The ntop does not operate.

[anfojp@…]

$ sudo port install libevent
--->  Fetching archive for libevent
--->  Attempting to fetch libevent-2.0.16_0.darwin_10.x86_64.tbz2 from http://packages.macports.org/libevent
--->  Attempting to fetch libevent-2.0.16_0.darwin_10.x86_64.tbz2.rmd160 from http://packages.macports.org/libevent
--->  Installing libevent @2.0.16_0
--->  Activating libevent @2.0.16_0
--->  Cleaning libevent

$ sudo ntop -i en0
Mon Feb 13 16:36:51 2012  NOTE: Interface merge enabled by default
Mon Feb 13 16:36:51 2012  Initializing gdbm databases
Mon Feb 13 16:36:51 2012  ntop will be started as user nobody
Mon Feb 13 16:36:51 2012  ntop v.3.3.10
Mon Feb 13 16:36:51 2012  Configured on Jan 11 2012 15:59:47, built on Jan 11 2012 15:59:56.
Mon Feb 13 16:36:51 2012  Copyright 1998-2009 by Luca Deri <deri@ntop.org>
Mon Feb 13 16:36:51 2012  Get the freshest ntop from http://www.ntop.org/
Mon Feb 13 16:36:51 2012  NOTE: ntop is running from '/opt/local/bin'
Mon Feb 13 16:36:51 2012  NOTE: (but see warning on man page for the --instance parameter)
Mon Feb 13 16:36:51 2012  NOTE: ntop libraries are in '/opt/local/lib'
Mon Feb 13 16:36:51 2012  Initializing ntop
Mon Feb 13 16:36:51 2012  **ERROR** You are using libevent 14751416 whereas ntop needs at least v1.4
Mon Feb 13 16:36:51 2012  **ERROR** Due to a libevent bug with IPv6 address resolution
Mon Feb 13 16:36:51 2012  **ERROR** See http://www.mail-archive.com/debian-bugs-dist@lists.debian.org/msg408382.html
Mon Feb 13 16:36:51 2012  **ERROR** Please rebuild ntop against a newer libevent version

[ryandesign (Ryan Carsten Schmidt)]

Duplicate of #28457.

Please try the patch in #31330. Let us know there whether or not it works.