when building latest GHC on Mac with Xcode 8: Symbol not found: _clock_gettime

Brandon Allbery allbery.b at gmail.com
Tue Oct 11 03:27:10 UTC 2016

On Mon, Oct 10, 2016 at 11:22 PM, John Leo <leo at 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
> https://mail.haskell.org/pipermail/ghc-devs/2016-July/012511.html
> 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.

brandon s allbery kf8nh                               sine nomine associates
allbery.b at gmail.com                                  ballbery at sinenomine.net
unix, openafs, kerberos, infrastructure, xmonad        http://sinenomine.net
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