diff --git a/examples/osgdelaunay/osgdelaunay.cpp b/examples/osgdelaunay/osgdelaunay.cpp
index ba9a48d9e..466d0a8d5 100644
--- a/examples/osgdelaunay/osgdelaunay.cpp
+++ b/examples/osgdelaunay/osgdelaunay.cpp
@@ -143,7 +143,7 @@ class LinearConstraint: public osgUtil::DelaunayConstraint {
 *  if 2 roads cross, then the overlap will be replaced by a 'cross road'
     *  and the roads built up to the cross roads with a texture along its length. */
 public:
-    LinearConstraint() : DelaunayConstraint(), txxrepAlong(10), txyrepAcross(10), width(2) { }
+    LinearConstraint() : osgUtil::DelaunayConstraint(), txxrepAlong(10), txyrepAcross(10), width(2) { }
     
     /** geometry creation parameters */
     /* Width of linear feature (eg road, railway) */
diff --git a/examples/osgdepthpartition/DepthPartitionNode.cpp b/examples/osgdepthpartition/DepthPartitionNode.cpp
index 0f3562622..3ffd472f8 100644
--- a/examples/osgdepthpartition/DepthPartitionNode.cpp
+++ b/examples/osgdepthpartition/DepthPartitionNode.cpp
@@ -1,7 +1,10 @@
 #include "DepthPartitionNode.h"
 #include <osgUtil/CullVisitor>
 
+using namespace osg;
+
 #define CURRENT_CLASS DepthPartitionNode
+
 CURRENT_CLASS::CURRENT_CLASS()
 {
     _distAccumulator = new DistanceAccumulator;
@@ -9,7 +12,7 @@ CURRENT_CLASS::CURRENT_CLASS()
 }
 
 CURRENT_CLASS::CURRENT_CLASS(const CURRENT_CLASS& dpn, const osg::CopyOp& copyop)
-    : Group(dpn, copyop),
+    : osg::Group(dpn, copyop),
           _active(dpn._active),
           _renderOrder(dpn._renderOrder),
           _clearColorBuffer(dpn._clearColorBuffer)
diff --git a/src/osgProducer/GraphicsContextImplementation.cpp b/src/osgProducer/GraphicsContextImplementation.cpp
index 0303bfb62..baa72c2e3 100644
--- a/src/osgProducer/GraphicsContextImplementation.cpp
+++ b/src/osgProducer/GraphicsContextImplementation.cpp
@@ -138,7 +138,7 @@ GraphicsContextImplementation::GraphicsContextImplementation(Traits* traits)
         }
         else
         {
-            getState()->setContextID( GraphicsContext::createNewContextID() );
+            getState()->setContextID( osg::GraphicsContext::createNewContextID() );
         }
         
         // but we share texture objects etc. so we also share the same contextID
@@ -150,7 +150,7 @@ GraphicsContextImplementation::GraphicsContextImplementation(Traits* traits)
     
         // need to do something here....    
         setState( new osg::State );
-        getState()->setContextID( GraphicsContext::createNewContextID() );
+        getState()->setContextID( osg::GraphicsContext::createNewContextID() );
 
         //_rs->realize();
     }
diff --git a/src/osgSim/OverlayNode.cpp b/src/osgSim/OverlayNode.cpp
index 929677cd7..39cdf2d9b 100644
--- a/src/osgSim/OverlayNode.cpp
+++ b/src/osgSim/OverlayNode.cpp
@@ -20,6 +20,7 @@
 #include <osgSim/OverlayNode>
 
 using namespace osgSim;
+using namespace osg;
 
 OverlayNode::OverlayNode():
     _texEnvMode(GL_DECAL),
@@ -31,7 +32,7 @@ OverlayNode::OverlayNode():
 }
 
 OverlayNode::OverlayNode(const OverlayNode& copy, const osg::CopyOp& copyop):
-    Group(copy,copyop),
+    osg::Group(copy,copyop),
     _overlaySubgraph(copy._overlaySubgraph),
     _texEnvMode(copy._texEnvMode),
     _textureUnit(copy._textureUnit),