these 3 derivations will be built:
  /nix/store/6arbgkcyr98dwwq29s8nnk5kw5q020yv-pi-src-with-lock.drv
  /nix/store/60qyy7rkx0bzlqbywvr3391c5by2y27h-pi-0.99.1.drv
  /nix/store/jpvs7f25c2hsm0hm9mhgq3av5h4ld231-check-pi.drv