[MacPorts] #52314: cgal @4.8.1 configure fails on Sierra

[MacPorts]

#52314: cgal @4.8.1 configure fails on Sierra
------------------------------+--------------------------------
 Reporter:  sven.wursthorn@…  |      Owner:  macports-tickets@…
     Type:  defect            |     Status:  new
 Priority:  Normal            |  Milestone:
Component:  ports             |    Version:  2.3.4
 Keywords:  sierra            |       Port:  cgal
------------------------------+--------------------------------
 cgal @4.8.1 configure with cmake fails on Sierra:
 {{{
 :info:configure -- Looking for pthread.h
 :info:configure -- Looking for pthread.h - not found
 :info:configure CMake Error at
 /opt/local/share/cmake-3.6/Modules/FindPackageHandleStandardArgs.cmake:148
 (message):
 :info:configure   Could NOT find Threads (missing: Threads_FOUND)
 :info:configure Call Stack (most recent call first):
 :info:configure
 /opt/local/share/cmake-3.6/Modules/FindPackageHandleStandardArgs.cmake:388
 (_FPHSA_FAILURE_MESSAGE)
 :info:configure   /opt/local/share/cmake-3.6/Modules/FindThreads.cmake:223
 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
 :info:configure
 /opt/local/share/cmake-3.6/Modules/CMakeFindDependencyMacro.cmake:65
 (find_package)
 :info:configure   /opt/local/share/cmake-3.6/Modules/FindBoost.cmake:1401
 (find_dependency)
 :info:configure   cmake/modules/CGAL_SetupBoost.cmake:24 (find_package)
 :info:configure   cmake/modules/CGAL_SetupDependencies.cmake:85 (include)
 :info:configure   CMakeLists.txt:639 (include)
 :info:configure
 :info:configure
 :info:configure -- Configuring incomplete, errors occurred!
 }}}

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Ticket URL: <https://trac.macports.org/ticket/52314>
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