Im trying to install ROS on a MacBook OS X El Capitan, 10.11.5. Im strictly following the installation guide's advices (http://wiki.ros.org/jade/Installation/OSX/Homebrew/Source) but always fail when it comes to "resolving dependencies" (Chapter 2.1.2):

When I do

rosdep install --from-paths src --ignore-src --rosdistro jade -y

this error occurs

executing command [sudo -H pip install -U pydot]
Downloading/unpacking pydot
  Running setup.py egg_info for package pydot
    Could´t import dot_parser, loading of dot files will not be possible.

Downloading/unpacking pyparsing==1.5.7 (from pydot)
  Running setup.py egg_info for package pyparsing

Installing collected packages: pydot, pyparsing
  Running setup.py install for pydot
    Couldn´t import dot_parser, loading of dot files will not be possible.
    error: [Errno 1] Operation not permitted: '/System/Library/Frameworks/Python.framework/Versions/2.7/./LICENSE'
    Complete output from command /usr/bin/python -c "import setuptools;__file__='/tmp/pip-build/pydot/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-vIj42V-record/install-record.txt --single-version-externally-managed:
    Couldn´t import dot_parser, loading of dot files will not be possible.

[ ... ] and a few lines later:

copying LICENSE -> /System/Library/Frameworks/Python.framework/Versions/2.7/.

error: [Errno 1] Operation not permitted: '/System/Library/Frameworks/Python.framework/Versions/2.7/./LICENSE'

----------------------------------------
Command /usr/bin/python -c "import setuptools;__file__='/tmp/pip-build/pydot/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-vIj42V-record/install-record.txt --single-version-externally-managed failed with error code 1 in /tmp/pip-build/pydot
Storing complete log in /var/root/Library/Logs/pip.log
ERROR: the following rosdeps failed to install
  pip: command [sudo -H pip install -U pydot] failed

What is the problem? Im a beginner to ROS and have no clue how to solve this.