From 5e63d3ded96c2a02544bc770681b42b9addb45dc Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Mon, 6 Aug 2018 10:16:18 +0200
Subject: [PATCH] fix build failure on Linux

---
 src/Mod/Mesh/Gui/SoFCIndexedFaceSet.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Mod/Mesh/Gui/SoFCIndexedFaceSet.cpp b/src/Mod/Mesh/Gui/SoFCIndexedFaceSet.cpp
index 7f401e15ba..b3174a0b2c 100644
--- a/src/Mod/Mesh/Gui/SoFCIndexedFaceSet.cpp
+++ b/src/Mod/Mesh/Gui/SoFCIndexedFaceSet.cpp
@@ -23,6 +23,10 @@
 
 #include "PreCompiled.h"
 
+#ifndef FC_OS_WIN32
+#define GL_GLEXT_PROTOTYPES
+#endif
+
 #ifndef _PreComp_
 # include <algorithm>
 # ifdef FC_OS_MACOSX