diff -r 1b3f5f603aef -r 16e5271b216f mercurial/hgweb/server.py
--- a/mercurial/hgweb/server.py	Mon Jul 25 15:38:10 2011 -0500
+++ b/mercurial/hgweb/server.py	Mon Jul 25 15:38:46 2011 -0500
@@ -248,7 +248,7 @@
     from threading import activeCount
     _mixin = SocketServer.ThreadingMixIn
 except ImportError:
-    if hasattr(os, "fork"):
+    if util.safehasattr(os, "fork"):
         _mixin = SocketServer.ForkingMixIn
     else:
         class _mixin(object):