these 3 derivations will be built:
  /nix/store/qz2pcg67nr1ps0cacd3ap2bqa1sgzyss-iets-0.1.0.drv
  /nix/store/9lsi8nx2zykgfff461vnjv3d5jwwrmvn-iets-conformance-adapter.drv
  /nix/store/d03p188fxnxqigcfvkgazr7wgvhhcjas-nix-conformance-iets.drv