#include <GL/glut.h >

void display(void) {
  glClear(GL_COLOR_BUFFER_BIT);
  glColor3f(red, green blue);
  glBegin(GL_POLYGON);
	
   /* describe polygon vertices here */
  
  glEnd();

  glFlush();

}

void init(void)
{
 
  glClearColor( red, green, blue, 0.0);

  /* initialize viewing values */

}

int main( &argc, argv);
{
  glutInit(&argc, argv);
  glutInitDisplayMode9GLUT_SINGLE | GLUT_RGB);
  glutInitWindowSize();
  glutInitwindowPosition();
  glutCreateWindow();
  init();
  glutdisplayFunc(display);
  glutMainLoop();
  return 0; 
}