Hello 

> Unfortunately it does not look that simple. OpenBLAS is optimized for z13, but
> our s390x port is supposed to support all the z systems (see [1]).

what about asking for a a z13-support package to the isa-support (source 
package) maintainer.
This way it could be possible to upload an optimise vesion of openblas which 
can install on recent enought s390x machines.

the question will be then : does the buildd support these instructions ?

Cheers

Fred

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