what i think is there are many other vpn which better than open vpn like i a using FastestVPN: https://fastestvpn.com/buy-vpn
Linux Mint 17 needed to install from: http://community.linuxmint.com/software/view/network-manager-openvpn-gnome also.
Happy user of OpenVPN on W7 and therefore installed it on Linux Mint. However, to make OpenVPN appear in the VPN Connections => Network Connections GUI, install also the Network Manager http://community.linuxmint.com/software/view/network-manager-openvpn-gnome
Leaving this compile at 2.2 or 2.1 - rather than 2.3.x - introduces serious security issues; also prevents current openssl libraries from being used. Not good, at all.