these 2 derivations will be built:
  /nix/store/vljpn4d2bmx5hx2i40b16f2wf2c6z68w-iets-0.1.0.drv
  /nix/store/cfai7qsksgp5r12vz2hw2adyd8y64y1x-iets-diff-e2e.drv