these 2 derivations will be built:
  /nix/store/w30l3zhfaqsm0fjcagyaqpcwdd15drl0-mardi-gras-0.33.0.drv
  /nix/store/1qcnzk0ssgqhg75sm671kp6xwqz34wm3-check-mardi-gras.drv