mtr unable to get raw sockets – mac os x

$ mtr yahoo.com
mtr: unable to get raw sockets.

$ sudo chmod 4755 /usr/local/sbin/mtr

$ sudo chown root:wheel /usr/local/sbin/mtr
$ sudo chmod u+s /usr/local/sbin/mtr

create file
$ vi ~/.bash_profile

alias mtr=/usr/local/sbin/mtr

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