/usr/include/ is in libkactivities-dev 4:4.13.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/KDE/
/usr/include/KDE/KActivities/
/usr/include/KDE/KActivities/Info
/usr/include/KDE/KActivities/Consumer
/usr/include/KDE/KActivities/ResourceInstance
/usr/include/KDE/KActivities/Models/
/usr/include/KDE/KActivities/Models/ResourceModel
/usr/include/KDE/KActivities/Models/ActivityModel
/usr/include/KDE/KActivities/Version
/usr/include/KDE/KActivities/Controller
/usr/include/kactivities/
/usr/include/kactivities/resourceinstance.h
/usr/include/kactivities/info.h
/usr/include/kactivities/version.h
/usr/include/kactivities/controller.h
/usr/include/kactivities/kactivities_export.h
/usr/include/kactivities/consumer.h
/usr/include/kactivities-models/
/usr/include/kactivities-models/kactivities_models_export.h
/usr/include/kactivities-models/activitymodel.h
/usr/include/kactivities-models/resourcemodel.h