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Using GitHub

You need to create/own a GitHub account and fork the project allowing you to have an up-to-date copy of the source.
With a valid account, you can then assemble local tree changes and send to our tree as a pull request.
Please be clear in the comments and limit the amount of actual local tree commits made in order to create your updated code.

Using External .diff

To create a correct diff, use the following command line below. originaltree is the (src) directory of the original, unmodified sources; modifiedtree is the (src) directory of your updated sources; and patchname.diff is the name of the diff you want to create.

DIFF -Nru originaltree modiifiedtree > patchname.diff

Once you have a .diff containing your changes, ZIP it up and submit it by sending email