General and Solaris instructions here: Toby's Memestreams

(Most of the rest pulled from user toby's instructions as well)

Download latest lzo library from http://www.oberhumer.com/opensource/lzo/download/

# cd lzo-2.02
# ./configure
# make install

Download latest openvpn 2.0.x from http://openvpn.net/download.html

# cd openvpn-2.0.8
# ./configure
# make install

Download & install tun driver: http://www-user.rhrk.uni-kl.de/~nissler/tuntap/

Create openvpn client config directory and copy 5 supplied files into it (substitute the right names for your cert and key files):

# mkdir -p /etc/openvpn/
# mv ca.crt ta.key local.conf mypc-vpnclient.* /etc/openvpn/
# cd /etc/openvpn/
# chmod 400 ta.key mypc-vpnclient.key.pem
# chmod 444 ca.crt mypc-vpnclient.cert.pem
# chown -R root:wheel .

(Note the two private key files are confidential)

To connect:

# /usr/local/sbin/openvpn --config /etc/openvpn/local.conf --daemon

To disconnect:

# kill `cat /var/run/openvpn.pid`
or
# killall openvpn

To set openvpn to init on boot, do this:

http://openvpn.net/archive/openvpn-users/2005-12/msg00424.html

The second string in that example is the path to the config file. The other paths are to the directory that file and the keys reside in.