how to add fc10-update branch?

[Carl Byington <carl five-ten-sg com>]

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I have a package (libpst) that I was building for f10 by:

cd fedora/$NAME/devel
cvs update
make new-sources FILES=$BALL
cvs commit -m "update to $VER"
make tag
make build

That worked to build dist-f10 packages, and of course it now builds a
dist-f11 package. What steps do I need to build an updated f10 package,
presumably going into something like dist-f10-updates-candidate that
can then be (eventually) fetched via yum update?

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