From b14cc673bccea422f2d8bba516d3ee8457734c59 Mon Sep 17 00:00:00 2001
From: "florent.teppe" <florent.teppe@nadeo.com>
Date: Fri, 12 Aug 2022 18:47:29 +0200
Subject: [PATCH] adds missing decleration

---
 components/shader/shadermanager.hpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/components/shader/shadermanager.hpp b/components/shader/shadermanager.hpp
index 8aa299c73b..50c430637e 100644
--- a/components/shader/shadermanager.hpp
+++ b/components/shader/shadermanager.hpp
@@ -13,6 +13,10 @@
 #include <osg/Shader>
 #include <osg/Program>
 
+namespace osgViewer {
+    class Viewer;
+}
+
 namespace Shader
 {
     struct HotReloadManager;