/usr/include/ is in libkf5webkit-dev 5.18.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/KF5/
/usr/include/KF5/kdewebkit_version.h
/usr/include/KF5/KDEWebKit/
/usr/include/KF5/KDEWebKit/kwebpage.h
/usr/include/KF5/KDEWebKit/KWebPluginFactory
/usr/include/KF5/KDEWebKit/KWebWallet
/usr/include/KF5/KDEWebKit/KGraphicsWebView
/usr/include/KF5/KDEWebKit/kgraphicswebview.h
/usr/include/KF5/KDEWebKit/kwebview.h
/usr/include/KF5/KDEWebKit/KWebView
/usr/include/KF5/KDEWebKit/kwebwallet.h
/usr/include/KF5/KDEWebKit/KWebPage
/usr/include/KF5/KDEWebKit/kdewebkit_export.h
/usr/include/KF5/KDEWebKit/kwebpluginfactory.h