Mention libevent in more docs.

svn:r3913

INSTALL

 Quickstart version for users:
 
+-1) If you don't have libevent, install it.  Source is at
+    http://www.monkey.org/~provos/libevent/ .
 0) Download the absolute newest version. No, really.
   http://tor.eff.org/dist/
 1) tar xvf it, and then cd into the directory.
@@ -42,6 +44,10 @@ If you got the source from cvs:
 
 If the quickstart doesn't work for you:
 
+  Starting with Tor 0.1.0.0, Tor uses libevent for its asynchronous
+  networking core.  If you don't have libevent, you'll need to install it.
+  You can get it at http://www.monkey.org/~provos/libevent/.
+
   If you have problems finding libraries, try
     CPPFLAGS="-I/usr/local/include" LDFLAGS="-L/usr/local/lib" \
     ./configure

configure.in

@@ -34,7 +34,7 @@ AC_SEARCH_LIBS(socket, [socket])
 AC_SEARCH_LIBS(gethostbyname, [nsl])
 AC_SEARCH_LIBS(pthread_create, [pthread])
 AC_SEARCH_LIBS(pthread_detach, [pthread])
-AC_SEARCH_LIBS(event_loop, [event], , AC_MSG_ERROR(Libevent library not found. Tor requires libevent to build.))
+AC_SEARCH_LIBS(event_loop, [event], , AC_MSG_ERROR(Libevent library not found. Tor requires libevent to build.  You can get the latest version of libevent at http://www.monkey.org/~provos/libevent/ ))
 
 saved_LIBS="$LIBS"
 saved_LDFLAGS="$LDFLAGS"

doc/tor-doc.html

@@ -173,6 +173,11 @@ package</a>), these steps are already done for you, and you may
 even already have Tor started in the background (logging to
 /var/log/something).</p>
 
+<p><b>For newer releases</b>: To build Tor version 0.1.0.1-rc or later from
+source, you will need Niels Provos's <tt>libevent</tt> library; you can get
+the source for the latest version
+<a href="http://www.monkey.org/~provos/libevent/">here</a></a>
+
 <p>In any case, see the <a href="#client">next section</a> for what to
 <i>do</i> with it now that you've got it running.</p>