this derivation will be built:
  /nix/store/9wkjqz36yk3br1rhjpx9w5hv5f48wial-aven-0.1.21.drv
this path will be fetched (8.2 KiB download, 70.8 KiB unpacked):
  /nix/store/kyqpiwfhkh8jad3rbl27v98r7l18xw2x-libredirect-0