Per Guix QA, all builds succeed except for "i586-gnu".  Still not sure
why my system fails the check phase when emulating "armhf-linux".  Will
attribute to user-error.

Attached is an updated patch which builds successfully on my
x86_64-linux system.

Changes from the original patch:
* Moved propagated-inputs to inputs.
* Added perl to inputs.
* Removed (setenv "LC_ALL" "en_US.UTF-8") from configure phase.
* Added (supported-systems ...) at the end to reflect the systems
indicated by Guix QA as building correctly.

Best regards.

-- 
Martin Marshall
law@martinmarshall.com