Get the sources

Create a directory that will hold the NEURON system and move to it. For concreteness for the remaining instructions suppose you want it to be /usr/local/neuron. Then:
mkdir /usr/local/neuron
cd  /usr/local/neuron
Get the neuron tar file:
Download nrnoc (2MB)

Extract the sources:

tar xf nrn3*tar
If you got the sources by ftp or if the tar files remained in the compressed form then use:
zcat nrn3*tar.Z | tar xf -