Comment # 3 on bug 1208192 from Benjamin Greiner

The update-alternatives setup of the LAPACK and BLAS zoo probably needs a
makeover.

I noticed on a fresh TW install a few weeks ago that I had to manually
configure the alternative for the libraries in order to get a working numpy. I
can't remember the details though, probably the same commands as Felix'.

IMHO the openBLAS libs should get a higher default priority.