Hello Erik. I tried to use g-golf on Guix recently, and gave up, because while Guix’ guile-g-golf depends on glib@2.73.3, Guix’ gtk (GTK4) and gtk+ (GTK3, GTK2) depend on glib@2.72.3. In other words, I believe that currently, g-golf cannot be used with gtk in Guix. Upgrading gtk’s glib in the Guix source code caused issues with other software (that I’m sure someone someday will fix), though I do not remember exactly. Using Fedora’s GTK with Guix’ might be possible with tricks, but normally the software in Guix is patched to make it use only software from Guix.
Regards, Florian