I've just uploaded iftop 0.16. You can get it from:
http://ex-parrot.com/~pdw/iftop/download/iftop-0.16.tar.gz
Changes are:
0.16 28/02/04
* Added support for DLT_NULL
* Fix for pthread.c behaviour on Solaris.
* Build fixes for gcc 3.4+
Henne Vogelsang <hvogel(a)suse.de>
* Fixed behaviour of -n and -N options
Klaus Sperner <klaus(a)heaven.escape.de>
Paul