This is an auto-filled bug because dev-libs/zlog fails to compile. 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 639126 [details] build.log build log and emerge --info
Add v1.2.14 which both fixes this and removes need for the two patches of the old version.