these 3 derivations will be built:
  /nix/store/9mgdpisqm6nyv0mwa7g1gwpb5j885ki3-source.drv
  /nix/store/4d34k72ip7lrw4h7m9bm3fcc2kap0sg2-gno-2.9.1.drv
  /nix/store/pv5bn7ca8wpknir712i4jij5wj4qaiap-check-gno.drv