#include <GL/gl.h>

main() {

//	InitializeAWindowPlease();

	glClearColor (0.0, 0.0, 0.0, 0.0);
	glClear (GL_COLOR_BUFFER_BIT);
	glColor3f (1.0, 1.0, 1.0);
	glOrtho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);
	glBegin(GL_POLYGON);
	glVertex3f (0.25, 0.25, 0.0);
	glVertex3f (0.75, 0.25, 0.0);
	glVertex3f (0.75, 0.75, 0.0);
	glVertex3f (0.25, 0.75, 0.0);
	glEnd();
	glFlush();

//	UpdateTheWindowAndCheckForEvents();
}