[s4u] Add missing include

diff --git a/include/simgrid/s4u/conditionVariable.hpp b/include/simgrid/s4u/conditionVariable.hpp
index ec9823d..f279016 100644 (file)
--- a/include/simgrid/s4u/conditionVariable.hpp
+++ b/include/simgrid/s4u/conditionVariable.hpp
@@ -6,8 +6,10 @@
 #ifndef SIMGRID_S4U_COND_VARIABLE_HPP
 #define SIMGRID_S4U_COND_VARIABLE_HPP
 
-#include <simgrid/s4u/mutex.hpp>
+#include <utility> // std::swap
 
+#include <simgrid/simix.h>
+#include <simgrid/s4u/mutex.hpp>
 
 namespace simgrid {
 namespace s4u {