Tested on Ubuntu 18.04.3 and macOS 10.15 Catalina with an RTL820T2 SDR.
1.
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sudo apt update
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sudo apt install rtl_sdr netcat sox gqrx
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git clone https://github.com/EliasOenal/multimon-ng.git
4. To build multimon-ng, follow these instructuctions, you will need make installed.
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mkdir build
cd build
cmake ..
make
sudo make install
6. Attach your SDR and make sure GQRX is getting data, then tune to your intended paging frequency.
7. Click the UDP button, located near the bottom right of the GQRX window.
You'll want to set the Filter Width to about 11k and the mode to NFM, don't enable any noise blankers or AGC.
8. Launch the terminal and paste
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nc -l -u localhost 7355 | sox -t raw -esigned-integer -b 16 -r 48000 - -esigned-integer -b 16 -r 22050 -t raw - | multimon-ng -t raw -a POCSAG512 -a POCSAG1200 -a POCSAG2400 -f alpha -
You may need to adjust some of the reciever settings to get a good signal, but it should work fine.