npub1eqghrdelwyf920kghgwlmkjve6ptgnjy3jzkpfvxjmmjsh4em83sq6fncn (npub1eqg…fncn) well, you use the source as the as the source of the package, build it and then copy the binary.
Take a look here:
https://github.com/NixOS/nixpkgs/blob/master/doc/languages-frameworks/rust.section.md