$ uname -a

 FreeBSD host 7.0-RELEASE-p7 FreeBSD 7.0-RELEASE-p7 #0: Sun Dec 21 12:33:45 UTC 2008     root@i386-builder.daemonology.net:/usr/obj/usr/src sys/GENERIC  i386

$ cd /usr/ports/net/socks5
$ sudo make install clean
$ socks5 -v

Socks5 version: Socks5 v1.0r11

$ cat /usr/local/etc/socks5.conf

set SOCKS5_BINDINTFC 10.0.0.1:1080
set SOCKS5_MAXCHILD 20
set SOCKS5_NOIDENT
set SOCKS5_TIMEOUT 5
interface 10.0.0.5 - ste0
interface 10.0.0.13 - ste0
auth 10.0.0.5 - n
auth 10.0.0.13 - n
permit - - 10.0.0.5 - - - -
permit - - 10.0.0.13 - - - -
deny - - - - - - -

$ sudo /usr/local/etc/rc.d/socks5 start
$ sudo vim /etc/syslog.conf:

!Socks5
*.*                                             /var/log/socks5.log

$ sudo touch /var/log/socks5.log
$ sudo /etc/rc.d/syslogd restart