git clone -b edit https://github.com/jsqliu/okular/
cd okular
mkdir build
cd build
cmake -DCMAKE_INSTALL_PREFIX=/path/to/your/kde4/install/dir ..
make
make install

git clone -b edit https://github.com/jsqliu/okular/
cd okular && cd build && cmake -DCMAKE_INSTALL_PREFIX=$HOME/install/ .. && make
make install

1) In "~/.bashrc" added:
export KDEDIRS=$KDEDIRS:$HOME/install:$(kde4-config --prefix); kbuildsycoca4

2) In "~/.profile" added (which is my separate installation folder) Note. Running two different versions of Okular
is so far unsuccessful.:

# set PATH so it includes user's private bin if it exists
if [ -d "$HOME/bin" ] ; then
    PATH="$HOME/bin:$HOME/install/bin:$PATH"
fi

3) In /etc/environment

export PKG_CONFIG_PATH=/where/install/poppler/lib/pkgconfig:$PKG_CONFIG_PATH
export LD_LIBRARY_PATH=/where/install/poppler/lib:$LD_LIBRARY_PAT