these 3 derivations will be built:
  /nix/store/swi8am2chjhdckzyadq5kkibyyfsyv94-source.drv
  /nix/store/m302l2k8rx4ims3pp28jmj7lwwm0l2xx-fx-0.0.13.drv
  /nix/store/a8xljflh0spg546i4wls619mr4p2ni3v-check-fx.drv