Why Nvidia remove glVertexWeightPointerEXT from 53 drivers

OpenGL OpenGL: Advanced Coding
1

Guys from Nvidia help me please
on linux 53.28 drivers I got undefined reference to glVertexWeightPointerEXT while linking my prog.
on 44.96 work fine

2

read this: http://www.opengl.org/discussion_boards/ubb/Forum3/HTML/010663.html

3

Thanx