Simplest OpenGL Program ever

test.cpp

#include <GL/glut.h>

void draw(void)
{
        glClearColor(0,1,0,1);
        glClear(GL_COLOR_BUFFER_BIT );
        glFlush();
}

int main(int argc, char **argv)
{
        glutInit(&argc, argv);
        glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB );
        glutInitWindowPosition(50,25);
        glutInitWindowSize(500,250);
        glutCreateWindow("Green window");
        glutDisplayFunc(draw);
        glutMainLoop();
        return 0;
}