Seems like there is a needed dependancy, yesod-default is needed on OSX.
Utility/Yesod.hs:10:8:
    Could not find module `Yesod.Default.Util'
    Use -v to see a list of the files searched for.
make: *** [git-annex] Error 1
> Only on OSX apparently. Weird. Added. [[done]] --[[Joey]]