WO with XCode -- use another Java Version?

Hi,

I recently upgraded my development machine including the latest Java  
update (1.5 I believe). WO work fine on my machine. For deployment,  
however, I have machines that I cannot upgrade Tiger and / or Java  
1.5 in the near term. Anything I compile for those machines now won't  
run (of course).

Is there a way to set XCode to build on Java 1.4 (short of changing  
the symbolic links pointing to the java files on my development box  
to point back to 1.4)?

Mike