these 3 derivations will be built:
  /nix/store/5076bv8i63zah3dagph8dkkycc0lv0bv-iets-0.1.0.drv
  /nix/store/gsk0jn6yn2bbmsxgn3d7ldc4z3nc8w3w-iets-conformance-adapter.drv
  /nix/store/ybdccvw978yc2zrqxjv3gnn0zkq6schj-nix-conformance-iets.drv