Netgen on Mac

Netgen installation on Mac is hopeless.
It is better to use Ubuntu virtual machine or Windows laptop.

Netgen command line approach

This works for version 4.9 but does not for 5.3.1 (only GUI mode).

$  netgen -batchmode  -geofile=cone.geo -meshfile=cone.ng -coarse

$  netgen -batchmode  -geofile=cone.geo -meshfile=cone.ngn  -meshfiletype="Neutral Format"

The possible mesh size options are
-verycoarse
-coarse
-moderate
-fine
-veryfine