It now works for some older versions too. I'm still adding functionality. A better link is the one at Ingres HP: http://search.cpan.org/dist/DBD-Ingres/ . It always points to the most recent version. My goal is it to at least support DBI specs and some things like working with stored procedures (which actually works but lacks returning values, parameters by reference and row producing procedure support).
grant Thanks for the update - If you are feeling brave you could port the code to OpenAPI. That way you have a better chance to keep the driver in-line with Ingres.