C++ 不命名类型错误

我似乎无法指出这个问题，所以我想我会在这里问。我知道为什么通常会出现此错误，但这次我似乎无法弄清楚。可能是我不知道或缺少的简单东西。

g++  -c -I/usr/include/SDL -D_GNU_SOURCE=1 -D_REENTRANT src/Render.cpp -L/usr/lib/i386-linux-gnu -lSDL -lSDL_image
src/Render.cpp:8:1: error: ‘Render’ does not name a type
src/Render.cpp:13:1: error: ‘Render’ does not name a type
src/Render.cpp:18:14: error: ‘Render’ has not been declared
src/Render.cpp:31:6: error: ‘Render’ has not been declared
make: *** [Render.o] Error 1

这是我的核心.cpp，Makefile和Render.h

渲染.cpp

#ifndef _Render_h
#define _Render_h
#include <iostream>
#include "SDL/SDL_image.h"
using namespace std;
Render::Render()
{
}
Render::~Render()
{
}
SDL_Surface* Render::loadImg(string filename)
{
    SDL_Surface* temp = NULL;
    SDL_Surface* optimized = NULL;
    if((temp = IMG_Load(filename.c_str())) != NULL)
    {
        optimized = SDL_DisplayFormat(temp);
        SDL_FreeSurface(temp);
    }
    return optimized;
}
void Render::applySurface(int x, int y, SDL_Surface* source,
        SDL_Surface* destination)
{
    SDL_Rect offset;
    offset.x = x;
    offset.y = y;
    SDL_BlitSurface(source, NULL, destination, &offset);    
}
#endif

核心.cpp

#include <iostream>
#include "SDL/SDL.h"
#include "Render.h"
using namespace std;
int main(int argc, char* args[])
{
    string imgGoku = "src/imgs/Goku.bmp";
    string imgVegeta = "src/imgs/Vegeta.png";
    const int SCREEN_WIDTH = 640;
    const int SCREEN_HEIGHT = 480;
    const int SCREEN_BPP = 32;
    SDL_Surface *message = NULL;
    SDL_Surface *background = NULL;
    SDL_Surface *screen = NULL;
    Render rnd;
    if(SDL_Init(SDL_INIT_EVERYTHING) == -1)
    {
        return 1;
    }
    screen = SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT,
            SCREEN_BPP, SDL_SWSURFACE);
    if(screen == NULL)
    {
        return 1;
    }
    SDL_WM_SetCaption("Hello World", NULL);
    rnd.applySurface(10,10,rnd.loadImg(imgGoku),screen);
    if(SDL_Flip(screen) == -1)
    {
        return 1;
    }
    SDL_Delay(2000);
    SDL_FreeSurface(message);
    SDL_FreeSurface(background);
    SDL_Quit();
    return 0;
}

渲染.h

#include "SDL/SDL.h"
using namespace std;
class Render{
    public:
        Render();
        ~Render();
        SDL_Surface* loadImg(string filename);
        void applySurface(int x, int y, 
                SDL_Surface* source, 
                SDL_Surface* destination);
};

生成文件

#Game Make file
TARGET = game.exe
OBJS = core.o 
       Render.o 
SDL_CFLAGS := $(shell sdl-config --cflags)
SDL_LDFLAGS := $(shell sdl-config --libs) -lSDL_image
CFLAGS = -Wall
LIBS =
LDFLAGS = 
$(TARGET): $(OBJS)
       g++ $(CFLAGS) $(SDL_CFLAGS) -o $@  $(LDFLAGS) $(OBJS) $(SDL_LDFLAGS) $(LIBS)
%.o: src/%.cpp src/Render.h
       g++  -c $(SDL_CFLAGS) $< $(SDL_LDFLAGS)
.PHONY: clean
clean:
    rm -f $(TARGET) $(OBJS)