Could you explain how?
Most people who know how to modify the source knows C, and modifying a source is like like a tree with branches.
Once you modify one you have to go modify another, but thats only for some.
But for flags it's pretty simple. Just download the latest SVN and modify the flags you want to change and compile.
If you do not know how to do that, you might want to look up some tutorials on how to patch and compile.
From there play around with the source.
If you can't do that then you are SOL. Better off you don't worry about changing the flags at all.
