these 3 derivations will be built:
  /nix/store/4cqp6b2bf1zl4q9b96k3fq2dgh77yrhc-source.drv
  /nix/store/1xnm9m6dfjqfjxjkpmhd89snhayqdmkr-gnhf-0.1.51.drv
  /nix/store/29nh7ghkmiyg2vp343mh8sspahylak73-check-gnhf.drv