Comment # 37 on bug 1177260 from Egbert Eich

Stefan Br���ns from comment #36)
> Unfortunately for Leap, the current python3-numpy package is crippled again,
> as the cblas dependency has been removed.
> 
> So while we are likely good on TW, the funny smell of SLE/Leap 15 becomes
> hard to ignore.

This is pretty much a catch-22 situation. We need to have cblas available in
SLE before we can build numpy with it. 
It used to be built against openblas, but this made openblas a hard runtime
requirement for it.
If it is built with a version of netlib-lapack, that provides cblas, you can
optionally use OpenBLAS as well.
SO we will first have to provide CBLAS and then we can fix up numpy.(In reply
to Stefan Br���ns from comment #36)
> (In reply to Egbert Eich from comment #35)
> > I believe the underlying issues here have been resolved by now, the
> > netlib-lapack and OpenBLAS packages in Factory are such that lapack linked
> > executables can now load OpenBLAS libraries.
> > To changing the lapack package so that the libraries are switched en-block
> > is not necessarily required to satisfy this feature.
> 

> (And no, missing cblas is not "unfixable", Leap 15.2 still had it.)

Are you sure?  What change made it go away? 
Wasn't it the switch of numpy to netlib-lapack that caused this?