It builds examples and then throws them away, for example plaintextedit.
They probably should be disabled in CMakeLists.txt to make the build lighter.
A commit references this bug:
Date: Sun Jun 23 13:39:36 UTC 2019
New revision: 504953
textproc/kf5-sonnet: disable building of examples
- examples are built but not installed, so don't build them
Reported by: yuri