Stack from MacPorts doesn’t build on snow leopard, and I don’t recall it ever
built in previous years.
The port health page can be pretty misleading, to be honest.
You can get a much better idea of what is really building here:
https://packages.macports.org/stack/
https://packages.macports.org
I’d recommend starting with the low-hanging fruit. These are all stack-based
builds, and stack can build itself back to Snow Leopard:
https://ports.macports.org/port/stack/details/
Why doesn’t stack-based pandoc also build back to Snow Leopard? Is this a
MacPorts issue or a Haskell-world issue?