try to not upset clang with useless cleanups

diff --git a/include/xbt/functional.hpp b/include/xbt/functional.hpp
index d6c6b2b..ca034ba 100644 (file)
--- a/include/xbt/functional.hpp
+++ b/include/xbt/functional.hpp
@@ -15,6 +15,8 @@
 #include <exception>
 #include <functional>
 #include <memory>
+#include <string>
+#include <tuple>
 #include <type_traits>
 #include <utility>
 #include <vector>