Here’s the line that I would guess is failing.
Is there any way to make available /dev/ptmx at checkPhase?
Would that be an impurity?
I see the sandbox-paths option but that wouldn’t be an ideal solution for a public flake, would it? Or am I missing something?
I had the idea of creating my own /dev/ptmx in the sandbox but I’m not sure whether that’s a good thread to pull on.
Please illumine me.