#define in 'user-defined' section of target build settings, is not defined when xcode compiles code

Question

I have a project, using the current version of Xcode and llvm.
I am doing a free and paid version of a game, so I have set up a preprocessor flag to do it.

For the paid version target I define PAID_VERSION = 1 (in the "User-Defined" section of Build Settings)

When I compile however the PAID_VERSION keeps coming up with undefined.
So my #ifndef and #ifdef directives build the free version of the app.

I have looked around Stack Overflow and Google and found no hints as to what is going on here.

Answer 1

In the Other C Flags section add -DPAID_VERSION=1

This will define PAID_VERSION as 1, equivalent to #define PAID_VERSION 1 in code.