these 3 derivations will be built:
  /nix/store/bx53zbllp9i0131fv931xml7djl5pahs-iets-0.1.0.drv
  /nix/store/yn6rg88vsf8iiiglmc9l47s54l857h5l-iets-conformance-adapter.drv
  /nix/store/0b81pq53hd1xgwy0zjm2nfdixbd985dv-nix-conformance-iets.drv