compile to java 5 target bytecode, server side GWT(?)

Hi,
I need to deploy a gwt application on an infrastrutture running java5 jvm(s) :-(
I have read that, starting from gwt 2.5, gwt libs have been compiled with a java6 bytecode target.
My question is.. Has anyone tried to compile newer GWT versions (2.5,2.6,2.7), server side libs, with a java5 target bytecode?Is it possibile? Have you any suggestion-tip-walkthru?
Thanks in advance

Fabiano


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