thanks to this links, i succeed in having OpenVPN 2.0 work with my zaurus slc3000:
there you'll find all necessary packages
i just had to install libgcc found here :
then i created a static key on my windows server running openvpn2.0 , transfered it to the zaurus, created all config.ovpn on server and client side (thanks to many many people;) then i launched it.
and it works !
now i've access to my server samba shares via vpn on a "secured" 443 port
if interested i would post a little howto