these 3 derivations will be built:
  /nix/store/6ygm1yy06b5lfidvrfdci24d822jkz8b-iets-0.1.0.drv
  /nix/store/vkbj3i5qcrbwrfwgq67bb4qjfisy2k95-iets-conformance-adapter.drv
  /nix/store/qqhbcb3cx1v5w1q3gy444b1spklkhz38-nix-conformance-iets.drv