guile-wm / xcb questions

[ng0]

I am able to use guile-wm. It starts, I can work it for a
very long time without crashing.
I'm trying to learn more about it so that I can extend it.
Now there's a problem where I'm not sure if the problem
lies within the Guix package or my way to load the module:

> scheme@(guile-user)> (use-modules (guile-wm module root-keymap))
> While compiling expression:
> no code for module (xcb xml)

guile-wm/modules/root-keymap.scm includes the set-rootkey
I'm trying to debug in my config of Guile-wm. Now Guile-wm
depends on Guile-xcb and the store folder of the guile-wm
build references guile-xcb.
When guile-wm is installed globally (system-wide) shouldn't
the xcb module be in my guile load path?
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