elixir.nix

{ mkDerivation }:

mkDerivation rec {
  version = "1.7.2";

  # nixnix-prefetch-url --unpack https://github.com/elixir-lang/elixir/archive/v1.7.2.tar.gz
  sha256 = "0wnrx6wlpmr23ypm8za0c4dl952nj4rjylcsdzz0xrma92ylrqfq";
  minimumOTPVersion = "18";
}

erlang.nix

{ mkDerivation, fetchurl }:

mkDerivation rec {
  version = "21.0.5";
  # nix-prefetch-url --unpack https://github.com/erlang/otp/archive/OTP-21.0.5.tar.gz
  sha256 = "08bw8zl1w0s47rsy52ryx0hgxacw37a39k5m20p8mfrvflkaqip7";

  prePatch = ''
    substituteInPlace configure.in --replace '`sw_vers -productVersion`' '10.10'
  '';
}

shell.nix

{ pkgs ? import <nixpkgs> { } }: let

  erlang = pkgs.beam.lib.callErlang ./erlang.nix {
    wxGTK = pkgs.wxGTK30;
  };
  elixir = pkgs.beam.lib.callElixir ./elixir.nix {
    inherit erlang;
    debugInfo = true;
  };

in pkgs.stdenv.mkDerivation {
  name = "my_elixir_project";
  version = "0.1.0";
  buildInputs = [
    erlang
    elixir
  ];
}