libksysguard still depends on qtwebkit, which was deprecated by the qt developers in the latest release. you can still build it from source, but it would be a good idea to migrate away from it. use something like webengine instead. Reproducible: Always Steps to Reproduce: 1. try to build libksysguard without qtwebkit installed 2. 3. Actual Results: it builds without gui Expected Results: it builds the gui component as well
With KDE Applications 16.08, ksysguard seems to be the only application depending on Qt WebKit. It should be migrated to either use QML for the memory details view or WebEngine.
KSysguard is a workspace component. As long as https://bugreports.qt.io/browse/QTBUG-55384 is not fixed we should not port any workspace component to WebEngine.
This has happened some time in the past nearly-four years. (The bug Martin refers to has been fixed since Qt 5.10, it seems)