these 3 derivations will be built:
  /nix/store/xxvblsjksdg5hq6jvn6azh7iqpbdff49-freebuff-linux-x64.tar.gz.drv
  /nix/store/n48mvyrg5swxnbmd9km8bqmw7gqk64sb-freebuff-0.0.189.drv
  /nix/store/g8gdpadra2z010gwpxqy1zq3rhvyfh9g-check-freebuff.drv