these 3 derivations will be built:
  /nix/store/frz2qbqryj6vpnlkj3f9bqii8jiy3xgj-hol_guard-3.12.0.tar.gz.drv
  /nix/store/dhfjzj5ympfr44sxlmzcq5ln6gpclgqp-hol-guard-3.12.0.drv
  /nix/store/zkx9md0qnip442awqhs5ss2pqpx3k8kq-check-hol-guard.drv