diff --git a/include/osgViewer/api/Win32/PixelBufferWin32 b/include/osgViewer/api/Win32/PixelBufferWin32
index d0771b50d..7a48dd9e5 100644
--- a/include/osgViewer/api/Win32/PixelBufferWin32
+++ b/include/osgViewer/api/Win32/PixelBufferWin32
@@ -54,6 +54,7 @@ class OSGVIEWER_EXPORT PixelBufferWin32 : public osgViewer::GraphicsWindow
 
         /** Make this graphics context current.*/
         virtual bool makeCurrentImplementation();
+        virtual bool makeContextCurrentImplementation( GraphicsContext* /*readContext*/ );
 
         /** Release the graphics context.*/
         virtual bool releaseContextImplementation();
@@ -69,6 +70,8 @@ class OSGVIEWER_EXPORT PixelBufferWin32 : public osgViewer::GraphicsWindow
         /** Get native OpenGL graphics context.*/        
         HGLRC getWGLContext() const { return _hglrc; }
         
+        virtual void bindPBufferToTextureImplementation( GLenum /*buffer*/ );
+        
     protected:
     
         void init();
diff --git a/src/osgViewer/PixelBufferWin32.cpp b/src/osgViewer/PixelBufferWin32.cpp
index b9d6aa096..a3a5387ed 100644
--- a/src/osgViewer/PixelBufferWin32.cpp
+++ b/src/osgViewer/PixelBufferWin32.cpp
@@ -57,11 +57,6 @@ PixelBufferWin32::~PixelBufferWin32()
 {
 }
     
-bool PixelBufferWin32::valid() const
-{
-    return _valid;
-}
-
 void PixelBufferWin32::init()
 {
     if (_initialized) return;
@@ -76,11 +71,6 @@ bool PixelBufferWin32::realizeImplementation()
     osg::notify(osg::NOTICE) << "PixelBufferWin32::realizeImplementation() not implemented." << std::endl; return false;
 }
 
-bool PixelBufferWin32::isRealizedImplementation() const
-{
-    osg::notify(osg::NOTICE) << "PixelBufferWin32::isRealizedImplementation() not implemented." << std::endl; return false;
-}
-
 void PixelBufferWin32::closeImplementation()
 {
     osg::notify(osg::NOTICE) << "PixelBufferWin32::closeImplementation() not implemented." << std::endl;