FWIW - this is how I changed things to implement an "execute only once"
idiom within a target:
<target name="common-build-init" description="Set common build
properties">
<!--
Check if we've been here before...
-->
<ifnot propertyexists="build.init">
<!--
DO ONE TIME ONLY STUFF HERE
-->
<!--
Create a property (or set a known property to
true) to prevent re-execution
-->
<property name="build.init" value="true"/>
</ifnot>
</target>
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