/usr/include/dune/pdelab/ordering/ is in libdune-pdelab-dev 2.5.0~20170124g7cf9f47a-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/dune/pdelab/ordering/chunkedblockordering.hh
/usr/include/dune/pdelab/ordering/decorator.hh
/usr/include/dune/pdelab/ordering/directleaflocalordering.hh
/usr/include/dune/pdelab/ordering/entityblockedlocalordering.hh
/usr/include/dune/pdelab/ordering/gridviewordering.hh
/usr/include/dune/pdelab/ordering/interleavedordering.hh
/usr/include/dune/pdelab/ordering/leafgridviewordering.hh
/usr/include/dune/pdelab/ordering/leaflocalordering.hh
/usr/include/dune/pdelab/ordering/leaforderingbase.hh
/usr/include/dune/pdelab/ordering/lexicographicordering.hh
/usr/include/dune/pdelab/ordering/localorderingbase.hh
/usr/include/dune/pdelab/ordering/orderingbase.hh
/usr/include/dune/pdelab/ordering/permutedordering.hh
/usr/include/dune/pdelab/ordering/singlecodimleafordering.hh
/usr/include/dune/pdelab/ordering/subordering.hh
/usr/include/dune/pdelab/ordering/transformations.hh
/usr/include/dune/pdelab/ordering/utility.hh