these 4 derivations will be built:
  /nix/store/v44razc60kmc8a4qp9ylq5dxxdrps1sz-source.drv
  /nix/store/pm608fvjnqa2fmjga7076i0zxavbjxgm-aven-0.1.19-vendor-staging.drv
  /nix/store/kv84lkw8f1nnpxdr2ldgi6lkb7l6z6r6-aven-0.1.19-vendor.drv
  /nix/store/zhsfingimn4mml3fckif7fij4vqzj5cd-aven-0.1.19.drv