these 3 derivations will be built:
  /nix/store/mymw13xmh5smazv8c0i0c4a65y4xkvsn-pi-src-with-lock.drv
  /nix/store/66g9k61qgzwyy5c89vwg7chlg39rd25m-pi-0.99.2.drv
  /nix/store/vdbaja1hff91bq85dcvps1485sr5zh93-check-pi.drv