I have an OpenGL and an OpenCL thread sharing a buffer and i assume i need this function to allow OpenGL to tell when OpenCL has finished with the buffer.
Digging around a bit, the Catalyst 10.8 driver doesn't seem to contain this ARB as far as i can tell. Maybe there is a rough timetable for support somewhere?
you must download and copy header file from khronos. http://www.opengl.org/registry/api/glext.h
this extension was introduced with OpenGL 4.1. current driver support only 4.0. so driver will support this extenion in the future.