Considering others also having problems converting
ooo-3.0 rpm packages on Slackware, you could try
the OOo_3.0.0_LinuxIntel_install_wJRE_en-US.tar.gz
from
http://download.openoffice.org/index.html
If you want a particular language, there are some
packages around.
Last resort is to convert the Debian package(s)
with # 'alien -t' to get '
.tgz' packages.
And they work.
....