/usr/include/evolution-data-server/libecal/ is in libecal1.2-dev 3.18.5-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/evolution-data-server/libecal/e-cal-check-timezones.h
/usr/include/evolution-data-server/libecal/e-cal-client-view.h
/usr/include/evolution-data-server/libecal/e-cal-client.h
/usr/include/evolution-data-server/libecal/e-cal-component.h
/usr/include/evolution-data-server/libecal/e-cal-enumtypes.h
/usr/include/evolution-data-server/libecal/e-cal-recur.h
/usr/include/evolution-data-server/libecal/e-cal-system-timezone.h
/usr/include/evolution-data-server/libecal/e-cal-time-util.h
/usr/include/evolution-data-server/libecal/e-cal-types.h
/usr/include/evolution-data-server/libecal/e-cal-util.h
/usr/include/evolution-data-server/libecal/e-cal-view.h
/usr/include/evolution-data-server/libecal/e-cal.h
/usr/include/evolution-data-server/libecal/e-timezone-cache.h
/usr/include/evolution-data-server/libecal/libecal.h