title: Diagnosing R package build warning: "LaTeX errors when creating PDF version"
body: <p>When building a package, I received the following warning:</p>
  
  <pre><code>* checking PDF version of manual ... WARNING
  LaTeX errors when creating PDF version.
  This typically indicates Rd problems.
  </code></pre>
  
  <p>I have no idea how to even begin diagnosing this.  Is there a tool that tells me what .Rd file the problem is in?</p>
  
  <p>I get no warnings about any of my Rd files in the checking documentation step....</p>