/usr/include/KF5/KHolidays/ is in libkf5holidays-dev 16.04.2-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/KF5/KHolidays/KHolidays/
/usr/include/KF5/KHolidays/KHolidays/AstroSeasons
/usr/include/KF5/KHolidays/KHolidays/Holiday
/usr/include/KF5/KHolidays/KHolidays/HolidayRegion
/usr/include/KF5/KHolidays/KHolidays/LunarPhase
/usr/include/KF5/KHolidays/KHolidays/Zodiac
/usr/include/KF5/KHolidays/kholidays/
/usr/include/KF5/KHolidays/kholidays/AstroSeasons
/usr/include/KF5/KHolidays/kholidays/Holiday
/usr/include/KF5/KHolidays/kholidays/HolidayRegion
/usr/include/KF5/KHolidays/kholidays/LunarPhase
/usr/include/KF5/KHolidays/kholidays/Zodiac
/usr/include/KF5/KHolidays/kholidays/astroseasons.h
/usr/include/KF5/KHolidays/kholidays/holiday.h
/usr/include/KF5/KHolidays/kholidays/holidayregion.h
/usr/include/KF5/KHolidays/kholidays/kholidays_export.h
/usr/include/KF5/KHolidays/kholidays/lunarphase.h
/usr/include/KF5/KHolidays/kholidays/zodiac.h