Yesterday, I started work on a project to upgrade the BU CMS to version 3.1.x of WordPress. We follow the vendor branch setup for handling vendor drops as suggested in the Subversion book. Unfortunately, Mac OS X Snow Leopard (10.6.6) does not ship with the additional subversion tools installed, specifically svn_load_dirs.pl. After doing a bit of hunting, I came across a support document for Drupal that pointed me in the right direction.
1. Download the source code for svn_load_dirs.
svn co http://svn.apache.org/repos/asf/subversion/tags/1.6.6/contrib/client-side/svn_load_dirs svn_load_dirs
2. Move svn_load_dirs.pl.in to a bin directory and rename to svn_load_dirs.pl.
mv svn_load_dirs/svn_load_dirs.pl.in ~/bin/svn_load_dirs.pl
3. Because we will not be building subversion from source, we need to edit the script and replace
my $svn = '@SVN_BINDIR@/svn';
my $svn = '/usr/bin/svn';