these 3 derivations will be built:
  /nix/store/gi4mxki6vbv4yywx8047g2ihd9x1wk8n-source.drv
  /nix/store/45fhbl1nxfzlfayfa2g79rgz64a8gc6i-horae-checks-deps-0.1.0.drv
  /nix/store/9k0b2m0m1jc4ajh00cxhm0hlgc41r1bf-horae-tests-0.1.0.drv