@monkey1 can you please open the gist link that I've sent?

The problem is exactly packing into guix. There is a code that's easy to copy paste and try locally.

Strangely enough it works with just "guile -l ..." and won't work with "guix build -f ...".

Although it builds successfully.

I'm clueless. The only thing I have in mind: tryinggnu-build-system instead guile-build-system.