Rake build file that should create an output directory

Rakefile

require 'rake'

HOME = "#{File.dirname(__FILE__)}"
DEST = "#{HOME}/output"

task :default => [:genoutputfolders]

task :genoutputfolders do
  directory "output"
  directory "#{DEST}"
  file "#{DEST}"      do |t| mkdir t.name end
end

# Rake -t -v
# (in /Users/mccm06/Documents/Temp/Scratch/samplerake)
# ** Invoke default (first_time)
# ** Invoke genoutputfolders (first_time)
# ** Execute genoutputfolders
# ** Execute default
#
# No directories are created on Mac OS 10.6.6 with Rake 0.8.7