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Guile modules that are meant to be used on the builder side must live in
the (guix build …) name space. They must not refer to
other Guix or GNU modules. However, it is OK for a “host-side” module
to use a build-side module. As an example, the (guix
search-paths) module should not be imported and used by a package since
it isn’t meant to be used as a “build-side” module. It would also
couple the module with the package’s dependency graph, which is
undesirable.
Modules that deal with the broader GNU system should be in the
(gnu …) name space rather than (guix …).