{% if site.masthead_pages.size > 0 %}
  <ul class="nav">
    {% for page in site.masthead_pages %}
      {% assign site_page = site.pages | where: "path", page | first %}
      {% if site_page.title %}
        <li>
          <a href="{{ site_page.url | relative_url }}">{{ site_page.title | escape }}</a>
        </li>
      {% endif %}
    {% endfor %}
  </ul>
{% endif %}