/usr/include/dolfin/geometry/ is in libdolfin-dev 2017.2.0.post0-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/dolfin/geometry/BoundingBoxTree.h
/usr/include/dolfin/geometry/BoundingBoxTree1D.h
/usr/include/dolfin/geometry/BoundingBoxTree2D.h
/usr/include/dolfin/geometry/BoundingBoxTree3D.h
/usr/include/dolfin/geometry/CGALExactArithmetic.h
/usr/include/dolfin/geometry/CollisionPredicates.h
/usr/include/dolfin/geometry/ConvexTriangulation.h
/usr/include/dolfin/geometry/GenericBoundingBoxTree.h
/usr/include/dolfin/geometry/GeometryDebugging.h
/usr/include/dolfin/geometry/GeometryPredicates.h
/usr/include/dolfin/geometry/IntersectionConstruction.h
/usr/include/dolfin/geometry/MeshPointIntersection.h
/usr/include/dolfin/geometry/Point.h
/usr/include/dolfin/geometry/SimplexQuadrature.h
/usr/include/dolfin/geometry/dolfin_geometry.h
/usr/include/dolfin/geometry/intersect.h
/usr/include/dolfin/geometry/predicates.h