these 2 derivations will be built:
  /nix/store/d4lj9scyq4zgcx8axzg76hlk5chrxpf8-iets-0.1.0.drv
  /nix/store/bpvf7q9zg0jlmd27ia154vgw460x4plb-iets-diff-e2e.drv