rosinstall (electric) fails on Mac OS X 10.6.7

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Hello,

I am trying to install ROS on Mac OS X Snow Leopard. I am getting this error message, when trying to install the ros base (or any other configuration) e.g. by executing rosinstall ~/ros "http://packages.ros.org/cgi-bin/gen_rosinstall.py?rosdistro=electric&variant=ros-base&overlay=no"

Bootstrapping ROS build
Detected ros_comm bootstrapping it too.
Rospack failed to build
Traceback (most recent call last):
  File "/opt/local/bin/rosinstall", line 5, in <module>
    pkg_resources.run_script('rosinstall==0.5.22', 'rosinstall')
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/pkg_resources.py", line 499, in run_script
    self.require(requires)[0].run_script(script_name, ns)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/pkg_resources.py", line 1235, in run_script
    execfile(script_filename, namespace, namespace)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/rosinstall-0.5.22-py2.6.egg/EGG-INFO/scripts/rosinstall", line 679, in <module>
    sys.exit(not rosinstall_main(sys.argv))
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/rosinstall-0.5.22-py2.6.egg/EGG-INFO/scripts/rosinstall", line 670, in  rosinstall_main
    subprocess.check_call("source %s && rosmake ros%s --rosdep-install%s" % (os.path.join(options.path, 'setup.sh'), ros_comm_insert, rosdep_yes_insert), shell=True, executable='/bin/bash')
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/subprocess.py", line 488, in check_call
    raise CalledProcessError(retcode, cmd) 
subprocess.CalledProcessError: Command source /Users/shoefer/ros/setup.sh &&  rosmake ros ros_comm --rosdep-install returned non-zero exit status 255

I done everything according to the installation manual, I have installed all necessary packages via MacPorts, activated the MacPorts python 2.6 version etc. I have also checked that I have YAML and boost installed.

Any help would be appreciated!

Sebastian