Brew package manager , install from website
brew install gcc
brew install cmake
brew install git
brew install git-lfs
brew install gnupg
brew install zsh
brew install python
brew install sphinx-doc
brew install root
brew install geant4 --with-system-clhep --with-gdml --with-qt --without-example
CMAKE_PREFIX_PATH=/usr/local/opt/flex:/usr/local/opt/bison:$CMAKE_PREFIX_PATH cmake ../bdsim