They should work with a large range of amd64 compatible Mac OS X releases.  For example every recent release is configured to be able to use the older / mach flavored time system calls.  

That’s said, please test them in your environment.  It’s super safe to install multiple ghc flavors and versions in the same computer the. Just change your path variables.  If you find issues please report them on the ghc issues tracker and we can try to help you. 

On Tue, Jan 28, 2020 at 9:54 AM Troels Henriksen <athas@sigkill.dk> wrote:
When new versions of GHC come out, I suppose they work on the newest
macOS.  But what is the oldest macOS they will support?  Is there a
policy in place?  If not, do they tend to work in practice?  I am
particularly concerned with the binary distributions.

--
\  Troels
/\ Henriksen
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