Scheduled build always say build not required

Hi, I'm am using Anthill with the SubversionRepositoryAdapter.  Whenever 
my scheduled builds run it tells me that a build is not required, even 
when I have two minutes before commited updates to my repository.  I've 
been following the list so I know from recent emails that there is no 
way to force a scheduled build.  What I am wondering is how Anthill 
determines whether or not a build is necessary.  Perhaps I don't have my 
repository set up correctly for Anthill to detect my changes.  Thanks, 
Philip.