promise.patch

diff --git a/hpx/lcos/detail/promise_base.hpp b/hpx/lcos/detail/promise_base.hpp                                                                                                                                                                                                  
index 46235cdcea..0369598320 100644                                                                                                                                                                                                                                               
--- a/hpx/lcos/detail/promise_base.hpp                                                                                                                                                                                                                                            
+++ b/hpx/lcos/detail/promise_base.hpp                                                                                                                                                                                                                                            
@@ -47,6 +47,13 @@ namespace lcos {                                                                                                                                                                                                                                               
                 f_ = std::move(f);                                                                                                                                                                                                                                               
             }                                                                                                                                                                                                                                                                    
                                                                                                                                                                                                                                                                                  
+            virtual future_status                                                                                                                                                                                                                                                
+            wait_until(util::steady_clock::time_point const& abs_time,                                                                                                                                                                                                           
+                error_code& ec = throws)                                                                                                                                                                                                                                         
+            {                                                                                                                                                                                                                                                                    
+                return this->future_data<Result>::wait_until(abs_time, ec);                                                                                                                                                                                                      
+            }                                                                                                                                                                                                                                                                    
+                                                                                                                                                                                                                                                                                 
         private:                                                                                                                                                                                                                                                                 
             void do_run()                                                                                                                                                                                                                                                        
             {