(or pkgsrc) from the 00DIST file:
4.71 March 11, 2004
...
Added process_kqueue() function prototypes for FreeBSD,
NetBSD and OpenBSD.
...
Added support for the optional reporting of socket
options, socket states and TCP flags for most currently
supported dialects. John Smith <lbalbalba@hotmail.com>
and Tristan Nefzger <tn@bhtrader.com> requested the
information. The dialects and their versions for which
this feature has become available include:
AIX 4.3.2 and 5.[12]
Apple Darwin 7.2
BSDI BSD/OS 4.3.1
Digital UNIX and Tru64 UNIX 4.0
FreeBSD 4.9 and 5.2
HP-UX 11 and 11.11 (aka 11i)
NetBSD 1.6ZH
OpenBSD 3.4
OPENSTEP 4.2
OpenUNIX 8
Solaris 2.6, 8, 9 and 10
UnixWare 7.1.[134]
81f3f21257