/usr/include/vxl/contrib/prip/ is in libvxl1-dev 1.17.0.dfsg-1+b2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/vxl/contrib/prip/vdtop/
/usr/include/vxl/contrib/prip/vdtop/vdtop_4_lower_homotopic_kernel.h
/usr/include/vxl/contrib/prip/vdtop/vdtop_4_lower_leveling_kernel.h
/usr/include/vxl/contrib/prip/vdtop/vdtop_4_upper_homotopic_kernel.h
/usr/include/vxl/contrib/prip/vdtop/vdtop_4_upper_leveling_kernel.h
/usr/include/vxl/contrib/prip/vdtop/vdtop_8_lower_homotopic_kernel.h
/usr/include/vxl/contrib/prip/vdtop/vdtop_8_lower_leveling_kernel.h
/usr/include/vxl/contrib/prip/vdtop/vdtop_8_neighborhood_mask.h
/usr/include/vxl/contrib/prip/vdtop/vdtop_8_upper_homotopic_kernel.h
/usr/include/vxl/contrib/prip/vdtop/vdtop_8_upper_leveling_kernel.h
/usr/include/vxl/contrib/prip/vdtop/vdtop_construct_well_composed.h
/usr/include/vxl/contrib/prip/vdtop/vdtop_draw_digital_graph.h
/usr/include/vxl/contrib/prip/vdtop/vdtop_freeman_code.h
/usr/include/vxl/contrib/prip/vdtop/vdtop_kernel.h
/usr/include/vxl/contrib/prip/vdtop/vdtop_misc.txx
/usr/include/vxl/contrib/prip/vdtop/vdtop_neighborhood.h
/usr/include/vxl/contrib/prip/vdtop/vdtop_pixel.h
/usr/include/vxl/contrib/prip/vdtop/vdtop_pixel.txx
/usr/include/vxl/contrib/prip/vdtop/vdtop_replace_quasi_8_minima.h
/usr/include/vxl/contrib/prip/vdtop/vdtop_set_4_veinerization_structure.h
/usr/include/vxl/contrib/prip/vdtop/vdtop_set_4_veinerization_structure.txx
/usr/include/vxl/contrib/prip/vdtop/vdtop_set_8_veinerization_structure.h
/usr/include/vxl/contrib/prip/vdtop/vdtop_set_8_veinerization_structure.txx
/usr/include/vxl/contrib/prip/vdtop/vdtop_set_structure_from_digital_graph.h
/usr/include/vxl/contrib/prip/vdtop/vdtop_set_structure_from_digital_graph.txx
/usr/include/vxl/contrib/prip/vdtop/vdtop_well_composed_lower_leveling_kernel.h
/usr/include/vxl/contrib/prip/vdtop/vil_canny_deriche_grad_filter.h
/usr/include/vxl/contrib/prip/vmap/
/usr/include/vxl/contrib/prip/vmap/vbl_controlled_partition.h
/usr/include/vxl/contrib/prip/vmap/vmap_2_map.h
/usr/include/vxl/contrib/prip/vmap/vmap_2_map.txx
/usr/include/vxl/contrib/prip/vmap/vmap_2_tmap.h
/usr/include/vxl/contrib/prip/vmap/vmap_2_tmap.txx
/usr/include/vxl/contrib/prip/vmap/vmap_2_tmap_elts.h
/usr/include/vxl/contrib/prip/vmap/vmap_grid_structure.h
/usr/include/vxl/contrib/prip/vmap/vmap_kernel.h
/usr/include/vxl/contrib/prip/vmap/vmap_kernel.txx
/usr/include/vxl/contrib/prip/vmap/vmap_map_iterator_wrapper.h
/usr/include/vxl/contrib/prip/vmap/vmap_non_oriented_kernel.h
/usr/include/vxl/contrib/prip/vmap/vmap_non_oriented_kernel.txx
/usr/include/vxl/contrib/prip/vmap/vmap_oriented_kernel.h
/usr/include/vxl/contrib/prip/vmap/vmap_oriented_kernel.txx
/usr/include/vxl/contrib/prip/vmap/vmap_ptr_sequences.h
/usr/include/vxl/contrib/prip/vmap/vmap_set_grid_structure.h
/usr/include/vxl/contrib/prip/vmap/vmap_types.h
/usr/include/vxl/contrib/prip/vpyr/
/usr/include/vxl/contrib/prip/vpyr/vpyr_2_pyramid.h
/usr/include/vxl/contrib/prip/vpyr/vpyr_2_pyramid.txx
/usr/include/vxl/contrib/prip/vpyr/vpyr_2_pyramid_base.h
/usr/include/vxl/contrib/prip/vpyr/vpyr_2_pyramid_level.h
/usr/include/vxl/contrib/prip/vpyr/vpyr_2_pyramid_level.txx
/usr/include/vxl/contrib/prip/vpyr/vpyr_2_pyramid_level_elts.h
/usr/include/vxl/contrib/prip/vpyr/vpyr_2_tpyramid.h
/usr/include/vxl/contrib/prip/vpyr/vpyr_2_tpyramid.txx
/usr/include/vxl/contrib/prip/vpyr/vpyr_2_tpyramid_base.h
/usr/include/vxl/contrib/prip/vpyr/vpyr_2_tpyramid_builder.h
/usr/include/vxl/contrib/prip/vpyr/vpyr_2_tpyramid_level.h
/usr/include/vxl/contrib/prip/vpyr/vpyr_2_tpyramid_level.txx
/usr/include/vxl/contrib/prip/vpyr/vpyr_2_tpyramid_level_elts.h
/usr/include/vxl/contrib/prip/vpyr/vpyr_top_tmap.h
/usr/include/vxl/contrib/prip/vpyr/vpyr_top_tmap.txx