Different set of libraries for the same project

Hi, I'm working on a plugin for Eclipse to write php (but I'm working on
it with Idea).
Since Eclipse exists in version 2, and the 3 in on the way,
I would like to compile this project for the two platforms. So I have to
compile it with the libs from Eclipse 2, and the libs from Eclipse 3.
Is it possible to do this without creating another project on the same
sources ?

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