Hello Jorge,

"Jorge" <jorge+list@disroot.org> writes:

> I would prefer to get Emacs 26 from Guix, which would be more
> automatic and would come configured to work with Guix-installed Emacs
> packages.

Guix package collection provides only stable package releases for the
most part.

> So is Emacs 26 available from Guix?  Unfortunately ~guix package
> --show=emacs~ only reports version 25.3, but maybe there is a non
> intuitive way to get Emacs 26.

You could write a package recipe with a new version based on original
recipe, see [1].

Also you could try ‘--with-source’ [2], but in Emacs case the package
recipe should be tweaked a little bit, so it will probably not work.

[1]  http://lists.gnu.org/archive/html/help-guix/2017-09/msg00074.html
[2]  https://www.gnu.org/software/guix/manual/html_node/Package-Transformation-Options.html#Package-Transformation-Options

Oleg.