these 3 derivations will be built:
  /nix/store/09q8p14pp6knqlchgm8l4hi7acv9svf5-source.drv
  /nix/store/ignwidqffijkq8vlirpkmnhx6ryzvihg-tribuchet-deps-0.1.0.drv
  /nix/store/l99sqc93p5sgcpymjf1pv8bf0mhmsykr-tribuchet-0.1.0.drv