[2.6.0-beta1 & LibcxxOnOlderSystems] stack fails to build

[Joshua Root]

On 2019-9-5 02:30 , Ken Cunningham wrote:
> The new ghc infrastructure is broken on 10.6, and at a quick glance, it looks like it starts building at 10.8, which is actually not too bad, and better than I thought:  <https://ports.macports.org/port/ghc/builds>
> 
> I am not sure if i will ever get around to trying to fix the older systems, and I would doubt if anyone else ever will. It might or might not be possible to do so.

It looks like the compiler version check is just assuming that all
compilers are gcc. It checks whether the version is at least 4.4, which
is correct for gcc but not for clang.

- Josh