OpenAFS is available as binary packages for most major Linux distributions. See your distribution's documentation for how to install software packages.

On RedHat systems and clones, like Scientific Linux,you need to install the following packages:

openafs-client openafs-krb5


On Debian systems and clones, including all variants of Ubuntu, your best bet is to install

openafs-client openafs-krb5 openafs-modules-dkms

The openafs-modules-dkms package will make your life easier whenever there is a new kernel version for your system.