Postfix Dovecot unix Error : missing '=' after attribute

According to multiple documents like http://ift.tt/1B8JldG

One of the configuration lines is:

    dovecot   unix  -       n       n       -       -       pipe
  flags=DRhu user=mail:mail argv=/usr/lib/dovecot/deliver -f ${sender} -d ${user}

By putting the above in /etc/postfix/main.cf I get the following error:

postmulti: fatal: /etc/postfix/main.cf, line 69-70: missing '=' after attribute name: "dovecot unix - n n - - pipe flags=DRhu user=vmail:vmail argv=/usr/lib/dovecot/deliver -f ${sender} -d ${recipient}

Am assuming this is a whitespace issue and the same issue has been reported multiple times, but no clear solution/reason is provided.