ExpressVPN comes as either a deb or rpm package. We’ll choose the rpm package, so first install that.

sudo emerge rpm

Then you want to install the package without any dependencies.

sudo rpm -i --nodeps expressvpn-1.4.0-1.x86_64.rpm

ExpressVPN is now installed, but since Gentoo runs the OpenRC init system we’ll want to go ahead and create a service file in /etc/init.d/expressvpnd.

#!/sbin/openrc-run
command=/usr/sbin/expressvpnd
command_args=""
pidfile=/var/run/expressvpnd.pid
name="ExpressVPN Daemon"
command_background="yes"

depend() {
        # need net
        :
}

We need some more configuring.

ln -s /bin/ip /sbin/ip; modprobe tun

Then you can start the service as usual and add it to your runlevel default, and control the application using the Firefox extension available on the main website.