This is an auto-filed bug because sci-astronomy/fitsh installs compressed files (manpages, documentation). 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 641694 [details] build.log build log and emerge --info
tinderbox has reproduced this issue with version 0.9.2 - Updating summary.