these 2 derivations will be built:
  /nix/store/f26v7m49lp1rqg1ch97c11kp5iglashf-iets-0.1.0.drv
  /nix/store/6z1ihqjgs5qnd0dkmb0vbzjqkrizfzrz-iets-diff-e2e.drv