This is an auto-filled bug because app-crypt/sbsigntools calls ar directly.
The issue was originally discovered on arm64, but it may be reproducible on other arches as well.
Attached build log and emerge --info.
To reproduce this issue you may want to temporarily move the /usr/bin/ar binary.
Created attachment 633654 [details]
build log and emerge --info
ci has reproduced this issue with version 0.9.4 - Updating summary.