Due to http://www.python.org/dev/peps/pep-3149/ distutils.sysconfig.get_config_vars('SO') behaves differently on Python 3.2 that is default on Arch now. This leads to situation when Python 3 packages using numpy cannot find dynamic libraries used trough it. For example scipy requires symlinks:

ln -sf /usr/lib/liblapack.so liblapack.cpython-32mu.so
ln -sf /usr/lib/libblas.so libblas.cpython-32mu.so

The symlinks in there were created, because no easy solution existed at the time. But this isn't good solution in the long run, especially because the bug can touch other Python 3 packages requiring numpy, either on build or runtime/testing. The proper fix is implemented in NumPy 1.6.1 that is released and flagged for longer than month now. Update to numpy package is as simple as change from 1.6.0 to 1.6.1 and generating new md5sum. While update is trivial, I believe the bug is not and should be taken care of either by updating numpy to 1.6.1, or by backporting the patch from 1.6.1 to 1.6.0 if for any reason update isn't desired.

At same time workaround earlier applied to scipy should be removed.