At this question @zugzwang asked for my take on this meta question. This was my response, in case it helps somehow:
I don't have much to say about [this], mainly because I don't build Emacs and I don't use it on GNU/Linux (unfortunately). I use it on MS Windows, given a Windows binary. I know very little about the questions raised [here].
That said, in my ignorance about such things I'd think that questions about building, installing, upgrading, downgrading, etc. Emacs would be on topic here. (But I won't be contributing to them because of my unfamiliarity.) Off-topic would be questions that dig into the OS beyond such Emacsy questions.
Just one (uninformed) opinion, in case it helps.
