Install Process

Followed the README as is. Since I am working on CentOS release 6.5  I had to install a newer version of cmake from its source code and configured it in path

cmake install

wget http://www.cmake.org/files/v3.0/cmake-3.0.1.tar.gz
tar -xvzf cmake-3.0.1.tar.gz
cd cmake-3.0.1
./configure --prefix=~/CMAKEBIN
gmake
make install
vi ~/.bashrc

# Add the following:
# export PATH=~/CMAKEBIN/bin:$PATH
source ~/.bashrc

Installing okular

su -
yum install kdegraphics.x86_64

deal.II install

Followed the README file and video tutorial Obtaining and installing deal.II. 

cd deal.II
mkdir build
cd build
cmake -DCMAKE_INSTALL_PREFIX=~/deal.IIInstall ..
make install

Once installed I have the following folders in the install directory

Test Example

cd ~/deal.IIInstall/examples/step-1
cmake -DDEAL_II_DIR=../ .
make

make run
okular grid-2.eps