cd xgraph-12.2/
rm -f depcomp
ln -s /usr/share/automake-<version>/depcomp
./configure
make
make install
tar xvf ns-allinone-2.35_gcc5.tar.gz
cd ns-allinone-2.35/
./install
cd nam-1.15/
make install
// 'make install' will copy the executable 'nam' to /usr/local/bin/