Trying to configure Collabnet to authenticate using LDAP following the guideline at http://blogs.collab.net/subversion/subversion_ldap.
Got the error:
Invalid command 'AuthLDAPAuthoritative', perhaps misspelled or defined by a module not included in...Fixed by reading this blog post sleeplessmonkey./../joys-of-apache-webserver-and-modules
Switch AuthLDAPAuthoritative to AuthzLDAPAuthoritative, problem solved.