Tool used for svn diff

Hi,
 
What are the tool used to prepare diff in Chora for Subversion ?
 
Is it diff, rcsdiff, svn diff ?
 
I ask this question because my human readable diffs prepared with Chora
always show "- No Viewable Change -" even if there is.
 
I wonder if I put the correct "Paths and Locations" in the Version
Control Setup.  On that screen, which are the binaries used for a
Subversion repository ?
 
Also, If I use the "Diffs to version x" hyperlink, I get this message
Index:
BUS_PKB_0202_MAJ.pkb===================================================================/usr/bin/diff:
illegal option -- -usage: diff [-bitw] [-c | -e | -f | -h | -n | -u]
file1 file2       diff [-bitw] [-C number | -U number] file1 file2      
diff [-bitw] [-D string] file1 file2       diff [-bitw] [-c | -e | -f |
-h | -n | -u] [-l] [-r] [-s] [-S name] directory1 directory2svn:
'/usr/bin/diff' returned 
 
Thank you


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