What is “proj” Package?

PROJ.4, a Cartographic Projections Library
For more details: https://trac.osgeo.org/proj/

Installation

• Open Terminal by pressing command+space then type terminal and hit Enter key.
• Install homebrew first.

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

• Install proj.

  brew install proj

Now, use proj!