[plt-scheme] Is there a MacOS 10.5 (Leopard) version of DrScheme?

I'm creating some software for my students, which I'd like to distribute as
stand-alone executables. Unfortunately, the version I built on MacOS 10.4
(Tiger) won't run on MacOS 10.5 (Leopard).

So, what I'd like to know is whether there's a version of DrScheme for
Leopard, or if I can just run the MacOS X version on the download page under
Leopard and build a stand-alone executable with it which will run on a
Leopard machine?

thanks,
Alex