these 3 derivations will be built:
  /nix/store/5941n4360c4r8q8d9772njn7i6rc7y4f-hol_guard-3.3.0.tar.gz.drv
  /nix/store/ywrxvrbagczdgxpahqc2p9maibngbp9d-hol-guard-3.3.0.drv
  /nix/store/x44vz6psfmgnn1d59fwfmv188xhfm2n1-check-hol-guard.drv