PS, I just created a solution to all this:

  make 2>/dev/stdout | grep -i error | festival --tts

I have 'festival' speech synthesizer installed on my Pi4.

the keyword here is 'error'

If  the compiler stderr report contains any 'error' it will talk to you.
Set the volume high so you can hear it above the kids screaming.
Just tested this, 'tworks!

 one liner really

The above script deliberately does not respond to compiler 'warnings','
but you can obviously modify it in many ways.
So now you can go on with what you were doing even with monitor off.

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