Create patches on Mac OS X

The UNIX utility diff is available on MacOS X. You need to open Terminal.app to access the shell. See HOWTO: Create patches for details on how to use diff or cvs diff.

You will need to download and install Xcode (free subscription required - look under "Developer Tools"). This will install diff, cvs, and a whole suite of Apple development tools. Alternative versions (not Xcode) of cvs are also available using Fink

Xcode also includes a GUI solution for creating patches in Apple's IDE.