I ended up pushing a patch [1] for this as part of [2]. This has now been released by upstream, so the change doesn't exist in the Guix codebase any longer (the package was updated in [3]).
1: e61f092c877da5a9dc5dcdd82690bd3c191769e1 https://git.savannah.gnu.org/cgit/guix.git/commit/?id=e61f092c877da5a9dc5dcdd82690bd3c191769e1 2: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=32303 3: 7bb7920f64a871eadd8e76687f72673ef2298746 https://git.savannah.gnu.org/cgit/guix.git/commit/?id=7bb7920f64a871eadd8e76687f72673ef2298746
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