Thank you David, thank you Matija, it works on Guix! Except for small warnings like Warning: Missing /etc/X11/rgb.txt, using a fallback. that probably should be fixed on the Guix side.
And some issues that I have to chdir to ~/src/g-golf/examples/gtk-4/ to run ~/src/g-golf/examples/gtk-4/revealer.scm, otherwise I get g-golf/hl-api/function.scm:89:6: Failed to open file ???/home/florian/ui/revealer.ui???: No such file or directory And some locale issues when running adwaita demo only when running in a container, ERROR: In procedure dirname: In procedure scm_to_utf8_stringn: Wrong type argument in position 1 (expecting string): #f probably because I set up the container wrongly. Regards, Florian