/usr/include/vxl/contrib/oul/ is in libvxl1-dev 1.17.0.dfsg2-4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/vxl/contrib/oul/ouel/
/usr/include/vxl/contrib/oul/ouel/kalman_filter.h
/usr/include/vxl/contrib/oul/oul_copyright.h
/usr/include/vxl/contrib/oul/ouml/
/usr/include/vxl/contrib/oul/ouml/CardinalSpline.h
/usr/include/vxl/contrib/oul/ouml/eigenfaces.h
/usr/include/vxl/contrib/oul/ouml/image_convert.h
/usr/include/vxl/contrib/oul/ouml/image_convert.txx
/usr/include/vxl/contrib/oul/ouml/image_database.h
/usr/include/vxl/contrib/oul/ouml/image_ops.h
/usr/include/vxl/contrib/oul/ouml/image_ops.txx
/usr/include/vxl/contrib/oul/ouml/inlines.h
/usr/include/vxl/contrib/oul/ouml/io.h
/usr/include/vxl/contrib/oul/ouml/io.txx
/usr/include/vxl/contrib/oul/ouml/polygon_mesh.h