[SQU] cache_dns_program is not working ?

I want to use cache_dns_program, but when I uncomment
the
line cache_dns_program /usr/local/squid/bin/dnsserver
and try to start, squid print the message:
parseConfigFile: line 612 unrecognized:
'cache_dns_program /us
r/local/squid/bin/dnsserver'
Is it OK?
the version is 2.3STABLE4
Slackware kernel 2.2.16
thanks in advance
Jordan

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