{ pkgs ? import <nixpkgs> {} }:

let
  enacl = pkgs.stdenv.mkDerivation {
    pname = "enacl";
    version = "0.0.1";
    src = pkgs.fetchFromGitHub {
      owner = "amdolan";
      repo = "enacl";
      rev = "v0.0.3";
      sha256 = "sha256-RSJhLUHtKqvq4eyfB7z2LHCDWR1N119dfRHThrmcRn8=";
    };

    nativeBuildInputs = [ pkgs.rebar3 pkgs.gcc pkgs.gnumake pkgs.pkg-config ];
    buildInputs = [ pkgs.libsodium pkgs.libsodium.dev ];

    buildPhase = ''
      export REBAR_CACHE_DIR=$PWD/.rebar3_cache
      mkdir -p $REBAR_CACHE_DIR
      rebar3 compile
    '';

    installPhase = ''
      mkdir -p $out/lib/enacl
      cp -r _build/default/lib/enacl/ebin $out/lib/enacl/
      cp -r priv $out/lib/enacl/
    '';
  };
in

pkgs.mkShell {
  buildInputs = [
    pkgs.erlang
    pkgs.rebar3
    pkgs.libsodium
    pkgs.gcc
    pkgs.gnumake
    pkgs.pkg-config
    enacl
  ];

  shellHook = ''
    export CHUMAK_CURVE_LIB=enacl
    export ERL_LIBS=$ERL_LIBS:${enacl}/lib
    echo "Nix environment with Erlang, Rebar3, enacl, and Libsodium is ready!"
  '';
}

Failures:

  1) chumak_acceptance_error_handler_curve:-wrong_key/1-fun-1-/0:80
     Failure/Error: ?assertMatch({ server_error , { error , closed } }, Message)
       expected: = { server_error , { error , closed } }
            got: {server_error,closed}
     %% eunit_proc.erl:583:in `eunit_proc:run_group/2`
     Output:
     Output:
  2) chumak_iron_house_test:-negotiate_messages/1-fun-1-/0:83
     Failure/Error: ?assertEqual({server_error,{error,closed}}, Message)
       expected: {server_error,{error,closed}}
            got: {server_error,closed}
     %% eunit_proc.erl:583:in `eunit_proc:run_group/2`
     Output:
     Output:

Finished in 7.725 seconds
140 tests, 2 failures
===> Error running tests