Dependencies
On Ubuntu, install the following:
sudo apt install libhackrf-dev
You also need to define your devices' serial numbers in src/main.cpp (use hackrf_info to find SNs)
char REF_DEVICE_SN[] = "FIRST_DEVICE_SERIAL_NUMBER";
char SURV_DEVICE_SN[] = "SECOND_DEVICE_SERIAL_NUMBER";
Then
mkdir build
cd build
cmake ..
make
./blah2-hackrf
Kudos to evilsocket - Simone Margaritelli, author of HackRFPP