Using #undef correctly?

[walt]

On Thu, 21 Sep 2006, Sascha Wildner wrote:

> The reason why your #undef didn't have an effect is that #undef is the
> counterpart to #define and the timezone prototype is just a normal prototype
> and not a #define'd preprocessor macro.

If my wife would answer a question as clearly as you, I would be much happier.
(Of course, she says the same about me!  But she's wrong...)