Compiling using Xcode
From OdaWiki
Opening the project
You can open "odamex.xcodeproj" with Xcode (development environment distributed with Apple's OSX). Right click on one of the targets to build/run it.
Required frameworks
You will need to make sure the following frameworks are installed:
Cocoa.framework (comes with OSX) Carbon.framework (comes with OSX) SDL.framework SDL_mixer.framework