these 3 derivations will be built:
  /nix/store/fcmgc4aafn84mlcxjhb7mlyz3z3kih2w-iets-0.1.0.drv
  /nix/store/cpwzhld5n702ff286hihhgnj3g755s1v-iets-conformance-adapter.drv
  /nix/store/9p42s545zi7w3apd9wgb9knb9lai2r0a-nix-conformance-iets.drv