This is an auto-filed bug because app-backup/spideroak-bin installs files with unresolved SONAME dependencies. 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.
Created attachment 642806 [details] build.log build log and emerge --info
tinderbox has reproduced this issue with version 7.5.0-r1 - Updating summary.
dash_tinderbox has reproduced this issue with version 7.5.0-r2 - Updating summary.
tinderbox_musl has reproduced this issue with version 7.5.0-r3 - Updating summary.