Problem with re-installing my ports after migration from El Capitan to Sierra 
is SOLVED — at least with respect to installing gmp (upon which quite a few 
other ports depend)!

That ‘__SWIFT_UNAVAILABLE_MSG” error, which ultimately points back to 
Availability.h was the clue indeed: As a workaround some time ago for the bug 
discussed in ticket #48471, I had edited a local copy of Availability.h and put 
it into /opt/local/include.

Simply removing that local copy from /opt/local/include now allows installation 
of gmp to proceed to completion. And more.

> On Nov 2, 2016, at 11:17 PM, Ken Cunningham <> 
> wrote:
> Murray, I note the error in your log looks somewhat like this error in trac:
> < 
> <>>
> …
> Ken

Murray Eisenberg              
503 King Farm Blvd #101 Home (240)-246-7240
Rockville, MD 20850-6667        Mobile (413)-427-5334

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