these 2 derivations will be built:
  /nix/store/rrxdj2dkra1mdj0mhxaajzbyqx1isv07-iets-0.1.0.drv
  /nix/store/9w2nh9x62qins9c08qr201s8q2b53qkx-iets-diff-e2e.drv