/usr/include/libkdegamesprivate/ is in libkdegames-dev 4:4.13.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libkdegamesprivate/kchatbase.h
/usr/include/libkdegamesprivate/kchatbaseitemdelegate.h
/usr/include/libkdegamesprivate/kchatbasemodel.h
/usr/include/libkdegamesprivate/kgame/
/usr/include/libkdegamesprivate/kgame/kgame.h
/usr/include/libkdegamesprivate/kgame/kgamechat.h
/usr/include/libkdegamesprivate/kgame/kgameerror.h
/usr/include/libkdegamesprivate/kgame/kgameio.h
/usr/include/libkdegamesprivate/kgame/kgamemessage.h
/usr/include/libkdegamesprivate/kgame/kgamenetwork.h
/usr/include/libkdegamesprivate/kgame/kgameproperty.h
/usr/include/libkdegamesprivate/kgame/kgamepropertyhandler.h
/usr/include/libkdegamesprivate/kgame/kgamesequence.h
/usr/include/libkdegamesprivate/kgame/kgameversion.h
/usr/include/libkdegamesprivate/kgame/kmessageclient.h
/usr/include/libkdegamesprivate/kgame/kmessageio.h
/usr/include/libkdegamesprivate/kgame/kmessageserver.h
/usr/include/libkdegamesprivate/kgame/kplayer.h
/usr/include/libkdegamesprivate/kgamecanvas.h
/usr/include/libkdegamesprivate/kgamedifficulty.h
/usr/include/libkdegamesprivate/kgamesvgdocument.h
/usr/include/libkdegamesprivate/kgametheme.h
/usr/include/libkdegamesprivate/kgamethemeselector.h
/usr/include/libkdegamesprivate/libkdegamesprivate_export.h