title: error trying to exec 'as': execvp: No such file or directory
body: <p>When trying to build I get this error:</p>
  
  <pre class="lang-none prettyprint-override"><code>$ make CC=i686-w64-mingw32-gcc
    CC    aes.c
  i686-w64-mingw32-gcc: error trying to exec 'as': execvp: No such file or directory
  </code></pre>