I have this as default.nix, then use a nix-env in which i run cargo build
```
let
  moz_overlay = import (builtins.fetchTarball https://github.com/mozilla/nixpkgs-mozilla/archive/master.tar.gz);
  nixpkgs = import <nixpkgs> { overlays = [ moz_overlay ]; };
  ruststable = (nixpkgs.latest.rustChannels.stable.rust.override { extensions = [ "rust-src" "rls-preview" "rust-analysis" "rustfmt-preview" ];});
in
  with nixpkgs;
  stdenv.mkDerivation {
    name = "rust";
    buildInputs = [ openssl pkg-config nasm rustup ruststable cmake zlib glib glibc libnice llvmPackages.libclang ];

    shellHook = ''
        export OPENSSL_DIR="${openssl.dev}"
        export OPENSSL_LIB_DIR="${openssl.out}/lib"
        export LIBCLANG_PATH="${llvmPackages.libclang}/lib"
        export LD_LIBRARY_PATH="${libnice.dev}/include"
    '';
  }
```