From 6a1c75e5eef8ab44b4aa23d9381e287ade9b4cab Mon Sep 17 00:00:00 2001
From: tamasmeszaros <meszaros.q@gmail.com>
Date: Thu, 15 Jul 2021 10:18:03 +0200
Subject: [PATCH] Fix build with gcc11

---
 src/libslic3r/Optimize/Optimizer.hpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/libslic3r/Optimize/Optimizer.hpp b/src/libslic3r/Optimize/Optimizer.hpp
index 05191eba2..8ae55c61c 100644
--- a/src/libslic3r/Optimize/Optimizer.hpp
+++ b/src/libslic3r/Optimize/Optimizer.hpp
@@ -8,6 +8,7 @@
 #include <functional>
 #include <limits>
 #include <cassert>
+#include <optional>
 
 namespace Slic3r { namespace opt {