I just completed:
emerge --newuse --update --deep world
revdep-rebuild did not complain or do anything about
which was broken due to a new version of libpoppler.
I guess some more files in that directory were broken.
I could not print due to this problem.
manually emerging net-print/cups-filters fixed it for me (for now), but took me 20 minutes of bug chasing.
Which version of gentoolkit do you have installed?
Latest version available: 0.3.0.6-r3
Latest version installed: 0.3.0.6-r3
This is fixed now via subslot dependency.