I forgot to answer your question.
These were the commands I used to install GNU Radio along with gr-baz and OP25.

mkdir -p ~/sdr
cd ~/sdr
wget http://www.sbrac.org/files/build-gnuradio 
chmod a+x build-gnuradio 
./build-gnuradio --verbose

sudo apt-get install libitpp8 libitpp-dev libarmadillo-dev libcppunit-dev libpcap0.8 libpcap0.8-dev libarmadillo4

cd ~/sdr
git clone https://github.com/balint256/gr-baz.git
cd gr-baz
mkdir build
cd build 
cmake ..
make 
sudo make install
sudo ldconfig

cd ~/sdr
git clone https://github.com/balint256/op25
cd op25
mkdir build
cd build
cmake ..
make
sudo make install
sudo ldconfig