Index: thread.hpp
===================================================================
--- thread.hpp	(revision 61022)
+++ thread.hpp	(working copy)
@@ -6,7 +6,9 @@
 // (C) Copyright 2007-8 Anthony Williams
  
 #include <boost/thread/exceptions.hpp>
+#ifndef BOOST_NO_IOSTREAM
 #include <ostream>
+#endif
 #include <boost/thread/detail/move.hpp>
 #include <boost/thread/mutex.hpp>
 #include <boost/thread/xtime.hpp>
@@ -430,6 +432,7 @@
             return !(thread_data<y.thread_data);
         }
 
+#ifndef BOOST_NO_IOSTREAM
         template<class charT, class traits>
         friend std::basic_ostream<charT, traits>& 
         operator<<(std::basic_ostream<charT, traits>& os, const id& x)
@@ -443,6 +446,7 @@
                 return os<<"{Not-any-thread}";
             }
         }
+#endif
     };
 
     inline bool thread::operator==(const thread& other) const