$OpenBSD: patch-boost_config_stdlib_libstdcpp3_hpp,v 1.2 2008/01/06 00:01:15 deanna Exp $
--- boost/config/stdlib/libstdcpp3.hpp.orig	Thu Dec  1 10:00:33 2005
+++ boost/config/stdlib/libstdcpp3.hpp	Mon Dec 31 02:29:05 2007
@@ -29,6 +29,15 @@
 #  define _REENTRANT
 #endif
 
+// This is a hack for OpenBSD. Currently OpenBSD's gcc is compiled
+// with thread model = single. Many references on the net indicate
+// multithreaded c++ applications will have problems with c++
+// exceptions and the high-speed caching allocator. However in
+// practice we have many multithreaded c++ applications that haven't
+// seen these problems. We may be playing with fire but...
+#ifdef __OpenBSD__
+#  define BOOST_HAS_THREADS
+#else
 #ifdef __GLIBCXX__ // gcc 3.4 and greater:
 #  if defined(_GLIBCXX_HAVE_GTHR_DEFAULT) \
         || defined(_GLIBCXX__PTHREADS)
@@ -46,6 +55,7 @@
         && !defined(_GLIBCPP__PTHREADS)
    // disable thread support if the std lib was built single threaded:
 #  define BOOST_DISABLE_THREADS
+#endif
 #endif
 
 #if (defined(linux) || defined(__linux) || defined(__linux__)) && defined(__arm__) && defined(_GLIBCPP_HAVE_GTHR_DEFAULT)
