No rospkg Arch Linux [closed]

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Hi,

I am trying to compile all the packages in Arch Linux but I received an error. I installed with success the ros-core. Now the problem is this: I followed this http://www.ros.org/wiki/fuerte/Installation/Arch (guide) but when I write the command:

rosmake -a

I receive this message:

mkdir -p bin   cd build && cmake -Wdev
-DCMAKE_TOOLCHAIN_FILE=`rospack find rosbuild`/rostoolchain.cmake  ..   [rosbuild] Building package ivcon   [rosbuild] Error from syntax check of ivcon/manifest.xml   Traceback (most recent call last):
    File "<string>", line 1, in <module>
    File "/opt/ros/fuerte/lib/python2.7/site-packages/roslib/__init__.py", line 50, in <module>
      from roslib.launcher import load_manifest
    File "/opt/ros/fuerte/lib/python2.7/site-packages/roslib/launcher.py", line 42, in <module>
      import rospkg   ImportError: No module named 'rospkg'   CMake Error at /opt/ros/fuerte/share/ros/core/rosbuild/private.cmake:78 (message):
    [rosbuild] Syntax check of ivcon/manifest.xml failed; aborting   Call Stack (most recent call first):
    /opt/ros/fuerte/share/ros/core/rosbuild/public.cmake:174 (_rosbuild_check_manifest)
    CMakeLists.txt:3 (rosbuild_init)

     -- Configuring incomplete, errors occurred!

It seems that I have not rospkg installad, but it is not. I follewed this http://answers.ros.org/question/39657/importerror-no-module-named-rospkg/ (post) without success. Could you help me? Thanks in advance