# ubuntu 14.04
sudo apt install -y build-essential libssl-dev zlib1g-dev libpam0g-dev
./configure --prefix=/usr --sysconfdir=/etc/ssh --with-pam
make
sudo make installNote: don't worry, configuration files under /etc/ssh will not be overwritten .
http://www.linuxfromscratch.org/blfs/view/cvs/postlfs/openssh.html