/usr/include/dolfin/generation/ is in libdolfin-dev 1.4.0+dfsg-4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/dolfin/generation/BoxMesh.h
/usr/include/dolfin/generation/CGALMeshBuilder.h
/usr/include/dolfin/generation/CSGCGALDomain2D.h
/usr/include/dolfin/generation/CSGCGALMeshGenerator2D.h
/usr/include/dolfin/generation/CSGCGALMeshGenerator3D.h
/usr/include/dolfin/generation/CSGGeometries3D.h
/usr/include/dolfin/generation/CSGGeometry.h
/usr/include/dolfin/generation/CSGMeshGenerator.h
/usr/include/dolfin/generation/CSGOperators.h
/usr/include/dolfin/generation/CSGPrimitive.h
/usr/include/dolfin/generation/CSGPrimitives2D.h
/usr/include/dolfin/generation/CSGPrimitives3D.h
/usr/include/dolfin/generation/EllipseMesh.h
/usr/include/dolfin/generation/EllipsoidMesh.h
/usr/include/dolfin/generation/GeometryToCGALConverter.h
/usr/include/dolfin/generation/ImplicitDomainMeshGenerator.h
/usr/include/dolfin/generation/IntervalMesh.h
/usr/include/dolfin/generation/PolygonalMeshGenerator.h
/usr/include/dolfin/generation/PolyhedralMeshGenerator.h
/usr/include/dolfin/generation/PolyhedronUtils.h
/usr/include/dolfin/generation/RectangleMesh.h
/usr/include/dolfin/generation/Triangulate.h
/usr/include/dolfin/generation/UnitCubeMesh.h
/usr/include/dolfin/generation/UnitIntervalMesh.h
/usr/include/dolfin/generation/UnitSquareMesh.h
/usr/include/dolfin/generation/UnitTetrahedronMesh.h
/usr/include/dolfin/generation/UnitTriangleMesh.h
/usr/include/dolfin/generation/cgal_csg3d.h
/usr/include/dolfin/generation/cgal_triangulate_polyhedron.h
/usr/include/dolfin/generation/compute_normal.h
/usr/include/dolfin/generation/dolfin_generation.h
/usr/include/dolfin/generation/self_intersect.h