these 4 derivations will be built:
  /nix/store/a4yrpnpb424wnyz7padqyajl6s0c7wg3-source.drv
  /nix/store/zsjk7vib2w4sy1svmq58fs38c7a1013i-aven-0.1.34-vendor-staging.drv
  /nix/store/g5irih4nvdry18h8n1v4ha0s6wd1knbj-aven-0.1.34-vendor.drv
  /nix/store/k5vhvj1abqpsy5z87n7qhyfy57kv9b08-aven-0.1.34.drv