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-rw-r--r--clang/lib/Parse/ParseOpenMP.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/lib/Parse/ParseOpenMP.cpp b/clang/lib/Parse/ParseOpenMP.cpp
index 680cae705fcc..b5e6d011ecd6 100644
--- a/clang/lib/Parse/ParseOpenMP.cpp
+++ b/clang/lib/Parse/ParseOpenMP.cpp
@@ -25,6 +25,7 @@
#include "llvm/ADT/UniqueVector.h"
#include "llvm/Frontend/OpenMP/OMPAssume.h"
#include "llvm/Frontend/OpenMP/OMPContext.h"
+#include <optional>
using namespace clang;
using namespace llvm::omp;