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Don't forget to create /usr/local/etc/frox.conf.
See an example in /usr/local/share/examples/frox/frox.conf

You can use frox by two ways:
1) run as a daemon:
Add `frox_enable="YES"' in /etc/rc.conf and run /usr/local/etc/rc.d/frox.sh

2) run frox with inetd(8):
* uncomment 'FromInetd yes' in your /usr/local/etc/frox.conf
* add a line in /etc/inetd.conf:
frox     stream  tcp     nowait  nobody    /usr/local/sbin/frox    frox
* assign a port number for frox inside /etc/services (e.g. 2121):
frox	2121/tcp
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