I did some research on the source code of lua package. From

https://github.com/guix-mirror/guix/blob/f9c62b23cc88541756656b3ec602ce987828d906/gnu/packages/lua.scm#L179

we can find that luajit deleted "powerpc64le-linux" from the supported
system list, which lua package didn't. So I think we should keep that
fallback.

Hope this helps.

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Zongyuan Li