From Paul Melis, "Here is a list of fixes to misspelled APIs. Unfortunately, more than one

of these are public APIs and therefore will break linkage to existing
shared libraries."

Note from Robert Osfield, updated wrappers.

include/osg/BufferObject

@@ -159,7 +159,7 @@ class OSG_EXPORT BufferObject : public Object
 
             void lowestCommonDenominator(const Extensions& rhs);
 
-            void setupGLExtenions(unsigned int contextID);
+            void setupGLExtensions(unsigned int contextID);
 
             bool isBufferObjectSupported() const { return _glGenBuffers!=0; }
             bool isPBOSupported() const { return _isPBOSupported; }