Do you have/know a developer working on it? Shell or m4 or whatever to fold 
detection in?
The authors of these packages ought to have canonical tests for 
existence/version that can be included.
Although I am retired, and as a result not as sharp as I should be, I was a 
software engineer, and can work with the
SAGE engineers to help make this happen. It all follows a pattern, and 
design decisions can be made. 
I will go and read what was written in trac.

On Thursday, March 7, 2019 at 2:39:09 AM UTC-6, Dima Pasechnik wrote:
>
> On Thu, Mar 7, 2019 at 7:54 AM Ike Stoddard <[email protected] 
> <javascript:>> wrote: 
> > 
> > What about --with-blas=atlas configure argument? Where is that consumed? 
> > I believe ./configure is at fault. Specifying atlas is detected in 
> configure:7054 line 
> > but by line 9050 it is forgotten. Despite specifying it, atlas was 
> built! 
> > "sage_spkg_install_openblas" has been set to "no" but is not referenced 
> later. 
>
>
> this is not implemented yet, I think. A similar implementation for 
> multiprecision libraries 
> (where one gets to choose between GMP and MPIR) is almost ready on 
> https://trac.sagemath.org/ticket/27212 
> See https://trac.sagemath.org/ticket/27330 for the task of implementing 
> these. 
>
> An invocation for the system blas would be --with-blas=system, if we 
> follow what we did for GMP/MPIR, but this looks less clear here. 
>
>
>
> > 
> > 
> > On Monday, March 4, 2019 at 4:46:06 AM UTC-6, François Bissey wrote: 
> >> 
> >> If you want a particular bias/lapack you’ll have to start back at the 
> configure options. 
> >> If you want to use something already installed, I guess you can tinker 
> with 
> >> blas.pc, blas.pc and lapack.pc in SAGE_LOCAL/lib/pkgconfig/. 
> >> 
> >> 
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