[exim] exim-4.63 + clamav-0.88.4

Any dudes here can provide a guide for adding clamav scanning into exim?
I already got exim running.
Currently, I am getting this error when i restart the service of exim
Starting sendmail: 2006-08-10 16:33:33 Exim configuration error in line 53
of /usr/exim/configure:
main option "av_scanner" unknown

Help need!...thanks all!
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