Thread:Extension talk:LDAP Authentication/Can't Connect to AD - No Logging/reply

After posting this, it occurred to me that write permissions on the directory might be an issue. Of course it was, and I now have logs. This seems to be the issue:

2015-03-09 20:30:10 127.0.0.1 wiki: 2.1.0 It looks like you are missing LDAP support; please ensure you have either compiled LDAP support in, or have enabled the module. If the authentication is working for you, the plugin isn't properly detecting the LDAP module, and you can safely ignore this message.

What LDAP support am I missing?