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-rw-r--r--libcxx/include/mutex1
1 files changed, 1 insertions, 0 deletions
diff --git a/libcxx/include/mutex b/libcxx/include/mutex
index 52e39b0fb1f..9c55c7cc164 100644
--- a/libcxx/include/mutex
+++ b/libcxx/include/mutex
@@ -194,6 +194,7 @@ template<class Callable, class ...Args>
#ifndef _LIBCPP_CXX03_LANG
#include <tuple>
#endif
+#include <version>
#include <__threading_support>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)