error linker messages.

ok i think i might have finally set up my devc++ compiler to run openGL files and i am using a openGL tutorial from the gametutorial.com website and its says to include the following headers:

#include <stdio.h>
#include <stdlib.h>
#include <gl/gl.h>
#include <gl/glu.h>
#include <gl/glut.h>

amd these are the only error messages i get and they have nothing to do with header files so what do the following error messages mean:

[Linker error] undefined reference to `__glutInitWithExit@12’

[Linker error] undefined reference to `__glutCreateWindowWithExit@8’

[Linker error] undefined reference to `__glutCreateMenuWithExit@8’

#define GLUT_ATEXIT_HACK

What do you have in your linker line?