[HOpenGL] vertexAttribPointer problem

[Ben Christy]

using vertexAttribPointer results in error "user error (unknown OpenGL
extension entry glVertexAttribIPointer, check for OpenGL 3.1)"

the exact code was:
 vertexAttribPointer (AttribLocation 1) $= (KeepIntegral,
(VertexArrayDescriptor 3 Float ((4) *10) (plusPtr nullPtr (0*4))))

according to
version ←  get (majorMinor glVersion)
The version is 2.0
The OpenGl Spec states that vertexAttribPointer was added in version 2.0 so
I am not certain of the problem any thoughts?
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