these 3 derivations will be built:
  /nix/store/3bwgxdyj4vs6jkhjsrikvqsfm0hksqhq-source.drv
  /nix/store/3wzrx4nq918gwmvr5bm8jxwjzhg39vc7-horae-checks-deps-0.1.0.drv
  /nix/store/93f2z6zfbla449bv3d5rjzk1khl8lsl8-horae-tests-0.1.0.drv