Issue installing doc tools on OSX

I had a problem installing the doc tools following the directions for
OSX at http://www.postgresql.org/docs/9.4/static/docguide-toolsets.html.
I'm running OSX Yosemite.

I got it to work by changing the command from:

sudo port install docbook-dsssl docbook-sgml-4.2 docbook-xml-4.2
docbook-xsl libxslt openjade opensp

To:

sudo port install docbook-dsssl docbook-sgml-4.2 docbook-xml-4.2
docbook-xsl libxslt opensp openjade

I didn't capture the error message unfortunately, but it was more or
less: unresolved dependency opensp while installing openjade.

Patch is attached.

--
- David Steele
david(at)pgmasters(dot)net