A fun fact: SL 6's version of yum tracks the histories of packages and
from where they originate so things like ``yumdb info $packagename'' are
possible. But for this to work all package maintenance has to go
through yum, which is why running the rpm command above can generate
"rpmdb altered outside of yum" complaints later on. Yum can now install
packages by URI, so you can just replace the call to rpm with a call to yum: