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-rw-r--r--src/buildtool/common/tree.hpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/buildtool/common/tree.hpp b/src/buildtool/common/tree.hpp
index 55922346..c861b264 100644
--- a/src/buildtool/common/tree.hpp
+++ b/src/buildtool/common/tree.hpp
@@ -15,6 +15,7 @@
#ifndef INCLUDED_SRC_BUILDTOOL_COMMON_TREE_HPP
#define INCLUDED_SRC_BUILDTOOL_COMMON_TREE_HPP
+#include <functional>
#include <memory>
#include <optional>
#include <string>