From 597382e989d9775fa24513b7aa4a89f79897cd86 Mon Sep 17 00:00:00 2001
From: Jonathan G Rennison <j.g.rennison@gmail.com>
Date: Mon, 4 Sep 2023 00:02:45 +0100
Subject: [PATCH] Build: Fix MacOS compilation

---
 src/os/macosx/macos.mm | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/os/macosx/macos.mm b/src/os/macosx/macos.mm
index 21f58341bd..7405d06df0 100644
--- a/src/os/macosx/macos.mm
+++ b/src/os/macosx/macos.mm
@@ -15,6 +15,7 @@
 #include "../../fileio_func.h"
 #include <pthread.h>
 #include <array>
+#include <optional>
 
 #define Rect  OTTDRect
 #define Point OTTDPoint