these 4 derivations will be built:
  /nix/store/jds0ih4gjwawi661ij6ydgr7xabfjk90-source.drv
  /nix/store/2irjmb7w8p225ml7310jmrs4ay8rsy0z-but-0.22.1-vendor-staging.drv
  /nix/store/vk1wq6fhxflrlmsy325m5cpyi0q9b3m0-but-0.22.1-vendor.drv
  /nix/store/6il463jd0d4xmp856wqjhyppffqq1k5j-but-0.22.1.drv