[CentOS] Problems with mod_auth_ldap module

Just wondering if anyone's using the apache mod_auth_ldap module with 
require directives other than "valid-user"?

Reason for asking is that no matter what require statement (except 
valid-user) I try to use, apache logs "unknown require directive". 
According to the ldap logs it does lookup, and find, the user in question.

Any thoughts? Config error or bug?

Regards,
Harald
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