Hi,
Yesterday I checked in a fix for the OS X 10.6.8 build problem. However, I used the emacs-25 branch, which is where active development should go after Fridays feature freeze. Please try it out and let me know if it works for you.
I'm 100% behind supporting 10.6.8. There are a number of Mac:s that can't be upgraded to newer OS X versions, but otherwise run perfectly fine.
However, there has been talk about dropping 10.5 and PowerPC support, but I haven't seen any definitive decision regarding this. I guess they will fall of the wagon once there are no developers actively supporting them. (Personally, I don't have access to a PowerPC machine, and wouldn't spend my free time supporting it anyway.)
-- Anders