Binary package “libkde3support4” in ubuntu bionic

KDE 3 Support Library for the KDE 4 Platform

 The classes here are only for convenience of porting from KDE 3 to KDE 4
 Platform. They are not supposed to be used for a long time. You should move on
 to replacement classes provided by the framework or implement something
 yourself in the long run.
 .
 This package is part of the KDE Development Platform libraries module.