Changes

or at the command-line when compiling the program:

Alternatively, the definition can be defined in Xcode by selecting the ''Project -> Edit Project Settings'' menu option. Within the settings dialog, select the ''Build'' option and change the ''Show'' menu to ''User Defined Settings''. This will display any currently defined user settings. Click on the gear button in the bottom left hand corner of the window and select ''Add User Defined Setting''.