these 2 derivations will be built:
  /nix/store/kys5mfw6m1d7yygh08lzdr8nndm8y517-iets-0.2.0.drv
  /nix/store/73lary7p6sdv5jjfvrx5ndq065sw3rp4-iets-classic-2.34.9.drv