Mac: OS X Lion(10.7) CS4/CS5/CS5.5

Hi all,

I have currently a plugin that I build it on my Mac with OSX 10.6(Snow Leopard) and I can build it for 3 versions of CS including: CS4/CS5/CS5.5. Now I have to cach up with some of other Mac development stuff and need to upgrade to Lion and Xcode 4.1, Any idea/ thoughts on this case to be able to keep my old stuff (specially CS4) still compileable? I know I can have different version of Xcode on the same partition but not sure with pgrading to Lion what would be the restriction/losing with my situation?

Thanks,

Kamran