Install Kerberos 5 Add kerberos to the USE flag in /etc/make.conf. USE="kerberos" Then install everything: emerge -N world – Or – emerge mit-krb5 This will install the MIT kerberos 5 library which may be restricted under US export restrictions. The Heimdal krb5 implementation is free from those restrictions. You can install Heimdal by doing: emerge app-crypt/heimdal Because the kerberos install will change libgssapi, you will need to run revdep-rebuild to fix any apps that you build prior to install krb5.