Comment 3 for bug 862750

If you use echo as command you see the commandline:

$ svn -r1 diff --diff-cmd echo README.txt
Index: README.txt
===================================================================
-u -L README.txt (revision 1) -L README.txt (working copy) .svn/tmp/tempfile.tmp README.txt

and as I aready stumbled upon this problem recently on a Macintosh, a look into the svn book reveals, that always GNU diff options are used:
http://svnbook.red-bean.com/en/1.5/svn.advanced.externaldifftools.html

Although I dont know, why this worked until now. Maybe meld changed its behaviour?

A wrapper script as in the link can help. This script works for me here, save meldsvn.py in $PATH