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Date: Sun, 21 Jun 2020 16:16:06 -0700
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Subject: Re: What's the official state of Python module scipy in Cygwin?
To: moss AT cs DOT umass DOT edu
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E.M.,

Can you please clarify several points you make?

- In the Cygwin installer, I find no "lapack", but searching the installer
for that term does return "liblapack". Would that Cygwin package suffice?
If not, how would you suggest I install it?

- In the Cygwin installer, I find no "openblas", but searching the
installer for that term does return "libopenblas" (and the Cygwin installer
tells me I already have v 0.3.9-1 installed). Does that suffice?

- In the Cygwin installer, I find no "gcc", "g++", or "gfortran", but
searching the installer for those terms does return "gcc-core", "gcc-g++",
"libgfortran4", and "libgfortran5". Can you please tell me the exact
spellings of the packages that worked for you? I lack the background to
interpret your informal descriptions.

- In the Cygwin installer, I find Packages with names of the form
"python37-" followed respectively by "tkinter", "six", and "wheel", and I'm
pretty confident that the long names I've found are what you're describing.
Are you saying that these three are necessary for installing scipy, or that
they're possibly necessary, and you're not sure?

Since you had recent success installing scipy, I'd like to try your recipe,
but could use exact spellings if you have time. Thank you.


On Sun, Jun 21, 2020 at 12:40 PM Eliot Moss <moss AT cs DOT umass DOT edu> wrote:

> You need to install openblas (and lapack, if openblas does not install it).
>
> You also need gcc, g++, and gfortran for building various components, and
> the suitable python-devel and python-pip packages.  I further have the
> suitable python tkinter, six, and wheel packages installed from cygwin.
>
> I am finding that building scipy takes quite a while (a lot of long
> C and Fortran optimizing compilations).
>
> Above, when I say "suitable", I mean python37 (or whatever).  scipy
> built for me under 3.7 just now, and I am starting a 3.8 build, which
> will require a local build of numpy, I believe, tediously longer :-) ...
>
> Regards - Eliot Moss
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