Porteus

Porteus KIosk is compatible with OpenVPN?

If compatible... how can i add OpenVPN? I can't compile openvpn in Porteus Kiosk (dont have gcc~) ._./ have a module/way to compile in Porteus kiosk?

OpenVPN makes little sense in kiosk as you'll have to remember to update certificate before it expires.

Anyway - see here:
How to install software?

Do you have a xmz module for build/dev? with gcc, etc?
or a busybox with gcc?

You need to install Gentoo as explained in the thread i linked.