Download the latest source code from one of the openssh.com mirrors.

Support for ssh version 1 was deprecated with version 8.0 . Make sure to read the release notes.

As of this writing, the latest ported version is 8.8.

Verify the integrity of the download by verifying its MD5/SHA1 checksum or gpg/pgp signature.

Explode openssh 8.8p1 source tarball with:

tar -xzvf openssh-8.8p1.tar.gz

The source code is unpacked into a newly created directory. Change to that directory

cd openssh-8.8p1

Now we need to create a makefile appropriate for our server. In our case, we want to install it in the default location that CentOS Linux uses, and enable some other useful features. (This should be a single line when entered in a bash shell.)

./configure –prefix=/usr –localstatedir=/var –sysconfdir=/etc/ssh –datadir=/usr/share –with-md5-passwords

Once that is done, compile the software:

make

Install it, overwriting any previously installed version:

make install

One last step that is useful on Gnome systems is to compile and install the Gnome/GTK2 passphrase requester. Gnome programs, such as gFTP, use this tool.

Change to the contrib directory:

cd contrib

build the requester using the command:

make gnome-ssh-askpass2

Lastly, as root, copy the resulting binary to /usr/bin

cp gnome-ssh-askpass2 /usr/bin