Cannot build docs on Ubuntu 10.04?

What packages and versions do I need to install to build the docs on Ubuntu?

I tried 10.04's version of Openjade, which wasn't recognized, and with
"jade" I got:

postgres(at)31214-1-950145:/usr/local/src/test$ make docs
make -C doc all
make[1]: Entering directory `/usr/local/src/test/doc'
make -C src all
make[2]: Entering directory `/usr/local/src/test/doc/src'
make -C sgml all
make[3]: Entering directory `/usr/local/src/test/doc/src/sgml'
jade -wall -wno-unused-param -wno-empty -wfully-tagged -D . -D . -d
stylesheet.dsl -t sgml -i output-html -V html-index postgres.sgml
jade:E: unknown warning type "fully-tagged"
jade:postgres.sgml:3:55:W: cannot generate system identifier for public
text "-//OASIS//DTD DocBook V4.2//EN"
jade:postgres.sgml:12:0:E: reference to entity "BOOK" for which no
system identifier could be generated
jade:postgres.sgml:3:0: entity was defined here

... and lots of other errors, eventually fatal.

Requirements for building the docs are not documented in our docs.

--
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com