Assuming external software is installed in /usr/local/bin/,

Boost was already installed :  boost: /usr/include/boost
if boost not found use yum to install.
 1) yum install boost

cmake must be installed:
 1) download latest cmake
 2) check out the README.rst
 3) run ./bootstrap && make && make install
 4) add the following to your .bashrc    

    PATH=/usr/local/cmake/bin:$PATH
    export PATH
Then run: 
    source ~user/.bashrc
    echo $PATH // to check if cmake in the PATH.
    cmake --version // to check if the version is right, should be cmake version lastest version


install g++ 4.7 (since CentOS is a bit behind on this)

    use:
 1) cd /etc/yum.repos.d
 2) wget http://people.centos.org/tru/devtools/devtools.repo 
 3) yum --enablerepo=testing-devtools-6 install devtoolset-1.0

 4) export PATH=/opt/centos/devtoolset-1.0/root/usr/bin/:$PATH
    (might as well add this to .bashrc )


To install sdsl-lite:
git clone https://github.com/simongog/sdsl-lite.git

First got to the /sdsl-lite/external/libdivsufsort-2.0.1/
 1) read INSTALL
 2) run the command in the INSTALL file
    cmake -DCMAKE_BUILD_TYPE="Release" -DCMAKE_INSTALL_PREFIX="/usr/local" ..
    make
     make install   
 3) cd back up 
 4) run:  ./install.sh /usr/local
 
untar twin package 
 1) run make