Easy steps to install cli11 package on Mac
Package Information:
Application Name – cli11
What is cli11 – Not Available for cli11
Use of cli11 – Simple and intuitive command-line parser for C++11
URL – https://cliutils.github.io/CLI11/book/
Installation Steps:
- Open Terminal using Spotlight search by pressing 
<command+space>. Type terminal and hitEnterkey. - Now, run following command to install homebrew (brew)
 - Install cli11 using brew
brew install cli11
 

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

cli11 is ready to use now!