I compiled (on Fatdog 810b) a slackbuild for "odt2txt" which is a utility for converting open/libre office documents to plain text
odt2txt-0.5-x86_64-1_SBo.tgz
https://slackbuilds.org/repository/14.0/office/odt2txt/
**Modified to use newer soruce
I'm testing out various tools that can convert documents (mostly office documents) to text (see post) for purposes of indexing (see post) and searching my file system. This is one such tool.
Useful links:
https://linux.die.net/man/1/odt2txt