How to setup LDAP authentication with WP multisite

I would like to set up my WP multisite install so that it will authenticate with our LDAP server. I had this working using the WPMU LDAP authentication plugin, but it no longer appears to be working with WP 3.9.1 and MySQL 5.3. Other plugins I’ve tried seem to call for the plugin to be configured on every site, and I would prefer for something to work over the entire network.

Can anyone explain how to go about setting up my WP multisite installation running WP 3.9.1 to authenticate over LDAP?

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