these 3 derivations will be built:
  /nix/store/0fks3q7kv3gwlf6k0wiwsbp41gj49sbs-iets-0.1.0.drv
  /nix/store/5fqxm3xc5da7vn1bzpx30i84byksgjij-iets-conformance-adapter.drv
  /nix/store/2z5rpjkmd53kl56hrnkcm23cn4mkdvzi-nix-conformance-iets.drv