xampp - php - install intl pecl extension on MAC (OSX)

Magento 2 (M2) require this extension of php for installation.
On window, just enable php_intl.dll but on MAC, it may be more difficult than i think :)

1. Check which php path
user$ which php

2. If you are using xampp on mac it should be
/Applications/XAMPP/xamppfiles/bin/php
but if its
/usr/bin/php
you need to change your OSx php

user$ PATH="/Applications/XAMPP/xamppfiles/bin:${PATH}"

user$ php -v

PHP 5.6.24 (cli) (built: Aug 26 2016 05:57:56) 

Copyright (c) 1997-2016 The PHP Group

Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies

user$ which php

/Applications/XAMPP/xamppfiles/bin/php

3. Install brew

user$ ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

4. Install icu4c
user$: brew install icu4c

5. Install autoconf

user$  brew install autoconf

6. Install Intl via PECL
user$ cd <your xampp path>/bin
user$ sudo ./pecl update-channels
user$ sudo ./pecl install intl

7. You can check if Intl was installed successfully
user$ cd <your xampp path>/bin
user$ ./php -m | grep intl  

# it return 'intl'