Configure to use WITH_DEBUG

[White Hat]

I have a system that I am setting up that will only be used to test programs. I therefore want all programs built with debug code. To facilitate that task, I was wondering if I could put a global flag in the '/etc/make.conf' file. Assuming that would work, which of these is the better solution.
 
1)    WITH_DEBUG
2)    WITH_DEBUG=1
3)    WITH_DEBUG=true
4)    -DWITH_DEBUG
 
If there is a better solution, I would appreciate hearing about it.
 
Thanks!

-- 
White Hat 
pigskin_referee at yahoo.com

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