these 3 derivations will be built:
  /nix/store/3bwgxdyj4vs6jkhjsrikvqsfm0hksqhq-source.drv
  /nix/store/n797iw7dmbp4wc2pil2050gpc8wdcp06-horae-deps-0.1.0.drv
  /nix/store/m3791wnss086k1fv963q8sx81mp6lhgr-horae-0.1.0.drv