You can start here:
http://www.geocities.com/rlcomp_1999/patch.html

On Mon, 05 Nov 2001, Austad, Jay wrote:

> Ok, I have 2 files, something.c and something-modified.c
> 
> How do I create a patch so the changes in something-modified.c can be
> applied to something.c?
> 
> Jay
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