When trying to compile a kernel with LxNETES-2.3 toolchain, you might find several packages missing. Symptom: .. Command not found, when trying to compile project

# cd  project_digi_me
# source ./LxNET.sh
# ./prepare.sh
# make
..
make[2]: bison: Command not found
You need to install "bison" package, e.g. on Debian/Ubuntu enter:
# sudo apt-get install bison
# make
..
make[2]: flex: Command not found
# sudo apt-get install flex
# make
# make install-nfsroot