flake.nix

{
   description = "Nerves build environment";

  inputs = {
     nixpkgs = { url = "github:NixOS/nixpkgs/nixos-22.11"; };
    flake-utils = { url = "github:numtide/flake-utils"; };
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        inherit (nixpkgs.lib) optional;
        pkgs = import nixpkgs { inherit system; };

        # Set the Erlang version
        erlangVersion = "erlangR25";
        # Set the Elixir version
        elixirVersion = "elixir_1_14";

        erlang = pkgs.beam.interpreters.${erlangVersion};
        elixir = pkgs.beam.packages.${erlangVersion}.${elixirVersion};
        elixir_ls = pkgs.beam.packages.${erlangVersion}.elixir_ls;

        libPath = with pkgs; lib.makeLibraryPath [
           pkgs.stdenv.cc.cc 
        ]; 


      in
      {
          devShell = with pkgs; mkShell
          {
              buildInputs = [
                elixir
                pkgs.autoconf
                pkgs.automake
                pkgs.curl
                pkgs.fwup
                pkgs.git
                pkgs.rebar3
                pkgs.squashfsTools
                pkgs.x11_ssh_askpass
                pkgs.pkg-config
            ];
            NIX_LD_LIBRARY_PATH = libPath;
            NIX_LD = lib.fileContents "${pkgs.stdenv.cc}/nix-support/dynamic-linker";
          };
      }
    );
}

Does require use flake . --impure but works on the nerves blinky example.

Also requires programs.nix-ld.enable = true; in configuration.nix