What version should I get? If you target Mac OS X 10.5 (Leopard) and up, or need to develop 64- bit applications, we recommend using the Cocoa package. If you target earlier versions of Mac OS X, you need to use the Carbon package. For more configuration options, download and build Qt from source. Carbon: Mac binary package for Mac OS X 10.4 - 10.6 (32-bit Intel/PPC) http://get.qt.nokia.com/qt/sou