these 2 derivations will be built:
  /nix/store/r1nss2p7l3xn6fz1vi4az980pwx1yqlz-iets-0.1.0.drv
  /nix/store/k7sdna3m7hj12j69qk81dbrxwkk7mj91-iets-diff-e2e.drv