From f2a2fc29383cdd8d2f567cf1a7aaccbf8e8f1841 Mon Sep 17 00:00:00 2001
From: Arne Morten Kvarving <arne.morten.kvarving@sintef.no>
Date: Wed, 22 Nov 2023 13:18:56 +0100
Subject: [PATCH] add missing include

---
 opm/simulators/linalg/DILU.hpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/opm/simulators/linalg/DILU.hpp b/opm/simulators/linalg/DILU.hpp
index 2874ad927..09007ce60 100644
--- a/opm/simulators/linalg/DILU.hpp
+++ b/opm/simulators/linalg/DILU.hpp
@@ -29,6 +29,7 @@
 #include <opm/simulators/linalg/GraphColoring.hpp>
 
 #include <cstddef>
+#include <optional>
 #include <vector>
 
 #if HAVE_OPENMP