Comment # 2 on bug 1131759 from Wolfgang Bauer

PS: knotifications is required since this upstream change in 5.56.0:
https://cgit.kde.org/purpose.git/commit/?id=a6d93ff28f090dd0086301884a31e0eea0efd845

I.e. Leap 15.1 is not affected, the 5.55 package does still build the plugin.