these 4 derivations will be built:
  /nix/store/sll10jdn1sql5zqjqc904c6jliv100zg-source.drv
  /nix/store/gg5w3p5nzgy0jyw81n81rwx1wpd1sh2m-aven-0.1.31-vendor-staging.drv
  /nix/store/cqm8lfbsaby95amqwv4nfzwnf553zc40-aven-0.1.31-vendor.drv
  /nix/store/x09l0fdv0yiz1g3q4dyzfnl5316w5862-aven-0.1.31.drv