these 2 derivations will be built:
  /nix/store/dyzsydhjfziq24mfp4a6qhzmajqh9drh-iets-0.1.0.drv
  /nix/store/nh1dcvryqbxr0bvv0dh8p5j3wka2jajc-iets-diff-e2e.drv