Installing the Shrew Soft VPN Client: CentOS

Step #1
Download the package from http://www.shrew.net/download/ike

Downloads> tar -xzvf ike-2.1.7-release.tgz

Step #2
Install the dependencies

Install CheckInstall
in Terminal

wget ftp://ftp.pbone.net/mirror/ftp5.gwdg.de/pub/opensuse/repositories/home:/ikoinoba/CentOS_CentOS-6/x86_64/checkinstall-1.6.2-3.el6.1.x86_64.rpm

rpm -i checkinstall-1.6.2-3.el6.1.x86_64.rpm

sudo yum install bison

sudo yum install gcc-c++

sudo yum install cmake

sudo yum install -y ncurses-devel

cmake -DQTGUI=YES -DETCDIR=/etc -DNATT=YES

sudo checkinstall

sudo ldconfig

sudo cp /etc/iked.conf.sample /etc/iked.conf

Step #3

Launch IKE

sudo iked

References: 
http://www.gta.com/downloads/external/53/General/ShrewSoftVPN_LinuxInstall.pdf
https://myubu.wordpress.com/2013/05/06/install-shrew-soft-vpn-client-on-ubuntu-13-04/