How GNURadio3.8.1 on RasperryPi4 ?

Dear radio friends,

Can anyone guide me (a rookie on HelloWorld level) how to install GNU Radio Campanion 3.8.1 on Rasperry Pi4?

If I follow the (currently) most recent RPi NOOBS 3.3.1 the installation guides fail (e.g. https://wiki.gnuradio.org/index.php/InstallingGRFromSource_on_Raspberry_Pi)

I'm searching for a few days now, but get stuck because the information I can find is only related to previous versions.

Thanks a lot for getting me and others rookies on track!

rrrRbert