#if !defined(Linux)
  #include <windows.h>           //Not Linux must be windows
#endif
#include <GL/gl.h>
#include <GL/glut.h>


void crisscross(void) {

    glClear(GL_COLOR_BUFFER_BIT);
    glBegin(GL_LINES);
	glVertex2i(50, 50);
	glVertex2i(350, 350);
	glVertex2i(50, 350);
	glVertex2i(350, 50);
    glEnd();
    glFlush();
}

main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitWindowSize(400,400);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
    glutCreateWindow("Glut Crisscross");

    glutDisplayFunc(crisscross);

    glClearColor(1.0, 1.0, 1.0, 1.0);
    glColor3f(1.0, 0.0, 0.0);
    glMatrixMode(GL_PROJECTION);
    glOrtho(0.0, 400.0, 0.0, 400.0, 0.0, 1.0); 

    glutMainLoop();
}