How do I invoke a shell command during the parsing phase?

From: msheppard_climax (msheppard_at_[hidden])
Date: 2003-09-25 08:25:38

Hi,

I want to invoke a shell command during the parsing phase which will
update a source target with information from the Jamfile, but I can't
see how to do it. I'm looking for the Jam equivalent of doing:

$(shell whatever 2>&1 >/dev/null)

in GNU Make. Is there a way to do that in Boost Jam?

Thanks,
Mark.