Note that the filesystem library should be built.

[SVN r18603]

more/download.html

@@ -133,8 +133,9 @@
     command line of most compilers is sufficient.</p>
 
     <p>The <a href="../libs/python/doc/index.html">Python</a>, <a href=
-    "../libs/regex/index.htm">Regex</a>, and <a href=
-    "../libs/thread/doc/index.html">Threads</a> libraries are implemented in
+    "../libs/regex/index.htm">Regex</a>, <a href=
+    "../libs/thread/doc/index.html">Threads</a> and <a href=
+    "../libs/filesystem/doc/index.htm">Filesystem</a> libraries are implemented in
     part as separate source files, and thus require compilation before use.
     See <a href="../tools/build/index.html">Building Boost Libraries</a> for
     an automatic tool to prepare such libraries. Some of the individual