math/cgal build error

[mlh%goathill.org@localhost (MLH)]

This has been going on for a couple of months now - ideas?

NetBSD 7.99.24 (GENERIC) #1: Fri Dec 11 08:47:19 EST 2015
current pkgsrc as of last night

math/cgal:

-- USING GMP_VERSION = '6.1.0'
-- MPFR include:      /pkg_comp/obj/pkgsrc/math/cgal/default/.buildlink/include
-- MPFR libraries:    /pkg_comp/obj/pkgsrc/math/cgal/default/.buildlink/lib/libmpfr.so
-- MPFR definitions:  
-- USING MPFR_VERSION = '3.1.3'
CMake Error at cmake/modules/FindBoost.cmake:917 (message):
  Unable to find the requested Boost libraries.

  Boost version: 1.59.0

  Boost include path:
  /pkg_comp/obj/pkgsrc/math/cgal/default/.buildlink/include

  The following Boost libraries could not be found:

          boost_thread

  No Boost libraries were found.  You may need to set Boost_LIBRARYDIR to the
  directory containing Boost libraries or BOOST_ROOT to the location of
  Boost.
Call Stack (most recent call first):
  cmake/modules/CGAL_SetupBoost.cmake:12 (find_package)
  cmake/modules/CGAL_SetupDependencies.cmake:32 (include)
  CMakeLists.txt:422 (include)


-- Boost include:     /pkg_comp/obj/pkgsrc/math/cgal/default/.buildlink/include
-- Boost libraries:   
-- Boost definitions: 
-- USING BOOST_VERSION = '1.59.0'
CMake Warning (dev) at CMakeLists.txt:458 (if):
  Policy CMP0054 is not set: Only interpret if() arguments as variables or
  keywords when unquoted.  Run "cmake --help-policy CMP0054" for policy
  details.  Use the cmake_policy command to set the policy and suppress this
  warning.

  Quoted variables like "CGAL_CFG_ARRAY_MEMBER_INITIALIZATION_BUG" will no
  longer be dereferenced when the policy is set to NEW.  Since the policy is
  not set the OLD behavior will be used.
This warning is for project developers.  Use -Wno-dev to suppress it.

...

-- Library configs detected: /CMakeLists.txt;Core/CMakeLists.txt;ImageIO/CMakeLists.txt;Qt3/CMakeLists.txt;Qt4/CMakeLists.txt
-- Configuring incomplete, errors occurred!
See also "/pkg_comp/obj/pkgsrc/math/cgal/default/CGAL-3.9/CMakeFiles/CMakeOutput.log".
See also "/pkg_comp/obj/pkgsrc/math/cgal/default/CGAL-3.9/CMakeFiles/CMakeError.log".
*** Error code 1

Stop.