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diff --git a/progs/redbook/torus.c b/progs/redbook/torus.c
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+/*
+ * Copyright (c) 1993-1997, Silicon Graphics, Inc.
+ * ALL RIGHTS RESERVED 
+ * Permission to use, copy, modify, and distribute this software for 
+ * any purpose and without fee is hereby granted, provided that the above
+ * copyright notice appear in all copies and that both the copyright notice
+ * and this permission notice appear in supporting documentation, and that 
+ * the name of Silicon Graphics, Inc. not be used in advertising
+ * or publicity pertaining to distribution of the software without specific,
+ * written prior permission. 
+ *
+ * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
+ * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
+ * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
+ * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
+ * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
+ * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
+ * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
+ * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
+ * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
+ * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
+ * 
+ * US Government Users Restricted Rights 
+ * Use, duplication, or disclosure by the Government is subject to
+ * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
+ * (c)(1)(ii) of the Rights in Technical Data and Computer Software
+ * clause at DFARS 252.227-7013 and/or in similar or successor
+ * clauses in the FAR or the DOD or NASA FAR Supplement.
+ * Unpublished-- rights reserved under the copyright laws of the
+ * United States.  Contractor/manufacturer is Silicon Graphics,
+ * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
+ *
+ * OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
+ */
+
+/*
+ *  torus.c
+ *  This program demonstrates the creation of a display list.
+ */
+
+#include <GL/glut.h>
+#include <stdio.h>
+#include <math.h>
+#include <stdlib.h>
+
+/* Some <math.h> files do not define M_PI... */
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
+
+GLuint theTorus;
+
+/* Draw a torus */
+static void torus(int numc, int numt)
+{
+   int i, j, k;
+   double s, t, x, y, z, twopi;
+
+   twopi = 2 * (double)M_PI;
+   for (i = 0; i < numc; i++) {
+      glBegin(GL_QUAD_STRIP);
+      for (j = 0; j <= numt; j++) {
+         for (k = 1; k >= 0; k--) {
+            s = (i + k) % numc + 0.5;
+            t = j % numt;
+
+            x = (1+.1*cos(s*twopi/numc))*cos(t*twopi/numt);
+            y = (1+.1*cos(s*twopi/numc))*sin(t*twopi/numt);
+            z = .1 * sin(s * twopi / numc);
+            glVertex3f(x, y, z);
+         }
+      }
+      glEnd();
+   }
+}
+
+/* Create display list with Torus and initialize state */
+static void init(void)
+{
+   theTorus = glGenLists (1);
+   glNewList(theTorus, GL_COMPILE);
+   torus(8, 25);
+   glEndList();
+
+   glShadeModel(GL_FLAT);
+   glClearColor(0.0, 0.0, 0.0, 0.0);
+}
+
+/* Clear window and draw torus */
+void display(void)
+{
+   glClear(GL_COLOR_BUFFER_BIT);
+   glColor3f (1.0, 1.0, 1.0);
+   glCallList(theTorus);
+   glFlush();
+}
+
+/* Handle window resize */
+void reshape(int w, int h)
+{
+   glViewport(0, 0, (GLsizei) w, (GLsizei) h);
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   gluPerspective(30, (GLfloat) w/(GLfloat) h, 1.0, 100.0);
+   glMatrixMode(GL_MODELVIEW);
+   glLoadIdentity();
+   gluLookAt(0, 0, 10, 0, 0, 0, 0, 1, 0);
+}
+
+/* Rotate about x-axis when "x" typed; rotate about y-axis
+   when "y" typed; "i" returns torus to original view */
+/* ARGSUSED1 */
+void keyboard(unsigned char key, int x, int y)
+{
+   switch (key) {
+   case 'x':
+   case 'X':
+      glRotatef(30.,1.0,0.0,0.0);
+      glutPostRedisplay();
+      break;
+   case 'y':
+   case 'Y':
+      glRotatef(30.,0.0,1.0,0.0);
+      glutPostRedisplay();
+      break;
+   case 'i':
+   case 'I':
+      glLoadIdentity();
+      gluLookAt(0, 0, 10, 0, 0, 0, 0, 1, 0);
+      glutPostRedisplay();
+      break;
+   case 27:
+      exit(0);
+      break;
+   }
+}
+
+int main(int argc, char **argv)
+{
+   glutInitWindowSize(200, 200);
+   glutInit(&argc, argv);
+   glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
+   glutCreateWindow(argv[0]);
+   init();
+   glutReshapeFunc(reshape);
+   glutKeyboardFunc(keyboard);
+   glutDisplayFunc(display);
+   glutMainLoop();
+   return 0;
+}