merging svn and nonsvn copies

I have a project (say P) that I manage under subversion. For the project I
also collaborate with another person (say X). X does not use subversion.

So I end up
1) making a "svn export" when my part is complete, give it to X (in
a .tar.gz format).
2) X makes some changes and gives it back to me.
3) I unzip the new tar.gz directory
4) copy it by rsync to my working copy
5) then commit the changes to the repository from working copy

I am wondering if there is an svn way of doing step 4. Here I am essentially
merging changes between an svn copy, and a nonsvn copy. Can this be done by
svn? I looked in svn merge's help but there both initial arguments have to
subversioned directories.

Any ideas?

thanks
raju

-- 
Kamaraju S Kusumanchi
http://www.people.cornell.edu/pages/kk288/
http://malayamaarutham.blogspot.com/
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