sudo apt-get install curl vpnc-scripts build-essential libssl-dev libxml2-dev liblz4-dev gettext
wget ftp://ftp.infradead.org/pub/openconnect/openconnect-8.02.tar.gz
tar xzf openconnect-8.02.tar.gz
cd openconnect-8.02
./configure --without-gnutls --with-vpnc-script=/usr/share/vpnc-scripts/vpnc-script --without-openssl-version-check
make
sudo make install-strip
sudo ldconfig /usr/local/lib