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svn diff ./pkg > patch_file_name

This is your patch file.

Now to check that it works fine, you could copy back the original
version of the function (for example from an svn checkout in a
temporary directory) and try if the patch works from the directory
where you have created it with

patch -p0 -i patch_file_name

Rerun the R CMD commands and recheck everything and you are ready to
submit the patch file to the community. Don't forget to describe what
you fixed (if possible including a bug number from the bug tracker)
and maybe give an example of the new/improved functionality.
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