Print screen information provided by Qt.
cd <project_name_path>
mkdir build
cd build
cmake -DCMAKE_INSTALL_PREFIX=$KDEDIRS -DCMAKE_BUILD_TYPE=Debug ..
make
make install # or su -c 'make install' or sudo make install
where $KDEDIRS
points to your KDE installation prefix.
Note: you can use another build path. Then cd in your build dir and:
export KDE_SRC=path_to_your_src
cmake $KDE_SRC -DCMAKE_INSTALL_PREFIX=$KDEDIRS -DCMAKE_BUILD_TYPE=Debug