diff -ruN mzR.old/src/boost/config/stdlib/libstdcpp3.hpp mzR/src/boost/config/stdlib/libstdcpp3.hpp
--- mzR.old/src/boost/config/stdlib/libstdcpp3.hpp      2012-03-13 21:08:34.000000000 +0100
+++ mzR/src/boost/config/stdlib/libstdcpp3.hpp  2012-05-11 14:52:48.130021176 +0200
@@ -31,7 +31,9 @@

 #ifdef __GLIBCXX__ // gcc 3.4 and greater:
 #  if defined(_GLIBCXX_HAVE_GTHR_DEFAULT) \
-        || defined(_GLIBCXX__PTHREADS)
+        || defined(_GLIBCXX__PTHREADS) \
+        || defined(_GLIBCXX_HAS_GTHREADS) \
+        || defined(_WIN32)
       //
       // If the std lib has thread support turned on, then turn it on in Boost
       // as well.  We do this because some gcc-3.4 std lib headers define _REENTANT