/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.h
/usr/include/KF5/KPeople/kpeople/kpeople_export.h
/usr/include/KF5/KPeople/kpeople/persondata.h
/usr/include/KF5/KPeople/kpeople/personsmodel.h
/usr/include/KF5/KPeople/kpeople/widgets/
/usr/include/KF5/KPeople/kpeople/widgets/abstractfieldwidgetfactory.h
/usr/include/KF5/KPeople/kpeople/widgets/actions.h
/usr/include/KF5/KPeople/kpeople/widgets/mergedialog.h
/usr/include/KF5/KPeople/kpeople/widgets/persondetailsdialog.h
/usr/include/KF5/KPeople/kpeople/widgets/persondetailsview.h
/usr/include/KF5/KPeople/kpeoplebackend/abstractcontact.h
/usr/include/KF5/KPeople/kpeoplebackend/abstractpersonaction.h
/usr/include/KF5/KPeople/kpeoplebackend/allcontactsmonitor.h
/usr/include/KF5/KPeople/kpeoplebackend/basepersonsdatasource.h
/usr/include/KF5/KPeople/kpeoplebackend/contactmonitor.h