[SOLVED] "nano.specs: No such file or directory"

I used gcc-arm-none-eabi-5_4-2016q3 that was already on my machine under /usr/local
Then I updated my $PATH with

export PATH=/usr/local/gcc-arm-none-eabi-5_4-2016q3/bin:$PATH

and finally run

make clean &&  BOARD=PICO_R1_3 RELEASE=1 make

Now if I type source scripts/provision.sh PICO_R1_3 it just prints ARM. by calling make it then just tells me the same error with nano.specs

I don't really understand what I missed. Do you suggest to remove+reinstall the complete toolchain?