Hi everyone, 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. The tail end of my compilation output is below. Thanks in advance. John cat ghc/ghc.wrapper >> inplace/bin/ghc-stage2 chmod +x inplace/bin/ghc-stage2 "inplace/bin/ghc-stage2" -hisuf dyn_hi -osuf dyn_o -hcsuf dyn_hc -fPIC -dynamic -O -H64m -Wall -hide-all-packages -i -iutils/ghctags/. -iutils/ghctags/dist-install/build -Iutils/ghctags/dist-install/build -iutils/ghctags/dist-install/build/ghctags/autogen -Iutils/ghctags/dist-install/build/ghctags/autogen -optP-include -optPutils/ghctags/dist-install/build/ghctags/autogen/cabal_macros.h -package-id Cabal-1.25.0.0 -package-id base-4.9.0.0 -package-id containers-0.5.7.1 -package-id ghc-8.1 -XHaskell2010 -no-user-package-db -rtsopts -Wnoncanonical-monad-instances -odir utils/ghctags/dist-install/build -hidir utils/ghctags/dist-install/build -stubdir utils/ghctags/dist-install/build -c utils/ghctags/./Main.hs -o utils/ghctags/dist-install/build/Main.dyn_o "inplace/bin/ghc-stage2" -hisuf dyn_hi -osuf dyn_o -hcsuf dyn_hc -fPIC -dynamic -O -H64m -Wall -hide-all-packages -i -iutils/check-api-annotations/. -iutils/check-api-annotations/dist-install/build -Iutils/check-api-annotations/dist-install/build -iutils/check-api-annotations/dist-install/build/check-api-annotations/autogen -Iutils/check-api-annotations/dist-install/build/check-api-annotations/autogen -optP-include -optPutils/check-api-annotations/dist-install/build/check-api-annotations/autogen/cabal_macros.h -package-id Cabal-1.25.0.0 -package-id base-4.9.0.0 -package-id containers-0.5.7.1 -package-id directory-1.2.6.2 -package-id ghc-8.1 -Wall -XHaskell2010 -no-user-package-db -rtsopts -Wnoncanonical-monad-instances -odir utils/check-api-annotations/dist-install/build -hidir utils/check-api-annotations/dist-install/build -stubdir utils/check-api-annotations/dist-install/build -c utils/check-api-annotations/./Main.hs -o utils/check-api-annotations/dist-install/build/Main.dyn_o dyld: lazy symbol binding failed: Symbol not found: _clock_gettime Referenced from: /Users/leo/haskell/ghc/rts/dist/build/libHSrts_thr-ghc8.1.20161010.dylib (which was built for Mac OS X 10.12) Expected in: /usr/lib/libSystem.B.dylib dyld: Symbol not found: _clock_gettime Referenced from: /Users/leo/haskell/ghc/rts/dist/build/libHSrts_thr-ghc8.1.20161010.dylib (which was built for Mac OS X 10.12) Expected in: /usr/lib/libSystem.B.dylib dyld: lazy symbol binding failed: Symbol not found: _clock_gettime Referenced from: /Users/leo/haskell/ghc/rts/dist/build/libHSrts_thr-ghc8.1.20161010.dylib (which was built for Mac OS X 10.12) Expected in: /usr/lib/libSystem.B.dylib dyld: Symbol not found: _clock_gettime Referenced from: /Users/leo/haskell/ghc/rts/dist/build/libHSrts_thr-ghc8.1.20161010.dylib (which was built for Mac OS X 10.12) Expected in: /usr/lib/libSystem.B.dylib make[1]: *** [utils/ghctags/dist-install/build/Main.dyn_o] Trace/BPT trap: 5 make[1]: *** Waiting for unfinished jobs.... make[1]: *** [utils/check-api-annotations/dist-install/build/Main.dyn_o] Trace/BPT trap: 5 make: *** [all] Error 2 i