sendmail.mc entry for "spamc" milter

[Dr Robert Young]

In my initial foray into Spamassassin (2.63 to start, V3 later), I am 
trying to get the spamc component linking sendmail and spamd to work. I 
have verified that the spamc->spamd  is working by running it manually 
on the command line. I have sendmail compiled with -DMILTER, but I seem 
to be having a problem getting sendmail to "startup" spamc when needed.

Does anyone have a sample INPUT_MAIL_FILTER line from their 'working' 
sendmail config file(sendmail.mc) so I can check the syntax I am using? 
I was planning on using a unix socket file since I have that currently 
working from the command line.