/usr/include/CGAL/ImageIO/ is in libcgal-dev 4.11-2build1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/CGAL/ImageIO/analyze.h
/usr/include/CGAL/ImageIO/analyze_impl.h
/usr/include/CGAL/ImageIO/bmp.h
/usr/include/CGAL/ImageIO/bmp_impl.h
/usr/include/CGAL/ImageIO/bmpendian.h
/usr/include/CGAL/ImageIO/bmpendian_impl.h
/usr/include/CGAL/ImageIO/bmpread.h
/usr/include/CGAL/ImageIO/bmpread_impl.h
/usr/include/CGAL/ImageIO/bmptypes.h
/usr/include/CGAL/ImageIO/convert.h
/usr/include/CGAL/ImageIO/convert_impl.h
/usr/include/CGAL/ImageIO/fgetns.h
/usr/include/CGAL/ImageIO/fgetns_impl.h
/usr/include/CGAL/ImageIO/gif.h
/usr/include/CGAL/ImageIO/gif_impl.h
/usr/include/CGAL/ImageIO/gis.h
/usr/include/CGAL/ImageIO/gis_impl.h
/usr/include/CGAL/ImageIO/inr.h
/usr/include/CGAL/ImageIO/inr_impl.h
/usr/include/CGAL/ImageIO/iris.h
/usr/include/CGAL/ImageIO/iris_impl.h
/usr/include/CGAL/ImageIO/mincio.h
/usr/include/CGAL/ImageIO/mincio_impl.h
/usr/include/CGAL/ImageIO/pnm.h
/usr/include/CGAL/ImageIO/pnm_impl.h
/usr/include/CGAL/ImageIO/recbuffer.h
/usr/include/CGAL/ImageIO/recbuffer_impl.h
/usr/include/CGAL/ImageIO/recline.h
/usr/include/CGAL/ImageIO/recline_impl.h
/usr/include/CGAL/ImageIO/reech4x4.h
/usr/include/CGAL/ImageIO/reech4x4_impl.h
/usr/include/CGAL/ImageIO/typedefs.h