Using Make in frequent cron job

[Kenneth Porter <shiva@xxxxxxxxxxxxxxx>]

Is there a way to get Make to be silent when it does nothing, but have its 
normal verbosity when something is made?

I want to use Make in a frequent cron job (every 1/2 hour, perhaps 10 
minutes) but I don't want to get a bunch of emails telling me nothing was 
done (which will be most of the time). I just want to know when it found 
something to do.
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