As the proper directory for udev rules is now /lib/udev/rules.d for all systems, please fix the ebuild to properly install the udev bits there instead of the current /$(get_libdir)/udev.
+*hplip-3.11.10-r2 (08 Dec 2011) + + 08 Dec 2011; Daniel Pielmeier <billie@gentoo.org> -hplip-3.11.10-r1.ebuild, + +hplip-3.11.10-r2.ebuild: + Install udev rules into /lib/udev/rules.d. This fixes bug #393339. Thanks to + Jonathan Callen for the report.