Ubuntu Build Instructions
From Apache OpenOffice Wiki
Ubuntu 9.10 Karmic Koala and Ubuntu 10.04 Lucid Lynx
To build you need the following packages:
sudo apt-get install g++ gcc bison flex libarchive-zip-perl libcups2-dev libpam0g-dev \ sun-java6-jdk gperf libfreetype6-dev libxaw7-dev libfontconfig1-dev libxrandr-dev patch \ libgconf2-dev libgnomevfs2-dev ant libgtk2.0-dev junit
For the sun jdk you must activate the "ubuntu lucid partner" archive in the software sources.
Then you can build OOo with ./configure --with-use-shell=bash --disable-mozilla
For other options regarding mozilla code please see here.
In case you want to get some libraries from the system instead of building them yourself, the following packages are candidates to be installed also:
sudo apt-get install python-dev ccache libgraphite-dev \ libwpd8-dev libxslt-dev libdb4.7-dev libneon27-dev libhunspell-dev libaltlinuxhyph-dev
Then follow the Building Guide to continue.