call glutInit(), bug 11486
diff --git a/progs/demos/geartrain.c b/progs/demos/geartrain.c
index 3feb2a0..8363f2a 100644
--- a/progs/demos/geartrain.c
+++ b/progs/demos/geartrain.c
@@ -1053,6 +1053,7 @@
     else
        file = argv[1];
 
+    glutInit(&argc, argv); 
     glutInitWindowPosition (0, 0);
     glutInitWindowSize(640,480);
     glutInitDisplayMode (GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );