these 2 derivations will be built:
  /nix/store/4kcbp1k2j8mph3hmarg2lnnjcg4z1yy5-iets-0.1.0.drv
  /nix/store/r8w2h9plk4wvf69bm9ynd3jvviy44gdg-iets-diff-e2e.drv