create gist index

I have installed a Postgresql 7.32 and a Postgis 0.7.3 on a Suse 8.0 and I have a problem when I try to create a GIST index

CREATE INDEX indx_cname
ON roads_geom
USING GIST ( geom_colum GIST_GEOMETRY_OPS );

I got the following error:

ERROR: DefineIndex: operator class "gist_geometry_ops" not supported by access method "gist"

Do you have any idea??? I musy update the PostgreSQL with any patch?¿?¿?

Thank a lot.

Best Regards.