these 2 derivations will be built:
  /nix/store/mwk1q7516sv5lacniawfwjkgf42ksbdv-horae-checks-deps-0.1.0.drv
  /nix/store/nxjlqnmqx68z53gc51sp8ak0w2w8n19l-horae-tests-0.1.0.drv