OS X Installation Error

edit

I am attempting to install ROS on OS X Lion. I've used ROS a lot in Linux but would like to be able to run ros distributed onto a Mac. I am getting stuck on step 1.6 with a "python-svn could not be imported" error. I have already attempted to install python-svn using pip, homebrew as well as an independent package I found online. Not sure what to do.

rosinstall ~/ros "http://packages.ros.org/cgi-bin/gen_rosinstall.py?rosdistro=electric&variant=desktop-full&overlay=no"

Traceback (most recent call last):
  File "/usr/local/bin/rosinstall", line 5, in <module>
    pkg_resources.run_script('rosinstall==0.5.30', 'rosinstall')
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 489, in run_script
    self.require(requires)[0].run_script(script_name, ns)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 1214, in run_script
    exec script_code in namespace, namespace
  File "/Library/Python/2.7/site-packages/rosinstall-0.5.30-py2.7.egg/EGG-INFO/scripts/rosinstall", line 781, in <module>

  File "/Library/Python/2.7/site-packages/rosinstall-0.5.30-py2.7.egg/EGG-INFO/scripts/rosinstall", line 703, in rosinstall_main

  File "/Library/Python/2.7/site-packages/rosinstall-0.5.30-py2.7.egg/EGG-INFO/scripts/rosinstall", line 234, in __init__

  File "/Library/Python/2.7/site-packages/rosinstall-0.5.30-py2.7.egg/EGG-INFO/scripts/rosinstall", line 283, in load_yaml

  File "/Library/Python/2.7/site-packages/rosinstall-0.5.30-py2.7.egg/EGG-INFO/scripts/rosinstall", line 223, in __init__

  File "build/bdist.macosx-10.7-intel/egg/vcstools/vcs_abstraction.py", line 51, in __init__
  File "build/bdist.macosx-10.7-intel/egg/vcstools/svn.py", line 66, in __init__
vcstools.vcs_base.VcsError: 'python-svn could not be imported. Please install python-svn. On debian systems sudo apt-get install python-svn'

Thanks!