these 4 derivations will be built:
  /nix/store/z477jiv8z5ndbp1196ykxrkqz625mwji-source.drv
  /nix/store/bq45hbijag9g7w9vn9iayylahg63j0fm-but-0.22.1-vendor-staging.drv
  /nix/store/y29piqg51vcccclyn4zd493ibpbr5ycn-but-0.22.1-vendor.drv
  /nix/store/1qwvvl1kxy3h5gcv0if3h5sjxfzwx6z8-but-0.22.1.drv