I am running patch-set from that link on my machine and it's working
without any modifications. I'd like to see it got merged.

FYI, I just switch to Guix recently. Also I am not very familar this
email workflow yet.

> There already exists a patch-set to add seatd and greetd to Guix [1],
> maybe you could try testing the patch-set and see if it works for you?
>
> [1] https://issues.guix.gnu.org/49969
>
> Best,
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