How to know that make buildworld finished

[Olivier Nicole]

Hi,

For testing purposes, I am trying to build a quite old (read slow)
machine. It happens that every time I start a buildworld, I will have
to leave before the end. And next morning the shell I was using to run
the buildworld will have terminated for some reason.

So I cannot see if the make did finished successfully or not.

Is there a way to check that make buildworld did finished
successfully?

TIA.

Olivier