From fba1045a992cf1726d3d83b59c98223e4f005989 Mon Sep 17 00:00:00 2001
From: Chris Perkins <chris.perkins@intel.com>
Date: Wed, 6 Jul 2022 10:11:55 -0700
Subject: [PATCH] PR6388 overlooked inclusion needed for windows

Signed-off-by: Chris Perkins <chris.perkins@intel.com>
---
 sycl/source/detail/event_impl.hpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sycl/source/detail/event_impl.hpp b/sycl/source/detail/event_impl.hpp
index f9ea6167943ba..1a6bf26dc9931 100644
--- a/sycl/source/detail/event_impl.hpp
+++ b/sycl/source/detail/event_impl.hpp
@@ -19,6 +19,7 @@
 #include <atomic>
 #include <cassert>
 #include <condition_variable>
+#include <optional>
 
 __SYCL_INLINE_NAMESPACE(cl) {
 namespace sycl {