This patch was submitted upstream:
https://github.com/scheme/scsh/pull/46

diff --git a/scheme/lib-dirs.scm b/scheme/lib-dirs.scm
index a1fc009..c630fb4 100644
--- a/scheme/lib-dirs.scm
+++ b/scheme/lib-dirs.scm
@@ -75,6 +75,7 @@
               (let ((val (read)))
                 (cond ((eof-object? val) '())
                       ((string? val) (cons val (recur)))
+                      ((symbol? val) (cons (symbol->string val) (recur)))
                       ((not val) (append default-lib-dirs (recur)))
                       (else 
                        (error 
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<tr><td><span title='2020-09-20 12:44:29 +0200'>2020-09-20</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=32e5ffaa7860a4c929ea6778f9efc7171216460d'>gnu: gawk: Update to 5.1.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gawk.scm (gawk): Update to 5.1.0.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-06-29 23:04:08 +0200'>2019-06-29</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=c248e9b0222eb11e14389c30e0bfa29774b366a5'>gnu: gawk: Update to 5.0.1.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gawk.scm (gawk): Update to 5.0.1.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-05-25 00:47:54 +0200'>2019-05-25</span></td><td><a href='/guix/commit/gnu/packages/gawk.scm?id=bb9dec546f839c38b7955f78d46b5405af505f76'>gnu: gawk: Update to 5.0.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/patches/libgpg-error-gawk-compat.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/gnupg.scm (libgpg-error)[source](modules, patches): New fields.
* gnu/packages/gawk.scm (gawk): Update to 5.0.0.
</span></span></td><td>Marius Bakke</td></tr>