[HOpenGL] vertexAttribPointer problem

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?