these 3 derivations will be built:
  /nix/store/dllczjgbh7y4m0hi8hjpbqap7r1szi4w-source.drv
  /nix/store/1rfsfdl3yqrd8jwhg68qfa57sp0y3l8v-harmonia-deps-3.3.0.drv
  /nix/store/r2a96aykh7ylcz607drjmrhqcdj0d2zj-harmonia-3.3.0.drv