Which specific subversion of IRIX 6.5? I'm not sure when SSH was added.
The original 6.5.0 does not seem to have it; by 6.5.30 it was included
with the base system.
For all of 6.5.x it was also available on the SGI "Freeware" CDs (disk
3, specifically) as fw_openssh with slightly different prerequisites and
At this point, I don't know which version is more up-to-date, but either
will be at least 15 years old since that's how long IRIX has been
You might be better off getting a newer version (although probably still
out of date) from one of the IRIX enthusiast community efforts.
Nekoware was popular but is now defunct. Its OpenSSH package can still
be found at http://ftp.irixnet.org/nekoware/current/
Beware that you'll
also need to download and install its dependencies manually.
My best advice is to join one of the IRIX community web forums and ask
is the one I use. It gets a lot
more traffic than this newsgroup. There is also https://forums.sgi.sh/
but I'm not very familiar with that site. Either one is more likely to
be of more help than the newsgroups these days, sadly.