these 3 derivations will be built:
  /nix/store/3dj5xric70bgjib8vj1b0lagj0gr3dak-source.drv
  /nix/store/k2i6i1k2qr77hh8fczrnbv7il6l6719l-deja-vu-0.24.1.drv
  /nix/store/xp17c4660m1wckjlfc6mn2jdg65crrkf-check-deja-vu.drv