these 2 derivations will be built:
  /nix/store/z5njqy0zvirpg5idp71w9pvli33s6fqm-iets-0.1.0.drv
  /nix/store/qzz2gw72dzzj9hddvqbqvbarzgwj56qv-iets-diff-e2e.drv