Hi, ALL, This is my first post here, so apologies if I break something... ;-) I am a Software Developer and recently I started working with Mac. I do have a Mac laptop (well my daughter does, I just borrowing) with Snow Leopard installed from the original CD. I did developed a program which successfully built and run on my Mac which has XCode 4.2 + SDK 10.6 and on one of my employer's Mac which has the same configuration. Apparently the Mac in the main office has Mac OSX 10.5 and the program didn't want to run. So I've been asked to recompile with SDK 10.5. The first thing I did is to check whether my original Snow Leopard disk contains such SDK. Apparently the only file it has is Mac10.6.pkg or something like this. So I went online however, it looks like this SDK is no longer available. Could somebody please tell me if this package is available and if yes, where can I get it. The developer I was working with is out of the country right now, but I want to try and solve this first without him. Thank you.