The package python-yaml installs the python3 version of yaml. I think, 
there is a python2-yaml package in the repositories.

I used the following command to install the dependencies on my Arch system:

pacman -S python python2 cmake wget python2-yaml mercurial 
python2-distribute subversion python-imaging python2-numpy boost pkg-config


For some reason I needed log4cxx as well, which you find in AUR:

yaourt -S log4cxx



Am 08.07.2011 09:32, schrieb Andrea:
> Dear All,
> I try to install ros on my linux system (Arch Linux 32bit), I use this
> guide http://www.ros.org/wiki/diamondback/Installation/Arch to install
> it. but when I digit
>
> rosinstall ~/ros
> "http://packages.ros.org/cgi-bin/gen_rosinstall.py?rosdistro=diamondback&variant=desktop-full&overlay=no"
>
>
>
>
> I receive this message:
>
> Traceback (most recent call last):
>     File "/usr/bin/rosinstall", line 5, in<module>
>       pkg_resources.run_script('rosinstall==0.5.16', 'rosinstall')
>     File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 499,
> in run_script
>       self.require(requires)[0].run_script(script_name, ns)
>     File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 1235,
> in run_script
>       execfile(script_filename, namespace, namespace)
>     File
> "/usr/lib/python2.7/site-packages/rosinstall-0.5.16-py2.7.egg/EGG-INFO/scripts/rosinstall",
> line 23, in<module>
>       import yaml
> ImportError: No module named yaml
>
> Since that when I had to use sudo easy_install-2.7 instead sudo
> easy_install because "easy_install" doesn't work in my distribution.
>
> Thanks
>
> Andrea
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