);
	SDL_SetWindowTitle(this->_window, "algo");
}
 
Graphics::~Graphics(){ 
	SDL_DestroyWindow(this->_window);
}
 

main.cpp

#include "headers/graphics.h"
 
int main(int argc, const char* argv[])
{
	Graphics graphics; 
	while (true)
	{
 
	}
 
	return 0;
}

(http://img259.imagevenue.com/aAfkjfp01fo1i-2088/loc33/074229626_error1_122_33lo.jpg)

(http://img258.imagevenue.com/aAfkjfp01fo1i-7017/loc506/507404538_error2_122_506lo.jpg)