According to Protobuf, The latest version is 2.5.0, we need to add a new ebuild for this. https://code.google.com/p/protobuf/downloads/list
As a user who want to be developer, I would like to submit an ebuild in 12 hours, if Tim Harder have some thing else to do:)
*protobuf-2.5.0 (05 Mar 2013) 05 Mar 2013; Tim Harder <radhermit@gentoo.org> +protobuf-2.5.0.ebuild: Version bump. Migrate to distutils-r1 and add subslot.
(In reply to comment #2) > *protobuf-2.5.0 (05 Mar 2013) > > 05 Mar 2013; Tim Harder <radhermit@gentoo.org> +protobuf-2.5.0.ebuild: > Version bump. Migrate to distutils-r1 and add subslot. Thanks to Jouni Kosonen, I submited an INVALID ISSUE.