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diff --git a/progs/redbook/polyoff.c b/progs/redbook/polyoff.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+ * Unpublished-- rights reserved under the copyright laws of the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.
+ */
+
+/*
+ *  polyoff.c
+ *  This program demonstrates polygon offset to draw a shaded
+ *  polygon and its wireframe counterpart without ugly visual
+ *  artifacts ("stitching").
+ */
+#include <GL/glut.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifdef GL_VERSION_1_1
+GLuint list;
+GLint spinx = 0;
+GLint spiny = 0;
+GLfloat tdist = 0.0;
+GLfloat polyfactor = 1.0;
+GLfloat polyunits = 1.0;
+
+/*  display() draws two spheres, one with a gray, diffuse material,
+ *  the other sphere with a magenta material with a specular highlight.
+ */
+void display (void)
+{
+    GLfloat gray[] = { 0.8, 0.8, 0.8, 1.0 };
+    GLfloat black[] = { 0.0, 0.0, 0.0, 1.0 };
+
+    glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    glPushMatrix ();
+    glTranslatef (0.0, 0.0, tdist);
+    glRotatef ((GLfloat) spinx, 1.0, 0.0, 0.0);
+    glRotatef ((GLfloat) spiny, 0.0, 1.0, 0.0);
+
+    glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, gray);
+    glMaterialfv(GL_FRONT, GL_SPECULAR, black);
+    glMaterialf(GL_FRONT, GL_SHININESS, 0.0);
+    glEnable(GL_LIGHTING);
+    glEnable(GL_LIGHT0);
+    glEnable(GL_POLYGON_OFFSET_FILL);
+    glPolygonOffset(polyfactor, polyunits);
+    glCallList (list);
+    glDisable(GL_POLYGON_OFFSET_FILL);
+
+    glDisable(GL_LIGHTING);
+    glDisable(GL_LIGHT0);
+    glColor3f (1.0, 1.0, 1.0);
+    glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+    glCallList (list);
+    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+
+    glPopMatrix ();
+    glFlush ();
+}
+
+/*  specify initial properties
+ *  create display list with sphere  
+ *  initialize lighting and depth buffer
+ */
+void gfxinit (void)
+{
+    GLfloat light_ambient[] = { 0.0, 0.0, 0.0, 1.0 };
+    GLfloat light_diffuse[] = { 1.0, 1.0, 1.0, 1.0 };
+    GLfloat light_specular[] = { 1.0, 1.0, 1.0, 1.0 };
+    GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 };
+
+    GLfloat global_ambient[] = { 0.2, 0.2, 0.2, 1.0 };
+
+    glClearColor (0.0, 0.0, 0.0, 1.0);
+
+    list = glGenLists(1);
+    glNewList (list, GL_COMPILE);
+       glutSolidSphere(1.0, 20, 12);
+    glEndList ();
+
+    glEnable(GL_DEPTH_TEST);
+
+    glLightfv (GL_LIGHT0, GL_AMBIENT, light_ambient);
+    glLightfv (GL_LIGHT0, GL_DIFFUSE, light_diffuse);
+    glLightfv (GL_LIGHT0, GL_SPECULAR, light_specular);
+    glLightfv (GL_LIGHT0, GL_POSITION, light_position);
+    glLightModelfv (GL_LIGHT_MODEL_AMBIENT, global_ambient);
+}
+
+/*  call when window is resized  */
+void reshape(int width, int height)
+{
+    glViewport (0, 0, width, height);
+    glMatrixMode (GL_PROJECTION);
+    glLoadIdentity ();
+    gluPerspective(45.0, (GLdouble)width/(GLdouble)height,
+	    1.0, 10.0);
+    glMatrixMode (GL_MODELVIEW);
+    glLoadIdentity ();
+    gluLookAt (0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
+}
+
+/*  call when mouse button is pressed  */
+/* ARGSUSED2 */
+void mouse(int button, int state, int x, int y) {
+    switch (button) {
+	case GLUT_LEFT_BUTTON:
+	    switch (state) {
+		case GLUT_DOWN:
+		    spinx = (spinx + 5) % 360; 
+                    glutPostRedisplay();
+		    break;
+		default:
+		    break;
+            }
+            break;
+	case GLUT_MIDDLE_BUTTON:
+	    switch (state) {
+		case GLUT_DOWN:
+		    spiny = (spiny + 5) % 360; 
+                    glutPostRedisplay();
+		    break;
+		default:
+		    break;
+            }
+            break;
+	case GLUT_RIGHT_BUTTON:
+	    switch (state) {
+		case GLUT_UP:
+		    exit(0);
+		    break;
+		default:
+		    break;
+            }
+            break;
+        default:
+            break;
+    }
+}
+
+/* ARGSUSED1 */
+void keyboard (unsigned char key, int x, int y)
+{
+   switch (key) {
+      case 't':
+         if (tdist < 4.0) {
+            tdist = (tdist + 0.5);
+            glutPostRedisplay();
+         }
+         break;
+      case 'T':
+         if (tdist > -5.0) {
+            tdist = (tdist - 0.5);
+            glutPostRedisplay();
+         }
+         break;
+      case 'F':
+         polyfactor = polyfactor + 0.1;
+	 printf ("polyfactor is %f\n", polyfactor);
+         glutPostRedisplay();
+         break;
+      case 'f':
+         polyfactor = polyfactor - 0.1;
+	 printf ("polyfactor is %f\n", polyfactor);
+         glutPostRedisplay();
+         break;
+      case 'U':
+         polyunits = polyunits + 1.0;
+	 printf ("polyunits is %f\n", polyunits);
+         glutPostRedisplay();
+         break;
+      case 'u':
+         polyunits = polyunits - 1.0;
+	 printf ("polyunits is %f\n", polyunits);
+         glutPostRedisplay();
+         break;
+      default:
+         break;
+   }
+}
+
+/*  Main Loop
+ *  Open window with initial window size, title bar, 
+ *  RGBA display mode, and handle input events.
+ */
+int main(int argc, char** argv)
+{
+    glutInit(&argc, argv);
+    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
+    glutCreateWindow(argv[0]);
+    glutReshapeFunc(reshape);
+    glutDisplayFunc(display);
+    glutMouseFunc(mouse);
+    glutKeyboardFunc(keyboard);
+    gfxinit();
+    glutMainLoop();
+    return 0;
+}
+#else
+int main(int argc, char** argv)
+{
+    fprintf (stderr, "This program demonstrates a feature which is not in OpenGL Version 1.0.\n");
+    fprintf (stderr, "If your implementation of OpenGL Version 1.0 has the right extensions,\n");
+    fprintf (stderr, "you may be able to modify this program to make it run.\n");
+    return 0;
+}
+#endif