***************
*** 263,269 ****
  
  /**************************************** main() ********************/
  
- void main(int argc, char* argv[])
  {
    /****************************************/
    /*   Initialize GLUT and create window  */
--- 263,269 ----
  
  /**************************************** main() ********************/
  
+ int main(int argc, char* argv[])
  {
    /****************************************/
    /*   Initialize GLUT and create window  */
***************
*** 392,396 ****
  
    /**** Regular GLUT main loop ****/  
    glutMainLoop();
  }
  
--- 392,397 ----
  
    /**** Regular GLUT main loop ****/  
    glutMainLoop();
+   return 0;
  }