Thanks very much Brandon for your fast reply!  That did the trick.  I had to rerun configure as well since when I didn't do that I got a different but seemingly related error.  But after clean, configure and make everything seems to work again.

John

On Mon, Oct 10, 2016 at 8:27 PM, Brandon Allbery <allbery.b@gmail.com> wrote:

On Mon, Oct 10, 2016 at 11:22 PM, John Leo <leo@halfaya.org> wrote:
I'm trying to compile ghc from the latest source and am hitting an error "Symbol not found: _clock_gettime".  I'm on Mac El Capitan and recently installed Xcode 8 which I'm sure is what caused the problem.  Using Google I found some relevant pages including this one
but I've been unable to figure out what I can do to fix the problem.  Any help would be appreciated.

You need to download the 10.11 Command Line Tools from download.apple.com and reinstall them over the Xcode 8 command line tools, which are for 10.12 and will have problems like this. (Apple intends to correct this in Xcode 8.1.) You need a free Mac Developer account for this, or maybe you can find the 10.11 tools elsewhere. You will then need to clean and rebuild ghc.

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