yum install kernel-headers kernel-devel gcc make python-devel openssl-devel kernel-devel, graphviz kernel-debug-devel automake rpm-build redhat-rpm-config libtool git
cd /root/
wget http://ftp.gnu.org/gnu/autoconf/autoconf-2.64.tar.gz
tar xvf autoconf-2.64.tar.gz
cd autoconf-2.64/
./configure
make
make install
cd /root/
wget http://openvswitch.org/releases/openvswitch-2.3.1.tar.gz -O /root/openvswitch-2.3.1.tar.gz
mkdir /root/rpmbuild/SOURCES
cp /root/openvswitch-2.3.1.tar.gz /root/rpmbuild/SOURCES/
rpmbuild -bb rhel/openvswitch.spec
rpmbuild -bb rhel/openvswitch-kmod-rhel6.specrpm -ivh /root/rpmbuild/RPMS/*.rpm
You can also use our public repo here for cloudstack.
http://mirror.beyondhosting.net/Cloudstack/