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The recent refactoring (?) of the threads code appears to break linking with ./configure --disable-threads on OS X 10.10 with clang-3.7 (git, MacPorts).

  CCLD     src/or/tor
Undefined symbols for architecture x86_64:
  "_tor_cond_wait", referenced from:
      _worker_thread_main in libor.a(workqueue.o)
  "_spawn_func", referenced from:
      _threadpool_new in libor.a(workqueue.o)
  "_tor_cond_signal_all", referenced from:
      _threadpool_queue_update in libor.a(workqueue.o)
  "_tor_cond_uninit", referenced from:
      _tor_cond_free in libor.a(compat_threads.o)
  "_tor_cond_init", referenced from:
      _tor_cond_new in libor.a(compat_threads.o)
      _threadpool_new in libor.a(workqueue.o)
  "_tor_get_thread_id", referenced from:
      _tor_set_openssl_thread_id in libor-crypto.a(crypto.o)
      _set_main_thread in libor.a(compat_threads.o)
      _in_main_thread in libor.a(compat_threads.o)
  "_tor_mutex_init_nonrecursive", referenced from:
      _tor_mutex_new_nonrecursive in libor.a(compat_threads.o)
      _threadpool_new in libor.a(workqueue.o)
  "_tor_mutex_uninit", referenced from:
      _clean_up_backtrace_handler in libor.a(backtrace.o)
      _tor_mutex_free in libor.a(compat_threads.o)
      _threadpool_new in libor.a(workqueue.o)
  "_tor_mutex_init", referenced from:
      _init_logging in libor.a(log.o)
      _configure_backtrace_handler in libor.a(backtrace.o)
      _tor_mutex_new in libor.a(compat_threads.o)
      _replyqueue_new in libor.a(workqueue.o)
  "_tor_mutex_acquire", referenced from:
      _logv in libor.a(log.o)
      _tor_log_update_sigsafe_err_fds in libor.a(log.o)
      _tor_log_get_logfile_names in libor.a(log.o)
      _logs_free_all in libor.a(log.o)
      _add_stream_log in libor.a(log.o)
      _logs_set_domain_logging in libor.a(log.o)
      _add_temp_log in libor.a(log.o)
      ...
  "_tor_mutex_release", referenced from:
      _logv in libor.a(log.o)
      _tor_log_update_sigsafe_err_fds in libor.a(log.o)
      _tor_log_get_logfile_names in libor.a(log.o)
      _logs_free_all in libor.a(log.o)
      _add_stream_log in libor.a(log.o)
      _logs_set_domain_logging in libor.a(log.o)
      _add_temp_log in libor.a(log.o)
      ...
  "_tor_cond_signal_one", referenced from:
      _threadpool_queue_work in libor.a(workqueue.o)
  "_tor_threads_init", referenced from:
      _tor_main in libtor.a(main.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[1]: *** [src/or/tor] Error 1
make: *** [all] Error 2