title: Compilation of contract with include
body: <p>I’m currently struggling to compile a contract (on aeternity's Sophia language) with include of a custom library “Library.aes” which resides in a separate file at the same level of the filesystem as the using contract.</p>
  <p>The library looks like</p>
  <pre><code>namespace Library =
    type number = int
    function inc(x : number) : number = x + 1
  </code></pre>
  <p>The contract is using it like this</p>
  <pre><code>include &quot;Library.aes&quot;
  </code></pre>
  <p>When I compile (locally using compiler node) the contract, I always get</p>
  <pre><code>&quot;Couldn't find include file 'Library.aes'\n&quot;
  </code></pre>
  <p>also tried to pass the full path to the include, same result.</p>
  <p>Is there a need to define the attribute options.file_system somehow?</p>