simulation: SimGrid is a library, not a program. So you need to define
your own ``main()`` function as follows. This function is in charge of
creating a SimGrid simulation engine (on line 3), register the actor
simulation: SimGrid is a library, not a program. So you need to define
your own ``main()`` function as follows. This function is in charge of
creating a SimGrid simulation engine (on line 3), register the actor