mac 10.5.8 does not work for this current version (1.6.1)

when i went to start minecraft (after downloading 1.6.1) it would say:
There is a bug in LWJGL which makes it incompatible with OSX 10.5.8

What I expected to happen was...:
i assumed it would start the game up like every other version

What actually happened was...:
after i downloaded it, it would not even bring up the jar. file.

Steps to Reproduce:
1. start the minecraft app
2. click on the play button (after it downloaded)
3. then the incompatible bug report shows up with out looking into the finder: There is a bug in LWJGL which makes it incompatible with OSX 10.5.8