/usr/include/CGAL/Polygon_mesh_processing/ is in libcgal-dev 4.7-4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/CGAL/Polygon_mesh_processing/compute_normal.h
/usr/include/CGAL/Polygon_mesh_processing/connected_components.h
/usr/include/CGAL/Polygon_mesh_processing/distance.h
/usr/include/CGAL/Polygon_mesh_processing/fair.h
/usr/include/CGAL/Polygon_mesh_processing/internal/
/usr/include/CGAL/Polygon_mesh_processing/internal/Hole_filling/
/usr/include/CGAL/Polygon_mesh_processing/internal/Hole_filling/Triangulate_hole_polygon_mesh.h
/usr/include/CGAL/Polygon_mesh_processing/internal/Hole_filling/Triangulate_hole_polyline.h
/usr/include/CGAL/Polygon_mesh_processing/internal/Hole_filling/Weights.h
/usr/include/CGAL/Polygon_mesh_processing/internal/Hole_filling/do_not_use_DT3.h
/usr/include/CGAL/Polygon_mesh_processing/internal/Hole_filling/experimental/
/usr/include/CGAL/Polygon_mesh_processing/internal/Hole_filling/experimental/experimental_code.h
/usr/include/CGAL/Polygon_mesh_processing/internal/Polygon_mesh_slicer/
/usr/include/CGAL/Polygon_mesh_processing/internal/Polygon_mesh_slicer/Axis_parallel_plane_traits.h
/usr/include/CGAL/Polygon_mesh_processing/internal/Polygon_mesh_slicer/Traversal_traits.h
/usr/include/CGAL/Polygon_mesh_processing/internal/Side_of_triangle_mesh/
/usr/include/CGAL/Polygon_mesh_processing/internal/Side_of_triangle_mesh/AABB_triangle_accessor_3_primitive.h
/usr/include/CGAL/Polygon_mesh_processing/internal/Side_of_triangle_mesh/Point_inside_vertical_ray_cast.h
/usr/include/CGAL/Polygon_mesh_processing/internal/Side_of_triangle_mesh/Ray_3_Triangle_3_traversal_traits.h
/usr/include/CGAL/Polygon_mesh_processing/internal/fair_impl.h
/usr/include/CGAL/Polygon_mesh_processing/internal/named_function_params.h
/usr/include/CGAL/Polygon_mesh_processing/internal/named_params_helper.h
/usr/include/CGAL/Polygon_mesh_processing/internal/refine_impl.h
/usr/include/CGAL/Polygon_mesh_processing/orient_polygon_soup.h
/usr/include/CGAL/Polygon_mesh_processing/orientation.h
/usr/include/CGAL/Polygon_mesh_processing/polygon_soup_to_polygon_mesh.h
/usr/include/CGAL/Polygon_mesh_processing/refine.h
/usr/include/CGAL/Polygon_mesh_processing/repair.h
/usr/include/CGAL/Polygon_mesh_processing/self_intersections.h
/usr/include/CGAL/Polygon_mesh_processing/stitch_borders.h
/usr/include/CGAL/Polygon_mesh_processing/triangulate_faces.h
/usr/include/CGAL/Polygon_mesh_processing/triangulate_hole.h