From 5dd905fc8c171debd39ce0943d69ccc9e39dabda Mon Sep 17 00:00:00 2001
From: Lukas Matena <lukasmatena@seznam.cz>
Date: Tue, 14 Sep 2021 22:56:29 +0200
Subject: [PATCH] Added a forward declaration needed on GCC 9.4.0

---
 src/slic3r/GUI/GLModel.hpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/slic3r/GUI/GLModel.hpp b/src/slic3r/GUI/GLModel.hpp
index 1258da1cb6..f2fc9da9b3 100644
--- a/src/slic3r/GUI/GLModel.hpp
+++ b/src/slic3r/GUI/GLModel.hpp
@@ -6,6 +6,8 @@
 #include <vector>
 #include <string>
 
+struct indexed_triangle_set;
+
 namespace Slic3r {
 
 class TriangleMesh;