The actual problem I'm trying to solve for the last 3 hours is to just make it run: `guile -c "(pk (@ (gnu packages emacs) emacs-pgtk))"` without backtraces thrown in my face. However, I can't simply do it.

It was a long way, but I finally hacked everything together with simple:
guix shell guile-next guix -- guile \
-c "(pk (@ (gnu packages emacs) emacs-pgtk))"

#guix #guile