/usr/include/vxl/contrib/mul/vimt3d/ is in libvxl1-dev 1.17.0.dfsg2-4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_add_all_loaders.h
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_crop.h
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_from_image_2d.h
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_fwd.h
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_gauss_reduce.h
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_gaussian_pyramid_builder_3d.h
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_gaussian_pyramid_builder_3d.txx
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_image_3d.h
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_image_3d_of.h
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_image_3d_of.txx
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_load.h
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_reconstruct_from_grid.h
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_reconstruct_from_grid.txx
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_reflect.h
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_resample_tricubic.h
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_resample_trilinear.h
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_sample_grid_trilin.h
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_sample_grid_trilin.txx
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_sample_profile_trilin.h
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_sample_transformed_blob.h
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_save.h
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_slice.h
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_transform_3d.h
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_trilin_interp.h
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_vil3d_v3i.h
/usr/include/vxl/contrib/mul/vimt3d/vimt3d_vil3d_v3m.h