From e37a9ed213d7835daa279e7c413546dcc8f4ea1d Mon Sep 17 00:00:00 2001
From: Alexander Bock <alexander.bock@liu.se>
Date: Fri, 10 Feb 2023 08:59:40 +0100
Subject: [PATCH] Linux compile fix

---
 modules/skybrowser/include/wwtdatahandler.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/modules/skybrowser/include/wwtdatahandler.h b/modules/skybrowser/include/wwtdatahandler.h
index 2e1ce2f5ec..c6b1df682d 100644
--- a/modules/skybrowser/include/wwtdatahandler.h
+++ b/modules/skybrowser/include/wwtdatahandler.h
@@ -27,6 +27,7 @@
 
 #include <filesystem>
 #include <memory>
+#include <optional>
 
 namespace tinyxml2 { class XMLElement; }