/usr/include/dune/grid/genericgeometry/ is in libdune-grid-dev 2.2.1-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/dune/grid/genericgeometry/cachedmapping.hh
/usr/include/dune/grid/genericgeometry/codimtable.hh
/usr/include/dune/grid/genericgeometry/conversion.hh
/usr/include/dune/grid/genericgeometry/cornermapping.hh
/usr/include/dune/grid/genericgeometry/genericreferenceelement.hh
/usr/include/dune/grid/genericgeometry/geometry.hh
/usr/include/dune/grid/genericgeometry/geometrytraits.hh
/usr/include/dune/grid/genericgeometry/hybridmapping.hh
/usr/include/dune/grid/genericgeometry/mapping.hh
/usr/include/dune/grid/genericgeometry/mappingprovider.hh
/usr/include/dune/grid/genericgeometry/matrixhelper.hh
/usr/include/dune/grid/genericgeometry/maximum.hh
/usr/include/dune/grid/genericgeometry/referencedomain.hh
/usr/include/dune/grid/genericgeometry/referenceelements.hh
/usr/include/dune/grid/genericgeometry/referencetopologies.hh
/usr/include/dune/grid/genericgeometry/subtopologies.hh
/usr/include/dune/grid/genericgeometry/topologytypes.hh
/usr/include/dune/grid/genericgeometry/traceprovider.hh