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-rw-r--r--libcxx/include/stack1
1 files changed, 1 insertions, 0 deletions
diff --git a/libcxx/include/stack b/libcxx/include/stack
index 7b08d57da152..2abbcd025c4a 100644
--- a/libcxx/include/stack
+++ b/libcxx/include/stack
@@ -362,6 +362,7 @@ struct _LIBCPP_TEMPLATE_VIS uses_allocator<stack<_Tp, _Container>, _Alloc>
_LIBCPP_END_NAMESPACE_STD
#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+# include <concepts>
# include <functional>
#endif