--- /dev/null
+/* A thread pool (C++ version). */
+
+/* Copyright (c) 2004-2023 The SimGrid Team. All rights reserved. */
+
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
+#ifndef XBT_SUBSETS_HPP
+#define XBT_SUBSETS_HPP
+
+#include <functional>
+#include <unordered_set>
+#include <vector>
+
+namespace simgrid::xbt {
+
+} // namespace simgrid::xbt
+
+#endif