/usr/include/KF5/KPeople/KPeople/ is in libkf5people-dev 5.28.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/KF5/KPeople/KPeople/Global
/usr/include/KF5/KPeople/KPeople/PersonData
/usr/include/KF5/KPeople/KPeople/PersonsModel
/usr/include/KF5/KPeople/KPeople/Widgets/
/usr/include/KF5/KPeople/KPeople/Widgets/AbstractFieldWidgetFactory
/usr/include/KF5/KPeople/KPeople/Widgets/Actions
/usr/include/KF5/KPeople/KPeople/Widgets/MergeDialog
/usr/include/KF5/KPeople/KPeople/Widgets/PersonDetailsDialog
/usr/include/KF5/KPeople/KPeople/Widgets/PersonDetailsView
/usr/include/KF5/KPeople/KPeopleBackend/AbstractContact
/usr/include/KF5/KPeople/KPeopleBackend/AbstractPersonAction
/usr/include/KF5/KPeople/KPeopleBackend/AllContactsMonitor
/usr/include/KF5/KPeople/KPeopleBackend/BasePersonsDataSource
/usr/include/KF5/KPeople/KPeopleBackend/ContactMonitor