clever: thank you that makes sense! I ended up with this:
```
  imports = [
    (import /home/michael/cde/kde/nixpkgs/nixos/modules/services/ofono/default.nix {
      pkgs = pkgs // { ofono = (import /home/michael/cde/kde/nixpkgs {}).ofono; };
      inherit config;
      inherit lib;
    })
  ];
```
does that make sense or is there a more common convention?