This is an auto-filed bug because www-apps/nanoc fails tests. The issue was originally discovered on amd64, but it may be reproducible on other arches as well. If you think that a different summary clarifies the issue better, feel free to change it. Attached build log and emerge --info. NOTE: If you need further logs, feel free to ask.
Created attachment 642494 [details] build.log build log and emerge --info
www-apps/nanoc has been split up and www-apps/nanoc-core now has a dependency on dev-ruby/rspec-its, so I assume this has been fixed.