Ok, thanks. 

2019年1月6日(日) 18:00 Ricardo Wurmus <rekado@elephly.net>:

荒井吉則 <kumagusu08@gmail.com> writes:

> My knowladge of guixsd configuration is not enogh to make my own
> configuration yet. but my expectation is that I could ajdust system
> configuration according to ordinal way of postinstallation.
>
> For instance, locale setting at config.scm is to install additional fonts
> according to locale or config of multiboot is that I could edit
> /etc/grub.d/40_custom for postinstallation.

This won’t work on a Guix system, because it does not generally consult
files in /etc.  Most system configuration files are generated when
running “guix system init” (or “guix system reconfigure”) using the
information provided in the system configuration file.

--
Ricardo