/usr/include/KF5/KContacts/kcontacts/ is in libkf5contacts-dev 4:15.12.3-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/KF5/KContacts/kcontacts/address.h
/usr/include/KF5/KContacts/kcontacts/addressee.h
/usr/include/KF5/KContacts/kcontacts/addresseelist.h
/usr/include/KF5/KContacts/kcontacts/calendarurl.h
/usr/include/KF5/KContacts/kcontacts/contactgroup.h
/usr/include/KF5/KContacts/kcontacts/contactgrouptool.h
/usr/include/KF5/KContacts/kcontacts/email.h
/usr/include/KF5/KContacts/kcontacts/field.h
/usr/include/KF5/KContacts/kcontacts/gender.h
/usr/include/KF5/KContacts/kcontacts/geo.h
/usr/include/KF5/KContacts/kcontacts/impp.h
/usr/include/KF5/KContacts/kcontacts/kcontacts_export.h
/usr/include/KF5/KContacts/kcontacts/key.h
/usr/include/KF5/KContacts/kcontacts/lang.h
/usr/include/KF5/KContacts/kcontacts/ldifconverter.h
/usr/include/KF5/KContacts/kcontacts/phonenumber.h
/usr/include/KF5/KContacts/kcontacts/picture.h
/usr/include/KF5/KContacts/kcontacts/related.h
/usr/include/KF5/KContacts/kcontacts/resourcelocatorurl.h
/usr/include/KF5/KContacts/kcontacts/secrecy.h
/usr/include/KF5/KContacts/kcontacts/sortmode.h
/usr/include/KF5/KContacts/kcontacts/sound.h
/usr/include/KF5/KContacts/kcontacts/timezone.h
/usr/include/KF5/KContacts/kcontacts/vcardconverter.h
/usr/include/KF5/KContacts/kcontacts/vcarddrag.h