I had a quick look and these packages
(https://github.com/PolyMathOrg/PolyMath) are indeed stored in Tonel
format. Metacello does not support that in Squeak at the moment.

I minimally ported the basic Monticello reading and writing of Tonel
to Squeak last year (not in Trunk), but it only allows you to load
packages from the file system one at a time through Monticello (no
dependency management and not even proper version management).

The Git Browser can also load Tonel projects (and manage versions in
Git, obviously), but it does not do dependency management either.
Moreover if this library is written for Pharo 7 and 8, it's fairly
sure that something will not work (or even load) out of the box in
Squeak. At least some porting effort would probably be required.

Am Sa., 25. Apr. 2020 um 00:00 Uhr schrieb Robert via Squeak-dev
<squeak-dev at lists.squeakfoundation.org>:
>
> Hi Stéphane,
>
> I see the links to github hosted code. Can Squeak load these somehow? Hopefully not in Tonal format! How could I load these?
>
> Kindly,
> Robert
>
>
> On Fri, Apr 24, 2020 at 17:08, Stéphane Rollandin <lecteur at zogotounga.net> wrote:
>
> Also, it is part of SciSmalltalk according to the 2015 version of the book:
>
> https://files.pharo.org/books-pdfs/numerical-methods/2015-NumericalMethods-EN.pdf
>
> https://github.com/PolyMathOrg/PolyMath/wiki/SciSmalltalk-Contents
>
> Stef
>
>
>
>