Follow-up Comment #3, bug #63042 (project groff):
..but feel free to simply take it and integrate as a regular groff thing!
It was just that the 2014/5 patch i think never was integrated in a build
system, and this thing now just integrates into the groff build system.
Ciao.
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Update of bug #63042 (project groff):
Summary: Enhancement: mdocmx(7) extension to mdoc(7) =>
[PATCH] Enhancement: mdocmx(7) extension to mdoc(7)
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Follow-up Comment #4:
This appears to be an updated version of bug #4503
