these 2 derivations will be built:
  /nix/store/v812g0awzqvxl96q9r2gxmj88a7bfa8v-iets-0.1.0.drv
  /nix/store/27z1siy7g5qf4j11vafivxgzrll6a700-iets-diff-e2e.drv