these 3 derivations will be built:
  /nix/store/qck5w6475pm26m1kl36zni633nvxc785-iets-0.1.0.drv
  /nix/store/9blpza784q8gazg6zh441aa08gai0r77-iets-conformance-adapter.drv
  /nix/store/bjdig1k94qacvcndj927lwj6a5rajvh6-nix-conformance-iets.drv