Authenticate users via LDAP using nginx

I know how to auth the users via LDAP in apache2: # put the following in the VirtualHost ServerAdmin user1@bar.foo.com DocumentRoot /var/www AuthType Basic AuthName "Please provide USERNAME AND PASSWORD" AuthBasicProvider ldap Order allow,deny Allow from all AuthLDAPURL "ldaps://ehh.foo.com/ou=ehh,o=foo.com?mail" Require valid-user Require ldap-attribute emailAddress=someuser@bar.foo.com **Q:** But we need to use nginx. How can we configure nginx to auth via LDAP? Using Ubuntu 12.04.5