Comment 2 for bug 386656

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John A Meinel (jameinel) wrote : Re: Diff options cause error on Windows

I would actually guess that we can't find 'diff.exe', it isn't a program that we bundle with the installer.

You could try doing "bzr diff --diff-option -w -Derror" and we can check the traceback.

I'm pretty sure you need to install diff separately (as you do on Ubuntu, but it is almost always there)
http://gnuwin32.sourceforge.net/packages/patch.htm

is one possibility, I think there are others.