Easy steps to install cgns package on Mac
Package Information:
Application Name – cgns
What is cgns – Not Available for cgns
Use of cgns – CFD General Notation System
URL – http://cgns.org/
Installation Steps:
- Open Terminal using Spotlight search by pressing 
<command+space>. Type terminal and hitEnterkey. - Now, run following command to install homebrew (brew)
 - Install cgns using brew
brew install cgns
 

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null

cgns is ready to use now!