Index: project_faq.html
===================================================================
--- project_faq.html	(revision 8546)
+++ project_faq.html	(working copy)
@@ -97,7 +97,9 @@
     a "bad database version", that it found db-3.X, rather than
     db-4.X.</a></li>
 <li><a href="#redhat-db">I'm getting "Function not implemented" errors on
-    RedHat 9, and nothing works.  How do I fix this?</a></li>
+    RedHat 9 or Fedora Core 1, and nothing works.  How do I fix this?</a></li>
+<li><a href="#fedora-db">I'm getting "Invalid argument" errors on Fedora Core 1
+    using a Redhat NPTL kernel.  How do I fix this? 
 <li><a href="#no-author">Why does SVN log say "(no author)" for files
     committed or imported via Apache (ra_dav)?</a></li>
 <li><a href="#windows-access-denied">I'm getting occasional "Access Denied"
@@ -1312,6 +1314,34 @@
 
 <![CDATA[-----------------------------------------------------------]]>
 
+<h3><a name="fedora-db">I'm getting "Invalid argument" errors on Fedora Core 1
+using a Redhat NPTL kernel.  How do I fix this?</a></h3>
+
+<p>Like the <a href="#redhat-db">previous problem</a>, this one is related
+to RedHat/Fedora's NPTL enabled Berkeley DB.</p>
+
+<p>The Berkeley DB that RedHat provides for Fedora Core is supposed to enable
+an NPTL library for running on machines that support it and a non-NPTL
+library for those that don't.  However, there is a bug in the non-NPTL
+version that prevents proper working of subversion.  If your machine is
+attempting to use those, you'll see this:
+<blockquote><pre>
+svn: Berkeley DB error
+svn: Berkeley DB error while creating environment for filesystem tester/db:
+Invalid argument
+</pre></blockquote>
+This problem can occur if you are using a kernel without NPTL support, for
+which the solutions listed in <a href="#redhat-db">the previous problem</a>
+are options.  But they can also occur when you are running on an i[345]86 or
+certain clones (AMD K6, for instance).  In this case, only one fix has been
+reported:
+<ul>
+  <li>Rebuild db4 with --disable-posixmutex.</li>
+</ul>
+</p>
+
+<![CDATA[-----------------------------------------------------------]]>
+
 <h3><a name="no-author">Why does SVN log say "(no author)" for files
     committed or imported via Apache (ra_dav)?</a></h3>