/home/mcpain/RPM/BUILD/kwin-5.11.4/kcmkwin/kwindecoration/declarative-plugin/previewbridge.cpp: In member function 'virtual std::unique_ptr<KDecoration2::DecoratedClientPrivate> KDecoration2::Preview::PreviewBridge::createClient(KDecorat
ion2::DecoratedClient*, KDecoration2::Decoration*)':
/home/mcpain/RPM/BUILD/kwin-5.11.4/kcmkwin/kwindecoration/declarative-plugin/previewbridge.cpp:61:83: error: invalid new-expression of abstract class type 'KDecoration2::Preview::PreviewClient'
     auto ptr = std::unique_ptr<PreviewClient>(new PreviewClient(client, decoration));
                                                                                   ^
In file included from /home/mcpain/RPM/BUILD/kwin-5.11.4/kcmkwin/kwindecoration/declarative-plugin/previewbridge.cpp:21:0:
/home/mcpain/RPM/BUILD/kwin-5.11.4/kcmkwin/kwindecoration/declarative-plugin/previewclient.h:36:7: note:   because the following virtual functions are pure within 'KDecoration2::Preview::PreviewClient':
 class PreviewClient : public QObject, public ApplicationMenuEnabledDecoratedClientPrivate
       ^~~~~~~~~~~~~
In file included from /usr/include/KDecoration2/KDecoration2/Private/DecoratedClientPrivate:1:0,
                 from /home/mcpain/RPM/BUILD/kwin-5.11.4/kcmkwin/kwindecoration/declarative-plugin/previewclient.h:25,
                 from /home/mcpain/RPM/BUILD/kwin-5.11.4/kcmkwin/kwindecoration/declarative-plugin/previewbridge.cpp:21:
/usr/include/KDecoration2/kdecoration2/private/decoratedclientprivate.h:79:18: note:    virtual void KDecoration2::DecoratedClientPrivate::requestShowToolTip(QString&)
     virtual void requestShowToolTip(QString &text) = 0;
                  ^~~~~~~~~~~~~~~~~~
/usr/include/KDecoration2/kdecoration2/private/decoratedclientprivate.h:80:18: note:    virtual void KDecoration2::DecoratedClientPrivate::requestHideToolTip()
     virtual void requestHideToolTip() = 0;
                  ^~~~~~~~~~~~~~~~~~