The ebuild for "hplip" installs this file: /usr/share/hal/fdi/preprobe/10osvendor/20-hplip-devices.fdi but it's no more required because HAL does not exists anymore. So it should be dropped.
It's a harmless file and already fixed in later versions, hplip-3.12.2-r2.ebuild: # Remove hal fdi files hplip-3.12.2-r2.ebuild: rm -rf "${D}"/usr/share/hal || die hplip-3.12.4.ebuild: # Remove hal fdi files hplip-3.12.4.ebuild: rm -rf "${D}"/usr/share/hal || die Thanks for reporting, but not worth to do anything here as next stabilization will autoresolve this bug