Tom Yager noted after posting this column online: I made a couple of statements in my recent "Ahead of the Curve" blog that Apple asked me to correct. First, contrary to my claim that the iPhone SDK is the first time that Apple has released a public preview editions of Xcode in the past, Apple claims to have done so. Apple tells me that it is not incorporating FORTRAN into beta 3 of its iPhone SDK, a release that includes the newest stable build of the GNU Compiler Collection toolchain. MacOSForge lists FORTRAN as a default language in its distributions of gcc after v4.0, This accounted for my confusion. Note that while gcc 4.x will build for OS X, it is only supported informally by Apple, as are all Apple open source projects.