An installer script to compile SDR++ for RTL-SDR on the Raspberry Pi 4B with arm64. I found that 32bit RaspiOS is slower than 64bit one (although it's still not recommended for most of the applications).
It's based on the excellent SDR++ program by Alexandre Rouma, which can run on several platform, including Raspberry Pi. This version compiles on RPI 64 bit version.
(1) In your home directory, just create a sub-directory [RTL-SDR] and copy this shell script as your XXX.sh file.
(2) Change its mod: chmod +x XXX.sh
(3) run your shell script: ./XXX.sh
Hope it works for you as well.
Many thanks to Alexandre Rouma !! Please visit his page for more details: https://github.com/AlexandreRouma/SDRPlusPlus