Gentoo's Bugzilla –
Attachment 383594 Details for
Bug 520926dev-libs/protobuf-c-1.0.1 with dev-libs/protobuf-2.6.0 - t/test-full.proto: "foo.VALUE_B" uses the same enum value as "foo.VALUE_A". If this is intended, set 'option allow_alias = true;' to the enum definition.