title: Missing page numbers in the indicies of Doxygen generated PDF
body: <p>I'm using Doxygen 1.8.5 and I have an issue with the generated indicies (Module Index, Data Structure Index, File Index etc.).
  When I generate the PDF documentation with Doxygen extra indicies chapters &quot;Module Index&quot;, &quot;Data Structure Index&quot; and &quot;File Index&quot; are generated. Unfortunately the page numbers in that indicies are not generated correctly, so that a &quot;??&quot; is shown instead of the page number, similar like this:</p>
  <blockquote>
  <h1>Chapter 5</h1>
  <h2>File Index</h2>
  <h3>5.1 File List<br></h3>
  <p>Here is a list of all files with brief descriptions:<br><br>
  bar.c  Doxygen C-file Example . . . . . . . . . . . . . . . . . . . ??<br>
  bar.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ??<br>
  foo.c Doxygen C-file Example . . . . . . . . . . . . . . . . . . .  ??<br>
  foo.h Doxygen H-file Example . . . . . . . . . . . . . . . . . . .  ??<br></p>
  </blockquote>
  <p>Has anyone an idea what I'm doing wrong?</p>