these 3 derivations will be built:
  /nix/store/c7cmbsafhciaiqnhx77avdsic9lhbq21-pi-src-with-lock.drv
  /nix/store/np93ymlnvswxd7rwr3qsvsh01v30n5l2-pi-0.99.2.drv
  /nix/store/nlivxvk3c25flrc2jbis6dg6jk22jjfc-check-pi.drv