/usr/include/KF5/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/
/usr/include/KF5/KContacts/KContacts/Address
/usr/include/KF5/KContacts/KContacts/Addressee
/usr/include/KF5/KContacts/KContacts/AddresseeList
/usr/include/KF5/KContacts/KContacts/CalendarUrl
/usr/include/KF5/KContacts/KContacts/ContactGroup
/usr/include/KF5/KContacts/KContacts/ContactGroupTool
/usr/include/KF5/KContacts/KContacts/Email
/usr/include/KF5/KContacts/KContacts/Field
/usr/include/KF5/KContacts/KContacts/Gender
/usr/include/KF5/KContacts/KContacts/Geo
/usr/include/KF5/KContacts/KContacts/Impp
/usr/include/KF5/KContacts/KContacts/Key
/usr/include/KF5/KContacts/KContacts/LDIFConverter
/usr/include/KF5/KContacts/KContacts/Lang
/usr/include/KF5/KContacts/KContacts/PhoneNumber
/usr/include/KF5/KContacts/KContacts/Picture
/usr/include/KF5/KContacts/KContacts/Related
/usr/include/KF5/KContacts/KContacts/ResourceLocatorUrl
/usr/include/KF5/KContacts/KContacts/Secrecy
/usr/include/KF5/KContacts/KContacts/SortMode
/usr/include/KF5/KContacts/KContacts/Sound
/usr/include/KF5/KContacts/KContacts/TimeZone
/usr/include/KF5/KContacts/KContacts/VCardConverter
/usr/include/KF5/KContacts/KContacts/VCardDrag
/usr/include/KF5/KContacts/kcontacts/
/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