I just completed: emerge --newuse --update --deep world emerge --depclean revdep-rebuild revdep-rebuild did not complain or do anything about /usr/libexec/cups/filter/pdftopdf 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?
* app-portage/gentoolkit Latest version available: 0.3.0.6-r3 Latest version installed: 0.3.0.6-r3
This is fixed now via subslot dependency.