GLUT: Fatal Error in lesson1: visual with necessary capabilities not found. 

//// This code was created by Jeff Molofee '99 (ported to Linux/GLUT by Richard Campbell '99)//// If you've found this code useful, please let me know.//// Visit me at www.demonews.com/hosted/nehe// (email Richard Campbell at ulmont@bellsouth.net)//#include <GL/glut.h>    // Header File For The GLUT Library#include <GL/gl.h>	// Header File For The OpenGL32 Library#include <GL/glu.h>	// Header File For The GLu32 Library#include <unistd.h>     // Header file for sleeping./* ascii code for the escape key */#define ESCAPE 27/* The number of our GLUT window */int window;/* A general OpenGL initialization function.  Sets all of the initial parameters. */void InitGL(int Width, int Height)	        // We call this right after our OpenGL window is created.{  glClearColor(0.0f, 0.0f, 0.0f, 0.0f);		// This Will Clear The Background Color To Black  glClearDepth(1.0);				// Enables Clearing Of The Depth Buffer  glDepthFunc(GL_LESS);				// The Type Of Depth Test To Do  glEnable(GL_DEPTH_TEST);			// Enables Depth Testing  glShadeModel(GL_SMOOTH);			// Enables Smooth Color Shading  glMatrixMode(GL_PROJECTION);  glLoadIdentity();				// Reset The Projection Matrix  gluPerspective(45.0f,(GLfloat)Width/(GLfloat)Height,0.1f,100.0f);	// Calculate The Aspect Ratio Of The Window  glMatrixMode(GL_MODELVIEW);}/* The function called when our window is resized (which shouldn't happen, because we're fullscreen) */void ReSizeGLScene(int Width, int Height){  if (Height==0)				// Prevent A Divide By Zero If The Window Is Too Small    Height=1;  glViewport(0, 0, Width, Height);		// Reset The Current Viewport And Perspective Transformation  glMatrixMode(GL_PROJECTION);  glLoadIdentity();  gluPerspective(45.0f,(GLfloat)Width/(GLfloat)Height,0.1f,100.0f);  glMatrixMode(GL_MODELVIEW);}/* The main drawing function. */void DrawGLScene(){  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);		// Clear The Screen And The Depth Buffer  glLoadIdentity();				// Reset The View  // since this is double buffered, swap the buffers to display what just got drawn.  glutSwapBuffers();}/* The function called whenever a key is pressed. */void keyPressed(unsigned char key, int x, int y){    /* avoid thrashing this procedure */    usleep(100);    /* If escape is pressed, kill everything. */    if (key == ESCAPE)    { 	/* shut down our window */	glutDestroyWindow(window); 	/* exit the program...normal termination. */	exit(0);    }}int main(int argc, char **argv){  /* Initialize GLUT state - glut will take any command line arguments that pertain to it or     X Windows - look at its documentation at http://reality.sgi.com/mjk/spec3/spec3.html */  glutInit(&argc, argv);  /* Select type of Display mode:        Double buffer     RGBA color     Alpha components supported     Depth buffer */  glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_ALPHA | GLUT_DEPTH);  /* get a 640 x 480 window */  glutInitWindowSize(640, 480);  /* the window starts at the upper left corner of the screen */  glutInitWindowPosition(0, 0);  /* Open a window */  window = glutCreateWindow("Jeff Molofee's GL Code Tutorial ... NeHe '99");  /* Register the function to do all our OpenGL drawing. */  glutDisplayFunc(&DrawGLScene);    /* Go fullscreen.  This is as soon as possible. */  glutFullScreen();  /* Even if there are no events, redraw our gl scene. */  glutIdleFunc(&DrawGLScene);  /* Register the function called when our window is resized. */  glutReshapeFunc(&ReSizeGLScene);  /* Register the function called when the keyboard is pressed. */  glutKeyboardFunc(&keyPressed);  /* Initialize our window. */  InitGL(640, 480);  /* Start Event Processing Engine */  glutMainLoop();  return 1;}