these 2 derivations will be built:
  /nix/store/2lj92j1hv9y0wcyq2zn4fr5svlczhkvp-herdr-core-0.1.20.drv
  /nix/store/7zskzy6aq94sgjnidpwdlkydcqnxf1ml-check-herdr-core.drv