[O] ditaa on Mac OS X

[SabreWolfy]

This[1] ditaa example with ORg 8.2.7f under Mac OS X Mavericks fails with a
message indicating that .../elpa/contrib/scripts/ditaa.jar is not found. I
created the folder and soft-linked /usr/local/bin/ditaa to ditaa.jar and
tried again. This time the export ran, but the PDF it created contained a
large box with ":file somefile_name.png" inside it. I've also read this[2]
and did not find ditaa in ELPA. Suggestions?

[1] http://doc.norang.ca/org-mode.html#playingwithditaa
[2] http://orgmode.org/worg/org-contrib/babel/languages/ob-doc-ditaa.html