Old code:

static void Box_Normal(VECTOR Result, OBJECT *Object, INTERSECTION *Inter)
{
  switch (Inter->i1)
  {
    case SIDE_X_0: Make_Vector(Result, -1.0,  0.0,  0.0); break;
    case SIDE_X_1: Make_Vector(Result,  1.0,  0.0,  0.0); break;
    case SIDE_Y_0: Make_Vector(Result,  0.0, -1.0,  0.0); break;
    case SIDE_Y_1: Make_Vector(Result,  0.0,  1.0,  0.0); break;
    case SIDE_Z_0: Make_Vector(Result,  0.0,  0.0, -1.0); break;
    case SIDE_Z_1: Make_Vector(Result,  0.0,  0.0,  1.0); break;

    default: Error("Unknown box side in Box_Normal().\n");
  }

  /* Transform the point into the boxes space. */

  if (((BOX *)Object)->Trans != NULL)
  {
    MTransNormal(Result, Result, ((BOX *)Object)->Trans);

    VNormalize(Result, Result);
  }
}

New code:
static void Box_Normal(VECTOR Result, OBJECT *Object, INTERSECTION *Inter)
{

 if (((BOX *)Object)->Trans == NULL )
  switch (Inter->i1)
   {
     case SIDE_X_0: Make_Vector(Result, -1.0,  0.0,  0.0); break;
     case SIDE_X_1: Make_Vector(Result,  1.0,  0.0,  0.0); break;
     case SIDE_Y_0: Make_Vector(Result,  0.0, -1.0,  0.0); break;
     case SIDE_Y_1: Make_Vector(Result,  0.0,  1.0,  0.0); break;
     case SIDE_Z_0: Make_Vector(Result,  0.0,  0.0, -1.0); break;
     case SIDE_Z_1: Make_Vector(Result,  0.0,  0.0,  1.0); break;

     default: Error("Unknown box side in Box_Normal().\n");
   }
 else
  switch (Inter->i1)
   {
     case SIDE_X_0: Assign_Vector(Result, ((BOX *)Object)->N_X_0); break;
     case SIDE_X_1: Assign_Vector(Result, ((BOX *)Object)->N_X_1); break;
     case SIDE_Y_0: Assign_Vector(Result, ((BOX *)Object)->N_Y_0); break;
     case SIDE_Y_1: Assign_Vector(Result, ((BOX *)Object)->N_Y_1); break;
     case SIDE_Z_0: Assign_Vector(Result, ((BOX *)Object)->N_Z_0); break;
     case SIDE_Z_1: Assign_Vector(Result, ((BOX *)Object)->N_Z_1); break;

     default: Error("Unknown box side in Box_Normal().\n");
   }

}

Complete source at  page -- Box' patch -- via
http://members.xoom.com/dmilos/pov/mypovpage.htm

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