two versions of lilypond on same machine

[Sean Reed]

hi.

might anyone have a suggestion as to how to install two separate 
versions of lilypond (the current stable and the current unstable) on 
the same machine, and then be able to decide which version to run?

i would like to keep a copy of the newest stable and the newest 
unstable versions on my computer, so that i can follow and try out and 
contribute to the development of the unstable updates, while still 
being sure that if a change in an unstable update somehow negatively 
alters the output of my page that i can go compile my page using the 
current stable, without having to uninstall the current unstable and 
reinstall the current stable versions.

i'm on a mac with OS 10.3.5, and have been using fink to install 
lilypond, but can switch to a manual install from sources if need be.

thanks for any hints,
sean

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Sean Reed
Web: www.seanreed.de