[ros-users] ROS installation error on archlinux

I am trying to install ROS on archlinux and I get the following error when trying to use rosinstall...

print "Rospack failed to build" 
                                  ^
SyntaxError: invalid syntax
Traceback (most recent call last):
  File "/usr/bin/rosinstall", line 5, in <module>
    pkg_resources.run_script('rosinstall==0.5.8', 'rosinstall')
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 489, in run_script
    self.require(requires)[0].run_script(script_name, ns)
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 1214, in run_script
    exec script_code in namespace, namespace
  File "/usr/lib/python2.7/site-packages/rosinstall-0.5.8-py2.7.egg/EGG-INFO/scripts/rosinstall", line 501, in <module>

File "/usr/lib/python2.7/site-packages/rosinstall-0.5.8-py2.7.egg/EGG-INFO/scripts/rosinstall", line 492, in rosinstall_main

  File "/usr/lib/python2.7/subprocess.py", line 504, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command 'source /home/user1/ros/setup.sh && rosmake rostest --rosdep-install' returned non-zero exit status 1

Any help is appreciated