/usr/include/KF5/KXmlGui/ is in libkf5xmlgui-dev 5.18.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/KF5/KXmlGui/KAboutApplicationDialog
/usr/include/KF5/KXmlGui/KActionCategory
/usr/include/KF5/KXmlGui/KActionCollection
/usr/include/KF5/KXmlGui/KBugReport
/usr/include/KF5/KXmlGui/KEditToolBar
/usr/include/KF5/KXmlGui/KHelpMenu
/usr/include/KF5/KXmlGui/KKeySequenceWidget
/usr/include/KF5/KXmlGui/KMainWindow
/usr/include/KF5/KXmlGui/KShortcutWidget
/usr/include/KF5/KXmlGui/KShortcutsDialog
/usr/include/KF5/KXmlGui/KShortcutsEditor
/usr/include/KF5/KXmlGui/KToggleToolBarAction
/usr/include/KF5/KXmlGui/KToolBar
/usr/include/KF5/KXmlGui/KUndoActions
/usr/include/KF5/KXmlGui/KXMLGUIBuilder
/usr/include/KF5/KXmlGui/KXMLGUIClient
/usr/include/KF5/KXmlGui/KXMLGUIFactory
/usr/include/KF5/KXmlGui/KXmlGuiWindow
/usr/include/KF5/KXmlGui/kaboutapplicationdialog.h
/usr/include/KF5/KXmlGui/kactioncategory.h
/usr/include/KF5/KXmlGui/kactioncollection.h
/usr/include/KF5/KXmlGui/kbugreport.h
/usr/include/KF5/KXmlGui/kedittoolbar.h
/usr/include/KF5/KXmlGui/kgesture_p.h
/usr/include/KF5/KXmlGui/kgesturemap_p.h
/usr/include/KF5/KXmlGui/khelpmenu.h
/usr/include/KF5/KXmlGui/kkeysequencewidget.h
/usr/include/KF5/KXmlGui/kmainwindow.h
/usr/include/KF5/KXmlGui/kshortcutsdialog.h
/usr/include/KF5/KXmlGui/kshortcutseditor.h
/usr/include/KF5/KXmlGui/kshortcutwidget.h
/usr/include/KF5/KXmlGui/ktoggletoolbaraction.h
/usr/include/KF5/KXmlGui/ktoolbar.h
/usr/include/KF5/KXmlGui/kundoactions.h
/usr/include/KF5/KXmlGui/kxmlgui_export.h
/usr/include/KF5/KXmlGui/kxmlguibuilder.h
/usr/include/KF5/KXmlGui/kxmlguiclient.h
/usr/include/KF5/KXmlGui/kxmlguifactory.h
/usr/include/KF5/KXmlGui/kxmlguiwindow.h