these 3 derivations will be built:
  /nix/store/3222cfn8jzfh0zvjrah2sav71q2yvgfm-pi-src-with-lock.drv
  /nix/store/zk0n08hny02qxkywgham9sddkfk9svyx-pi-0.99.1.drv
  /nix/store/2yr76zqsv34jmw6dzbq7gbnf76aaxc5f-check-pi.drv