numpy.distutils.system_info fails to know about new multi-arch library paths /usr/lib/x86_64-linux-gnu and the like

[Yves Delley]

Building the "Enthought Tools Suite" componenent "Enable" fails on Ubuntu 11.10 (and possibly older ones) because numpy.distutils.system_info is unable to find the X11-library. The problem might generally hit any python source that relies on numpy's distutils to locate binary libraries for them.

I was able to solve it by using a custom "site.cfg" file, it could also be solved just as well by updating the default paths directly in numpy/distutils/system_info.py.

Note that in fact I was in fact using a custom built version of the python-numpy package. This was to in order to gain support of a custom built optimised ATLAS. For that I took the exact package sources via "apt-get source atlas python-numpy", built a custom atlas using "debian/rule custom" and then standard python-numpy using a modified site.cfg in order to include ATLAS. Therefore, I never tried to build ETS Enable without any site.cfg. However, upon inspection of the source-code of
numpy.distutils.system_info, I am quite confident that also without any site.cfg, the mutli-arch library directories are not found.