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diff --git a/boost/config/stdlib/libstdcpp3.hpp b/boost/config/stdlib/libstdcpp3.hpp
index 52d5837..aaa8890 100644
--- a/boost/config/stdlib/libstdcpp3.hpp
+++ b/boost/config/stdlib/libstdcpp3.hpp
@@ -33,7 +33,8 @@
 
 #ifdef __GLIBCXX__ // gcc 3.4 and greater:
 #  if defined(_GLIBCXX_HAVE_GTHR_DEFAULT) \
-        || defined(_GLIBCXX__PTHREADS)
+        || defined(_GLIBCXX__PTHREADS) \
+        || defined(_GLIBCXX_HAS_GTHREADS)
       //
       // 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