/usr/include/CGAL/Three/ is in libcgal-dev 4.9-1+b2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/CGAL/Three/Polyhedron_demo_io_plugin_interface.h
/usr/include/CGAL/Three/Polyhedron_demo_plugin_helper.h
/usr/include/CGAL/Three/Polyhedron_demo_plugin_interface.h
/usr/include/CGAL/Three/Scene_draw_interface.h
/usr/include/CGAL/Three/Scene_group_item.h
/usr/include/CGAL/Three/Scene_interface.h
/usr/include/CGAL/Three/Scene_item.h
/usr/include/CGAL/Three/Scene_item_config.h
/usr/include/CGAL/Three/Scene_print_interface_item.h
/usr/include/CGAL/Three/TextRenderer.h
/usr/include/CGAL/Three/Viewer_config.h
/usr/include/CGAL/Three/Viewer_interface.h