Comment # 39 on bug 1177260 from 
(In reply to Stefan Br���ns from comment #38)
> (In reply to Egbert Eich from comment #37)
> > 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.
> 
> It is still available in the backports, e.g.
> https://build.opensuse.org/package/show/openSUSE:Backports:SLE-15-SP4/cblas
> 
> On the other hand, doing anything conditionally for Leap/SLE 15 in the
> current python-numpy package is quite pointless, as it requires Python 3.8.

Right. Since numpy is built against SLE where we just provide a newer python -
but no libraries - we cannot update it.
Still, if we had cblas from netlib-lapack, we could rebuild it with cblas from
it.

> > > (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?
> 
> CBLAS was imported into LAPACK in August 2014 [1], and became part of LAPACK
> 3.6.0 (released November 2015 [2]).
> 
> Leap 15.2 had the standalone CBLAS (which is just a fairly thin wrapper
> around BLAS), which is still available here:
> https://netlib.org/blas/#_cblas

Ok, then the reason why the CBLAS-enabled numpy version was lost was that Leap
acquired the python packages from SLE - where we obviously weren't able to
build against it.
The first step towards this would be to update Lapack on SLE to a version that
provides CBLAS.

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