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-rw-r--r--include/clang/Frontend/ASTUnit.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/clang/Frontend/ASTUnit.h b/include/clang/Frontend/ASTUnit.h
index 232f9406be..f40e7aafc2 100644
--- a/include/clang/Frontend/ASTUnit.h
+++ b/include/clang/Frontend/ASTUnit.h
@@ -32,6 +32,7 @@
#include "llvm/Support/MD5.h"
#include <cassert>
#include <memory>
+#include <mutex>
#include <string>
#include <sys/types.h>
#include <utility>