https://www.accellera.org/downloads/standards/systemc
if [[ ! -d "$SYSTEMC_INCLUDE" ]]; then
export SYSTEMC_INCLUDE="/usr/local/systemc-2.3.2/include/"
echo 'export SYSTEMC_INCLUDE="/usr/local/systemc-2.3.2/include/"' >> ~/.bashrc
export SYSTEMC_LIBDIR="/usr/local/systemc-2.3.2/lib-linux64/"
echo 'export SYSTEMC_LIBDIR="/usr/local/systemc-2.3.2/lib-linux64/"' >> ~/.bashrc
fi