From 09bad85522d6f9330c8b17246862e067510b4000 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Thu, 2 Jun 2016 14:30:58 +0100
Subject: [PATCH] Fixed method to match parent class.

---
 src/osgFX/SpecularHighlights.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/osgFX/SpecularHighlights.cpp b/src/osgFX/SpecularHighlights.cpp
index 2baba5b29..5b4092d73 100644
--- a/src/osgFX/SpecularHighlights.cpp
+++ b/src/osgFX/SpecularHighlights.cpp
@@ -105,7 +105,7 @@ namespace
         {
         }
 
-        virtual void getRequiredExtensions(std::vector<std::string>& extensions)
+        virtual void getRequiredExtensions(std::vector<std::string>& extensions) const
         {
             extensions.push_back("GL_ARB_texture_env_add");
         }