Because of my research project, I need to use geant4 to do simulation on protons.  I am a beginner in GEANT4 but I manage to install it on my MacBook.  Here just writing down the necessary procedures for future reference.

I am using a MacBook Pro Retina with 128 Gb harddisk.  Hence I need to clear up some space before I install Linux and GEANT4.  I recommend using some software like DaisyDisk to effectively find those large files that eat up all your space in you Mac.
https://daisydiskapp.com/

The procedure of running geant4 in your MacBook is very straight-forward and as follows (or possibly can do the same in Windows, haven’t test it yet though)

1. Download VMWare Fusion 8 (Don’t use virtualbox, You will see why later)
2. Download Ubuntu 14.04 (You can download the iso file from the official website)
3. Ubuntu 14.04 Setup
   1. https://www.engadget.com/2009/09/07/how-to-set-up-ubuntu-linux-on-a-mac-its-easy-and-free/
4. Pre-requisite for installing GEANT4
   1. build essential:
      1. sudo apt-get install build-essential