these 2 derivations will be built:
  /nix/store/yppj0mij0lbinsn43n3rpdqqp6b9d55g-iets-deps-0.1.0.drv
  /nix/store/f9rnsvs6zfcybcs74bfnxccigzw3arnc-iets-examples-0.1.0.drv