Hi. I understood your patch now, and believe that this is the recommended way to cross-build libidn2 when built from git. I've uploaded your fix to Debian. I would have catched this if the Salsa cross-build job hadn't been disabled, and the job is now enabled (and passes), so I hope I will catch future cross build problems early. The following upstream bug about generating these files from non-C code now exists, but given the idn2.1 issue I'm not really sure it is worth spending time on since I don't see any way to resolve the problem fully for as long as we rely on help2man.
https://gitlab.com/libidn/libidn2/-/issues/129 Thanks, /Simon
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