title: Weasyprint font issue leads to all characters being replaced by boxes
body: <p>I've installed weasyprint using <code>pip install weasyprint</code>, which, in my understanding, should install the necessary dependencies.</p>
  
  <p>Somehow, the PDF output generated by weasyprint does not contain any fonts and all characters are replaced by boxes.</p>
  
  <p>When opening the document, I can see that no fonts are embedded. I can also reproduce the problem by entering <code>python -m weasyprint.navigator</code> in Terminal and accessing one of the example sites. Below is the wikipedia home page rendered by my weasyprint installation.</p>
  
  <p><a href="https://i.stack.imgur.com/NMd3T.png" rel="noreferrer"><img src="https://i.stack.imgur.com/NMd3T.png" alt="Wikipedia homepage rendered with weasyprint"></a></p>
  
  <p>What could be causing this problem and how could I go about solving it?</p>