svn diff --diff-cmd and unknown diff options

The diff command used in svn diff --diff-cmd doesn't necessarily have
the same options as GNU diff. When using svn diff --diff-cmd docdiff,
I got:

Index: contents/research/extended.en.xml
===================================================================
docdiff: ambiguous option: -L

There should be an option to remove the options normally used by
Subversion.

Note: I'm using svn, version 1.0.5 (r9954).

-- 
Vincent Lefèvre <vincent_at_vinc17.org> - Web: <http://www.vinc17.org/>
100% validated (X)HTML - Acorn / RISC OS / ARM, free software, YP17,
Championnat International des Jeux Mathématiques et Logiques, etc.
Work: CR INRIA - computer arithmetic / SPACES project at LORIA
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