You may well be right. In my first attempts, I did try various combinations of `--arg` and `--argstr`, but I never succeeded in getting a proper build. That's w

You may well be right. In my first attempts, I did try various combinations of `--arg` and `--argstr`, but I never succeeded in getting a proper build. That's why I ended up using the override approach instead. I understand a little bit more (very little!) about Nix now, so perhaps I should give it another try.