I'm writing a driver lib and I'm  trying to avoid this:
```
cargo tree -p rf24_node | grep "nix"
│   │   └── nix v0.27.1
│   ├── nix v0.27.1 (*)
│   │   ├── nix v0.26.4
│       └── nix v0.26.4 (*)
├── nix v0.29.0
```