Can anyone point me to how to build Rust programs on no-longer-supported Intel MacOS versions (edit: eg. v10.12, looks like that's the current cutoff for tier 2)?

I also wanted zig for ncdu2.

I admit I haven't looked too hard, macports has most of what I need still covered. It's always a sad day on my older hardware when I don't have brew auto-update disabled and a MacOS version goes out of support.