these 3 derivations will be built:
  /nix/store/0gzh3zawshmlbidmqwjzvj1pflidbvgc-source.drv
  /nix/store/h02ngpn9x9irlcqh7akkcdzzfvycwrxv-fx-0.0.12.drv
  /nix/store/vz1ri3yzqg47x3ml3b08q1klaxzfy4ij-check-fx.drv