This is an auto-filed bug because sci-mathematics/form installs pre-stripped files.
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 641962 [details]
build log and emerge --info
tinderbox has reproduced this issue with version 4.2.1 - Updating summary.