these 2 derivations will be built:
  /nix/store/1nyyyj7la2x5rd8s7jscbyw6xjyrzhqs-aven-0.1.21-vendor.drv
  /nix/store/hzwg03rqsprqbv7yk1439pv5m40rhzyy-aven-0.1.21.drv
this path will be fetched (7.8 KiB download, 29.8 KiB unpacked):
  /nix/store/ib5bxqv4n9ch7ksc02cp6wwgvw23d9fw-libredirect-0