$OpenBSD: patch-boost_config_suffix_hpp,v 1.7 2010/03/30 11:00:15 robert Exp $
--- boost/config/suffix.hpp.orig	Tue May 12 18:19:58 2009
+++ boost/config/suffix.hpp	Tue May 12 18:21:48 2009
@@ -225,7 +225,8 @@
 // from here then add to the appropriate compiler section):
 //
 #if (defined(__MT__) || defined(_MT) || defined(_REENTRANT) \
-    || defined(_PTHREADS) || defined(__APPLE__) || defined(__DragonFly__)) \
+    || defined(_PTHREADS) || defined(_POSIX_THREADS) \
+    || defined(__APPLE__) || defined(__DragonFly__)) \
     && !defined(BOOST_HAS_THREADS)
 #  define BOOST_HAS_THREADS
 #endif