For other Unix systems you may have to [[
Build from source]].
Building from source on OpenBSD takes a bit of work at the moment, see
[[Compiling on OpenBSD]] for more details.
There is a build server which [[Continuous Build|continuously builds]] Octave for Linux. You will find the latest tarball [http://hydra.nixos.org/job/gnu/octave-default/tarball/latest-finished here].