Compiler not founf for SKR 2 board

I am trying to install klipper on a BTT SKR 2 board. Trying to compile the firmware does not work.
Base is a OcoPrint 1.7.0.
Error Message is:
pi@octopi:~/klipper $ make
Compiling out/src/sched.o
make: arm-none-eabi-gcc: Command not found
make: *** [Makefile:64: out/src/sched.o] Error 127
pi@octopi:~/klipper $ uname -a
Linux octopi 5.4.79-v7l+ #1373 SMP Mon Nov 23 13:27:40 GMT 2020 armv7l GNU/Linux
pi@octopi:~/klipper $
Thanks
Dieter

Most likely Klipper has not been installed correctly due to weirdness of the Rasbian Linux.

Run

sudo apt-get --allow-releaseinfo-change update
sudo apt-get dist-upgrade

then closely follow the information here: Installation - Klipper documentation

many thanks !!! Can compile the firmware