Forgot how to set up cvsup

I'm trying to set up cvsup on a new machine to snarf the postgres cvs
repository. I've had my machine at home set up for so long, I can't
remember how the $CVSROOT/CVSROOT part of my local repository directory
tree came into being. Should it be imported from postgresql.org as is
the pgsql part of the repository? Or should I set it up locally? The
pgsql part of the tree shows up just fine; I'm just not sure how the
other piece gets there. btw, I'm using an identical cvsup client
configuration file on both machines.
                         - Tom