From 1c25078bc3aa9b91ef2bcc1307f1c21a6346cc6d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luk=C3=A1=C5=A1=20Hejl?= <hejl.lukas@gmail.com>
Date: Thu, 26 Aug 2021 08:41:11 +0200
Subject: [PATCH] Added a missing include (GCC 11.1).

---
 src/slic3r/GUI/Gizmos/GLGizmoSimplify.hpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/slic3r/GUI/Gizmos/GLGizmoSimplify.hpp b/src/slic3r/GUI/Gizmos/GLGizmoSimplify.hpp
index 04d4b99ab..1b25c4ac9 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoSimplify.hpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoSimplify.hpp
@@ -7,6 +7,7 @@
 #include "admesh/stl.h" // indexed_triangle_set
 #include <thread>
 #include <optional>
+#include <atomic>
 
 namespace Slic3r {