these 3 derivations will be built:
  /nix/store/fpq0brgffhi9kvmapkg8al8nxxnhmwrb-droid.drv
  /nix/store/fs1yw8yjmv3ivavlvhpys3v6ly39k3d8-droid-1.0.0.drv
  /nix/store/cvaw6ypnsn6fdkn14aanycq6zq3aahqd-check-droid.drv