A property can't be defined conditionally, so you must define it yourself if you want to use it and GWT did not define it already.
The only way to get the GWT version as a binding property is to first write a linker that publishes the GWT version in the generated JS code and then write a <property-provider> JS snippet in the GWT xml to read that published GWT version from JS. But that makes you dependent on the linker and thats something you probably don't want. It also forces any user of your GWT module to use exactly that linker or modify their linker to also publish the GWT version to JS. Not so great.
Personally I would try providing two my-lib.gwt.xml files. One for GWT 2.6+ and one for earlier versions. Well truth to be told, I simply wouldn't support older versions. Anyways, developers can then inherit the file they need based on the GWT version they use.
-- J.
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