From 0e05c660025df6943c1c2a92cd613932486ccb07 Mon Sep 17 00:00:00 2001
From: Matti Kortelainen <matti.kortelainen@cern.ch>
Date: Tue, 18 Oct 2022 01:45:18 -0500
Subject: [PATCH] Add missing include

---
 FWCore/Framework/src/TransformerBase.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/FWCore/Framework/src/TransformerBase.cc b/FWCore/Framework/src/TransformerBase.cc
index ab8219e5fc011..dd06093b6212b 100644
--- a/FWCore/Framework/src/TransformerBase.cc
+++ b/FWCore/Framework/src/TransformerBase.cc
@@ -7,6 +7,8 @@
 #include "DataFormats/Provenance/interface/BranchDescription.h"
 #include "DataFormats/Provenance/interface/ModuleDescription.h"
 
+#include <optional>
+
 namespace edm {
   void TransformerBase::registerTransformImp(
       ProducerBase& iBase, EDPutToken iToken, const TypeID& id, std::string instanceName, TransformFunction iFunc) {