title: where to place my erlang library module myerlib.erl into elixir tree directory for calling from elixir modules
body: <p>I have myerlib/src/myerlib.erl erlang library module and I need call its functions from Elixir modules.
  Too call myerlib module functions from elixir code I could write :myerlib.function(.....) but </p>
  
  <p>If I put myerlib subrirectory under deps/ elixir directory and use mix.exs:</p>
  
  <pre><code>def deps do
    [
      {:myerlib, path: "deps/myerlib"}
      # ...
    ]
  end
  </code></pre>
  
  <p>then when I do <code>iex -S mix</code> I get this error:</p>
  
  <blockquote>
    <p>*** (Mix) :path option can only be used with mix projects, invalid path dependency for :myerlib</p>
  </blockquote>