From 2e47d7315ec19b1cf17be15a0dea484301b72342 Mon Sep 17 00:00:00 2001
From: Bastien Nocera <hadess@hadess.net>
Date: Tue, 12 Aug 2025 19:32:46 +0200
Subject: [PATCH] FIX: Fix missing std::optional declaration
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src/slic3r/GUI/DeviceCore/DevExtruderSystem.h:136:10: error: ‘optional’ in namespace ‘std’ does not name a template type
  136 |     std::optional<DevExtder> GetCurrentExtder() const;
      |          ^~~~~~~~

(cherry picked from commit 3c67563639a6c99955e16ac8e5b4042e64b07b73)
---
 src/slic3r/GUI/DeviceCore/DevExtruderSystem.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/slic3r/GUI/DeviceCore/DevExtruderSystem.h b/src/slic3r/GUI/DeviceCore/DevExtruderSystem.h
index 1f7ca6bd84..d0f7c105da 100644
--- a/src/slic3r/GUI/DeviceCore/DevExtruderSystem.h
+++ b/src/slic3r/GUI/DeviceCore/DevExtruderSystem.h
@@ -1,4 +1,5 @@
 #pragma once
+#include <optional>
 #include "libslic3r/CommonDefs.hpp"
 
 #include "slic3r/Utils/json_diff.hpp"