These are rough install directions for OpenSSH 3.7.1p2-chroot
Built on OSR 5.0.7 with prngd 0.9.27 and sco built-in openssl
You need "make" to install, easiest way is to install gnutools
or at least make from skunkware (see setup_gnu)

remove existing ssh:
On OSR 5.0.7:
  cp /etc/prngd /etc/rc.prngd.507
  custom -r SCO:ssh

On OSR 5.0.6 or less:
Remove ssh.
You could have any of several different versions installed in any of several different ways, so you'll have to manage this yourself.

prngd:
On 5.0.6 or less, If you already have prngd, such as from skunkware, then the new openssh should work with it.
On 5.0.7, removing ssh also removes prngd, so we have to replace it...
wget -q -O - http://www.aljex.com/bkw/sco/prngd-0.9.27.tar.bz2 |bzcat |tar xvf -
mv prngd-0.9.27/prngd /etc/in.prngd
cp /etc/rc.prngd.507 /etc/prngd

on 5.0.6 and earlier (including 5.0.4) if you just copy /etc/prngd and /etc/prngd.conf from a 5.0.7 box, that works

start the new prngd:
/etc/prngd start

openssh:
grep -q "^sshd:" /etc/passwd || useradd sshd
strip >dev/null 2>&1 || ln -s /bin/true /usr/bin/strip
wget -q -O - http://www.aljex.com/bkw/sco/openssh-3.7.1p2-chroot.tar.bz2 |bzcat |tar xvf -
cd openssh-3.7.1p2-chroot
make install
ln -s /usr/sbin/sshd /etc/sshd

tcp stop
tcp start