let dependency_graph ?(conjunctive=false) universe =
let gr = G.create () in
Cudf.iter_packages (fun pkg ->
G.add_vertex gr pkg;
List.iter (fun vpkgs ->
match CudfAdd.resolve_deps universe vpkgs with
|[p] -> G.add_edge gr pkg p
|l when not conjunctive -> List.iter (G.add_edge gr pkg) l
|_ -> ()
) pkg.Cudf.depends
) universe
;
gr