Installing the CVS HOpenGL in a ghc 6.2.1 distribution

Hello,
I am getting a strange bug while using automatic texture generation,
the specification of a plane for eye linear generation will sometimes fail
depending on wether or not I call an unrelated function before, which
doesn't even contain calls to OpenGL functions.
It was working properly under the old API, and the new API bindings of the
texture generation functions seem correct to me, so I thought maybe the
compiler itself was at fault, but when I try to install the HOpenGL
package inside my ghc 6.2.1 distribution, it complains about mismatched
interface file versions upon building (since the HOpenGL .hi files are
6.3). Is there a way around this ? Does that mean I should rebuild the
HOpenGL .hi files using ghc 6.2.1 ?
Thank you for your help,

	Yann Morvan