Index: boost/thread/pthread/condition_variable.hpp
===================================================================
--- boost/thread/pthread/condition_variable.hpp	(revision 66408)
+++ boost/thread/pthread/condition_variable.hpp	(working copy)
@@ -52,6 +52,7 @@
         guard.activate(m);
         int const res=pthread_cond_wait(&cond,&internal_mutex);
         BOOST_ASSERT(!res);
+        (void)res;
         this_thread::interruption_point();
     }