update to the latest xcode this provides compilers. | http://developer.apple.com/technology/Xcode.html

also [2009.12.15 16:01:14] xcode 3.2.1 only works with 10.6 3.1.4 is the last one that works with leopard 10.5 also [2009.12.15 16:53:36] Note that Xcode lives in: /Developer/Applications/Xcode (not in main Applications directory)