FreeBSD: scons: done reading SConscript files. error: setting stack size not supported:

При попытке собрать serf (для того же subversion) можно поймать баг

# make -C /usr/ports/www/serf install clean
===>  Building for serf-1.3.4
scons: Reading SConscript files ...
scons: done reading SConscript files.
error: setting stack size not supported:
  File "/usr/local/lib/scons-2.3.0/SCons/Script/Main.py", line 1344:
    _exec_main(parser, values)
  File "/usr/local/lib/scons-2.3.0/SCons/Script/Main.py", line 1308:
    _main(parser)
  File "/usr/local/lib/scons-2.3.0/SCons/Script/Main.py", line 1072:
    nodes = _build_targets(fs, options, targets, target_top)
  File "/usr/local/lib/scons-2.3.0/SCons/Script/Main.py", line 1228:
    jobs = SCons.Job.Jobs(num_jobs, taskmaster)
  File "/usr/local/lib/scons-2.3.0/SCons/Job.py", line 92:
    self.job = Parallel(taskmaster, num, stack_size)
  File "/usr/local/lib/scons-2.3.0/SCons/Job.py", line 365:
    self.tp = ThreadPool(num, stack_size, self.interrupted)
  File "/usr/local/lib/scons-2.3.0/SCons/Job.py", line 280:
    prev_size = threading.stack_size(stack_size*1024)
*** [do-build] Error code 2

Stop in /usr/ports/www/serf.

*** [install] Error code 1

Stop in /usr/ports/www/serf.

Питон нужен версии 2.7

Проверяем опции питона, нас интересует ключ PTH
# make -C /usr/ports/lang/python27 showconfig|grep PTH
     PTH=on: Threading/multiprocessing via GNU Pth

В таком виде не соберется, надо пересобрать без PTH.

Проверялось под 9.1-RELEASE-p10

линки
https://forums.freebsd.org/viewtopic.php?t=43234