these 3 derivations will be built:
  /nix/store/nrhd49pi7xvxhg00gd9xclmfia7ki8cj-hol_guard-3.8.1.tar.gz.drv
  /nix/store/f1mfx9if81k1yxyxywij283qsfr7i5js-hol-guard-3.8.1.drv
  /nix/store/5kpv5hm24zi6i2lshc6ac8rz0kp9vzac-check-hol-guard.drv