how to use tkdiff with subversion

to use tkdiff as the diff program with subversion, edit the subversion configuration file at * ~/.subversion/config * to comment out any

diff-cmd = /some/pathspec

and change it to (eg., on a mac with DarwinPorts):

# capella - use tkdiff. this path for a mac w/darwinports
diff-cmd = /opt/local/bin/tkdiff