these 3 derivations will be built:
  /nix/store/dqf0cxa4vbc5f8cqgd9xahfpr4r4aipw-hol_guard-3.4.2.tar.gz.drv
  /nix/store/fqrnpbfil79j272ql3faqc8np0di6wvn-hol-guard-3.4.2.drv
  /nix/store/6rcm6668znf6i0yianzq04nbjdi6akki-check-hol-guard.drv