Comment # 21 on bug 1223783 from Egbert Eich

I've noticed you're doing:
%{_sysconfdir}/alternatives/libcblas.so.%{so_ver}_%{_arch}
we used to do:
%{_sysconfdir}/alternatives/libcblas.so.3%{?a_x}
defining %a_x as:
%if 0%{?suse_version} > 1500
%define a_x _%{_arch}
%endif
which was introduced with:
https://build.opensuse.org/package/rdiff/science/lapack?linkrev=base&rev=35

I don't remember why we made this conditional to disable it for SLE/Leap. 
These name extensions appear to be harmless and are needed to distinguish build
targets.
This may have helped around errors during staging for SLE-15 due to some faulty
test.
@Richi - do you remember?