these 3 derivations will be built:
  /nix/store/dk767d2cjiazqs6pgwigiq3bx0rrx186-source.drv
  /nix/store/2wv95q8hvwryyv8lhsplrix07y33pzfq-fx-0.0.16.drv
  /nix/store/3kskshrif30bc5fqb6sawj051ki5y3pj-check-fx.drv