these 3 derivations will be built:
  /nix/store/lp4c7r8wjyafipf34hf7l6v22hdjnkzg-freebuff-linux-x64.tar.gz.drv
  /nix/store/j0b8pxc1606vxfjb96mr1pg9876xdz7r-freebuff-0.1.2.drv
  /nix/store/d33mz6iyf38irxgwqylmyd13ilh527yv-check-freebuff.drv