these 2 derivations will be built:
  /nix/store/yppj0mij0lbinsn43n3rpdqqp6b9d55g-iets-deps-0.1.0.drv
  /nix/store/c6j2qrxixrdmnmzi4rps9imjb1ns0dzw-iets-doc-0.1.0.drv