max allowed packets on Mac

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Hi,

I found this page on the wiki regarding max allowed packets.
http://dev.mysql.com/doc/refman/5.0/en/packet-too-large.html


However, on my Mac OSX when I try to run the following from terminal window 
I get "Permission Denied"

shell> mysqld --max_allowed_packet=16M

And if I try to run as sudo but I again get "Permission Denied" even though 
I am logged in as Admin on my machine.

So I tried to chmod 777 on mysqld but again received an error:

"chmod: Unable to change file mode on mysqld: Operation not permitted"

Any help on how I can rectify this would be appreciated.

Thanks,
Greg