Problem with Add or Remove Packages - Beginner

["Bradley \(FC2 List\)" <FedoraList@xxxxxxxxxxxxxxxx>]

I am trying to install Development Tools from "Add or Remove Packages"

I get an error that I am missing cyrus-sasl, libuser, and xorg-x11-libs and
will not continue.

When I try to install with YUM, it tells me that all packages are installed
and
up to date. Where do I go from here?

Thanks for a great list.
b