GWT maps 2.x version issue

When I trying to define another version in script tag than 2 (for
example 2.0) my gwt compiled code doesn't work. It only displays map
without my overlays and controls.
I need to define 2.0 version because of 2nd version of google maps
doesn't work properly with overlays in Opera browser.
Has anybody some workaround for version definition in this case?
Thanks.

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