openVPN

Hi,

I'm trying to get openVPN to work on my ultra 2 but with "apt-get install openvpn" i got the message " Couldn't find package openvpn".

I downloaded it (openVPN 2.3.4, ) myself but when I try to ./configure (with SSH command line) i got the message:
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... no
checking for mawk... mawk
checking whether make sets $(MAKE)... no
checking whether make supports nested variables... no
checking build system type... x86_64-unknown-linux-gnu
checking host system type... x86_64-unknown-linux-gnu
checking for style of include used by make... none
checking for gcc... no
checking for cc... no
checking for cl.exe... no
configure: error: in `/root/openvpn-2.3.4':
configure: error: no acceptable C compiler found in $PATH

The OS that's installed is:
Linux version 2.6.37.6.RNx86_64.2.4 (jmaggard@calzone) (gcc version 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)) #1 SMP Tue Nov 12 18:53:39 PST 2013

That's why I used as "oscodename" the "etch" command (for debian v4):
echo "deb http://swupdate.openvpn.net/apt etch main" > /etc/apt/sources.list.d/swupdate.openvpn.net.list

Am I using the right version? Can anybody help me install openVPN?
If openVPN isn't supported, which VPN can I use that is easy to install on my readynas ultra 2?

Thanks,
Best regards,
Job