On Mon, 27 Jul 2020, zimoun wrote:

> Dear,
>
> The issue was in the “formatting” and “source” checkers, something
> inconsistent with other parts (see “search-path %load-path”).
>
> Therefore, “--load-path=path/to/modules” is now ’canonicalize-path’,
> directly in “(guix scripts build)%standard-build-options” from where the
> other load-path options derive.
>
> See patch http://issues.guix.gnu.org/42543#2

Thank you. I've applied the patches and it fixes the problem for me. My 
computer had some free cycles, so I ran the Guix test suite (make check) 
and all looks good:

============================================================================
Testsuite summary for GNU Guix 1.0.1.20277-f43458
============================================================================
# TOTAL: 1065
# PASS:  1058
# SKIP:  5
# XFAIL: 2
# FAIL:  0
# XPASS: 0
# ERROR: 0
============================================================================

Best wishes,
Jack