Dear Charl,
Could you please post the output of: nest-config --prefix */usr* nest-config --datadir *share/nest*
I reinstalled the nest package and made sure there is no space in directory names. cmake -Dwith-python=3 -DCMAKE_INSTALL_PREFIX:PATH=/home/abolfazl/prog/nest-install /home/abolfazl/prog/nest-source
regards, Abolfazl