Recursive chmod in custom addon

I've been creating a custom addon for the TYPO3 CMS and as part of its install I need perform a recursive chmod on several directories.

From the cpAddOn documentation, it looks like adding the following entries in the meta_info reference table should do the trick...

Code:

	
chmod_recursively => 1,
chmod => {
  '0777' => [qw(typo3conf/ typo3temp/ uploads/ fileadmin/)],
},

When I run the installer, however, only the top level directories are chmodded correctly and there is no recursion into subdirectories.

Any suggestions on what I might be missing or anyone who has a recursive chmod working correctly? It seems that none of the default add ons use this feature.

Thanks,
Jeff