these 3 derivations will be built:
  /nix/store/xp6i3ik847krfhxx1ykfqk8aimi39cj3-source.drv
  /nix/store/l852z5qw0fd842w6my3h1w13i0jlpfyk-herdr-eternal-deps-0.1.0.drv
  /nix/store/wq1kvzn02i595hq3mdcvfbj2kjh5jf5r-herdr-eternal-0.1.0.drv