The directory /usr/share/augeas/lenses contains lenses (text files) that Augeas (http://augeas.net/) uses to parse and process configuration files. This directory is currently owned by the augeas-libs RPM; since there are other packages (e.g. libvirt) that are interested in shipping lenses, that's not a good situation: installing Augeas should be a decision up to the user, and it is explicitly designed so that other packages can ship lens definitions without requiring Augeas itself - they only drop a text file into /usr/share/augeas/lenses to make themselves manageable by Augeas Hence %{_datadir}/lenses needs to be owned by a neutral third party, i.e. filesystem.
That should be %{_datadir}/augeas/lenses
Added in filesystem-2.4.19-1.fc10. Thanks, Read ya, Phil