svn diff: choosing the number of context lines

Hi,

Is there a way to choose the number of context lines in "svn diff"?
I've tried "svn diff -U5" for instance, but I get:

svn: invalid option character: U

though "man diff" says:

       -u -U NUM --unified[=NUM]
              Output NUM (default 3) lines of unified context.

-- 
Vincent Lefèvre <vincent_at_vinc17.org> - Web: <http://www.vinc17.org/> - 100%
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Work: CR INRIA - computer arithmetic / SPACES project at LORIA
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